Garden

Scab on potatoes: causes and methods of treatment

Scab can manifest itself in several forms:

  1. Common. This form of the disease occurs most often. The causative agent of this type of disease feels great in the soils of lime composition, as well as in high humidity. Often ordinary scab appears in the ground, rich in organic matter, so fertilizer should be alternated. It is easy to determine the presence of scab, as it manifests itself by small but noticeable ulcers, which gradually increase and turn into a "plug" on the surface of the tuber. Despite its prevalence, the ordinary form affects not all varieties of vegetables. The most resistant to the emergence of the disease - "Berlichingen", "Priekulsky" and "Cameras". It is possible to defeat the disease by adding additional ones to the standard care procedures. Before eliminating scab, a preventive effect on tubers must be made. To do this, it is enough to spray them with Nitrafen or Polycarbacin. Effectively germinating seedlings in the light. Wet plants should be immediately after its deepening in the ground. It is necessary to complete the watering procedure after the stem reaches a width of 1.5 - 2 centimeters.
  2. Powdery. This form is common in waterlogged soil. Clots of microorganism can move in the soil and reach the plant root. The main sign of the presence of this type of scab - gray "warts" on the tubers. In the areas of lesion the skin is cracking, which contributes to the spread of the disease. Practically not subject to such a disease "Lorch", "Yubel", "Cardinal" and "Majestic." Powder form usually attacks the root system of a crop and its stem. Tubers also undergo late blight and dry rot. Seedlings before transplanting should be maintained in a formalin solution for 7 minutes. After that, young plants cover with a tarpaulin for several hours.
  3. Silvery. This form is manifested by the appearance of brown spots on the tubers or the formation of small zones of “black soot”. After some time, the root skin peels off, and the stain becomes gray. The mushroom pathogen multiplies in conditions of high humidity and warm (about 21 °). Ailment adversely affects yield. Affected root crops are reduced in size even under storage conditions. During this period, spots of gray mold may appear at the site of the wart. Most often, the disease is exposed to cultures growing in loamy and sandy soils. Before planting, the tubers should be etched. Chemical processing of potatoes should be carried out after harvesting before storage. For this purpose, usually used "Nitrafen", "Botran", "Titusim" and other chemicals.
  4. Black This form of the disease is also called rhizoctoniosis. The pathogen develops with high moisture. He usually attacks the culture when the spring is late and very wet. Dark deep spots that are difficult to remove from the surface of tubers are a sign of rhizoctoniosis. the danger of this type of scab, it is able to attack the potato during its germination. Such a seedling dies or develops with an affected stele and “twisted” upper sheets. "Loves" the microorganism, the causative agent of loam. This potato disease is dangerous because there are no varieties resistant to it. Therefore, prevention should pay particular attention. It is necessary to pickle the tubers with Integral, Baktofit, Vivatax and a number of other means. Crop sprouts should be buried 0.07 meters in the sandstone, up to 0.11 meters in loams and 0.12 meters in peat soils. In addition, it is necessary to plant young sprouts to a permanent place in a heated land (about 8 °).Mineral and organic supplements of rhizoctoniosis are warned in more than the recommended amount.

Methods of prevention and treatment

Different forms of scab have different fungal pathogens, but the result of their activity is one. If there are no signs of ailment on your site, this does not mean that it will not manifest itself in the next year or in a year. Therefore, the fight against the disease includes both treatment and prevention.

For a start, you should pay attention to the planting material of potatoes and its seedlings. For landing you need to choose healthy individuals. Before planting, the tubers are treated with special preparations.

If in the planting material there are slightly affected individuals, then during flowering the culture must be actively watered.

If copper, manganese and boron are used during planting, then the probability of tuber damage by scab will significantly decrease.

Potato scab will visit your crop less often if you change the place of planting of potatoes annually and alternate it with the place of planting of legumes. If the territory does not allow frequent changes of landing sites, then at least refrain from fertilizing the land with fresh manure.

If the land in your area is alkaline, acidify it with a solution of ammonium sulfate (2 tablespoons per bucket of water). During flowering each bush will require half a liter of solution.

Two weeks before the harvest, it is worth destroying all the green parts of the plant, because such actions will help the potato skin to get stronger.

After collecting the fruits, it is advisable to plant the territory with sideratami. They will help the earth to "bounce back" and saturate it with useful substances. Sideratami can be cereals (wheat or rye), legumes (peas, lupins) or cruciferous (rape, mustard) plants.

In addition, it is necessary to monitor the condition of the premises in which the crop is stored. There should not be high humidity and heat.

Zircon will help slow the spread of the disease. Most often it is used during the formation of buds on the plant. Zircon perfectly regulates growth. Even its application can significantly increase the yield.

Scab on potatoes how to fight? To reduce the prevalence of the disease and the extent of the damage to potatoes, you can apply the drug "Fitoplus". They are processed planting material. A solution of the drug is usually sprayed culture during its growing season. For 3 liters of water, one chemical bag is enough.

Highly resistant varieties

If all preventive operations do not give the expected result, you need to change the potato variety. Absolutely scab-resistant varieties of vegetables are not, but there are those that offer active resistance to the disease.

Domestic representatives: Bryansk New, Ramensky, Varmas, Herald, Vilnia, Vyatka, Favorite, Prasna, Spring, Skoroplodny and several others. Varieties bred abroad: Alpha, Element, Krostotr, Ostara, Prevalent, Saturn.

No need to neglect prevention when growing varieties that are highly resistant to scab. After all, only then the harvest will be tasty, rich and healthy. In addition, be sure to consider the conditions of growth of crops, as well as the soil composition.

How to deal with scab potatoes

Scabbed potatoes lose about 30% of starch, their taste is made worse, and they are stored much less time. Since the diseased potato is in the ground, it is impossible to immediately notice and cure the disease when the potato grows. Because of this, it is very important to carry out activities for the prevention of the disease.

Scab - a disease caused by a fungus, usually more often affects the tubers, sometimes the roots and part of the stem, which is underground.

Scab on potatoes are divided into 4 forms: ordinary, silver, powdery and rhizoctoniosis (black scab).

Ordinary

For her, a favorable environment is alkaline or calcareous soil, which has a lack of moisture, while the air temperature is 25-30 gralus.

The spores of the fungus penetrate the tuber through cracks in the peel. When storing the potatoes, they do not become infected, since the pathogens are in a state of rest under adverse conditions, but they do not die.

Common scab mainly falls on potatoes that have a scarlet or thin skin. If you plant potatoes deeply in the ground, water intensively with the growth of tubers, then the risk of getting sick decreases.

Symptoms: visible on the tuber crops hard ulcers of irregular shape, ulcers can cover the whole potato, or cracks are visible on the sore spots on the peel.

Silvery

It often appears when potatoes are planted in sandy loam and loam, the optimum air temperature for the disease is 18–20 degrees, and the humidity is increased — 85–100%.

The fungus enters the tuber crops through the ground, then moves to the other potatoes. The difference of this form from others - diseased tubers do not rot in storage, but only lose moisture.

Symptoms: the skin is wrinkled, silver appears on the affected areas, especially brightly it is visible on the grades having a scarlet peel. Gradually brownish gray spots grow, sometimes they look depressed.

Sick potatoes barely germinate and the harvest is low.

She is most commonIt is a fungal pathogen that can move. The disease occurs on tuber crops, roots and the underground part of the stem.

When placed in storage, sick potatoes dry, but if the environment is excessive humidity, the potato rots. Often on diseased potatoes, late blight and dry rot are added to the scab.

Sources - land, diseased seed potatoes and manure (when feeding livestock to diseased potatoes, fungal spores do not lose activity even after passing through the digestion of a cow). The disease occurs in heavy land with excess water, at a temperature of 12-18 degrees.

Symptoms: whitish growths visible on the rootshaving a diverse shape, they are gradually made brown. On a sick tuber visible warts, a variety of spots. After some time, the diseased areas dry up, after the ulcers burst and appear, the gray-brown substance is visible in them - spores. More potatoes rot.

Rhizoctoniosis (black scab)

It can hit potatoes with high humidity and air temperature of 17 degrees, if there is often precipitation in the spring, and cold weather. Crop losses from black scab - 20—25%.

Symptoms: black spots on the tuber cropsresembling the ground, they can not be washed off the tubers and difficult to scrape, but they do not harm the tubers. Sick bushes during the day wither, grow low, they have twisted leaves. If it rains and it is warm, then a “white leg” is visible on the stem.

Scab - a disease arising from the fungus.

  • Astonished land.
  • Sick tuber crops, on which the disease is not visible, but there is a fungus, since during the initial spread it is not visible.
  • Excess nitrogen in the soil stimulates the development of scab.
  • If you plant potatoes in one place from year to year, then diseases will accumulate in the ground.
  • High ground temperature.
  • Land having acidic properties.
  • Soil fertilizer before planting potatoes fresh manure.

Maksim - This is a contact fungicide. Killing the fungus, Maxim preserves the beneficial microflora of the earth. 4 ml of Maxim are added in 0.05-0.1 l of water. Use, processing 10 kg of tubers.

Drug Maxim - an effective remedy for scab

To get rid of the disease, tuber crops are sprayed before planting:

  • 13 g Agata25K is added to 1 l of water, this composition is enough for 100 kg of potatoes,
  • 10 g of Fitosporin M is dissolved in 5 liters of water, use this rate for 20 kg of tubers,
  • 10 drops of Krezacin drip in 2 liters of water, use this composition per 40 kg potatoes.

Phytosporin sprayed bushes 3 times per season, in 1 package of drug add 3 l of water, then sprayed.

They take 25-50 grams of Kuprosat, add water to the ten-liter bucket, spray the bushes.The second time the bushes are treated 10 days later, but no later than 20 days before digging out the bushes.

Shrubs are also sprayed with drugs. Albit, Colfugo, Acrobat MC, Mancozeb, Profit Gold, Fenoram Super, Ordan.

This is done 2-4 times per vegetative season, as written in the instructions.

Mancozeb - Chinese development for spraying bushes from scab Ordan - Russian fungicide

  • For planting take away absolutely healthy tubers. Handle the tubers before planting with special formulations.
  • Every year, change the place of planting potatoes, plant potatoes after beans, peas, beans. Do not use fresh manure as a fertilizer.
  • If you have an alkaline soil, then make it more acidic by adding a solution of 2 tbsp. spoons of ammonium sulfate in a ten-liter bucket of water and spilling the area. When flowering under one bush pour 0.5 liters of solution.
  • 14 days before digging potatoes mow the tops.
  • The room for storing potatoes should be dry and cool.

Alena - an early variety resistant to scab Grade Snow White - medium early, not exposed to infection

  • Alyona - early variety. Tubers are oval, they have scarlet skin and snow-white flesh. Potatoes are resistant to scab, cancer, drought. But not resistant to late blight, it will have to fight.
  • Snow White - medium early variety. Good and long stored. It has resistance to scab and late blight. Oval tubers have yellowish peel and snow-white flesh, tiny eyes.
  • Resource - mid-season. Resistant to drought and heat. Almost not subject to viral diseases, scab. Resistant to mechanical damage. Tubers are oval with beige-skinned.
  • Lasock (Lasunak) - medium late, launched in Belarus. He has excellent taste, high yield. Resistant to scab, it almost does not hit the Colorado potato beetle.
  • Pace - late. Large, rounded-flat in shape with a creamy shade of skin and creamy hue of flesh, it tastes great. Resistant to scab.

In order for the potatoes not to be affected by scab, it is worth picking up for planting special varieties that are resistant to this disease, and also not to neglect prevention.

Scab on potatoes: causes and methods of treatment

Scab on potatoes is a fungal disease that affects tubers. Pathogens can be in the soil for a long time, and they enter the vegetable through pores or small wounds. Just want to say that the infected root can be eaten, but the damaged part is cut and thrown away.

The risk of scab is that the commodity and taste of the vegetable are reduced, the level of vitamins, minerals and amino acids. If the loss of nutrients is 35% -40%, then the yield is reduced by half (in some cases the loss reaches 60% -65%).

Favorable conditions for the development of the disease

Like any ailment, scab occurs in certain cases. Among them are the following:

- pH of the soil is 6.1 - 7.4, that is, the reaction is slightly alkaline.

- Air temperature 24 ° С - 29 ° С.

- Soil moisture - in the range of 50-70%.

- When making lime and wood ash.

- When fertilizing the soil with manure. The danger lies in the fact that in the fight against scab spoiled tubers are often used for feeding livestock. Given that the microorganisms are very stable, they pass through the digestive tract of the animal and go along with its excrement. Soil fertilization with such manure can cause additional contamination.

- With an excess of nitrogenous fertilizers and calcium.

- With a lack of soil boron and manganese.

Preventive measures to prevent scab

It is best to immediately create and try to maintain the conditions under which the pathogens of the disease will be uncomfortable. But if you still notice small bulging warts on the tubers, be sure to find out how to get rid of potato scab. There are general tips for gardeners who can minimize the risk of developing the disease:

  • Inspect planting material thoroughly. Choose large tubers weighing 75-100 g, pre-treated with a solution of boric acid (10 g per 9 liters of water).
  • Deep sowing of root vegetables also reduces the risk of scab.
  • After harvesting, it is necessary to collect all residues (spoiled tubers, roots, stems) and destroy them.
  • The place of planting potatoes must be changed, periodically sown after it legumes, which enrich the soil with nitrogen and disinfect it. It is possible to return the tuber culture to its former place in 4-5 years.
  • Check soil acidity (pH should not exceed 6.0). Otherwise, the crop can attack the scab of potatoes. Treatment with chemical agents does not produce results, but it is not difficult to reduce the risk of infection. It is possible to regulate the pH by the application of mineral fertilizers (superphosphate) under the tubers. Follow the watering schedule. The introduction of lime is relevant only in the case when the pH of the soil is below 4.9. It is useful to mulch potatoes with fallen pine needles, to make sulfur (2.1 - 3.2 kg per hundred parts) or gypsum (15-20 kg per hundred parts).

These are just general recommendations. It is important for gardeners to know that there is a different scab on potatoes. The methods of struggle and the conditions of development may differ slightly, but in general the rules for eliminating the problem are the same.

This type of disease is more common. The causative agent is Streptomyces scabies. It develops well in sandy and calcareous soils, in conditions of high humidity and large doses of organic matter. Onset of the disease is easy to diagnose by small ulcers, which gradually grow and eventually become covered with a corky bloom.

Common scab on potato does not occur in all varieties. “Berlichingen” and “Priekulsky” as well as “Kamerz” have the strongest immunity to the disease.

Along with the general rules of planting and caring for the culture there are a few additions. Before temkak get rid of potato scab, spend preventive treatment of tubers - sprinkle them with means "Nitrafen" or "Polikarbatsin."

The germination of planting material in the light helps to combat the disease very effectively. Watering the culture begins immediately after deepening into the soil and continue until the stem of the plant increases to 1.5-2 cm in thickness.

Powdery scab

The causative agent is Spongospora subterranea. Develops in too wet soil. Moreover, pathogen lumps can independently mix in the ground and reach the roots. Such a scab on potato in the form of warts light gray.

Tuber skin cracks at the site of infection, the disease spreads further. It is believed that varieties such as "lorch", "jubilee", "cardinal" and "majestic" are practically not affected by the disease.

This disease of the potato - parshaporoshistaya - affects the roots and stem. Tubers are susceptible to additional late blight infection and the appearance of dry rot. Planting material before sowing is kept in a solution of 40% formalin (proportion: 1: 200) for 6-7 minutes, then covered with a tarp for a couple of hours.

Silver scab

First, brown spots or small patches resembling black soot appear on the tubers. After the peeling of the skin of the potato stain becomes a gray tint.

The causative agent is Helminthosporium solani mushroom, which multiplies rapidly at a temperature of 19-21 ° C and humidity of 90-95%.

The disease is dangerous because the yield drops sharply. Affected tubers continue to lose weight even during storage, and gray rot may appear at the site of the wart.

Harvest yields on loamy and sandy soils are more susceptible to ailment. Before planting, the tubers are etched.

Processing is also carried out immediately after harvesting before putting it into storage, using drugs such as Nitrafen, Botran, Fundazol, Celeste, or Titusim.

Risoctoniosis, or black scab

The causative agent is Rhizoctonia solani. Develops in conditions of high humidity.As a rule, infection occurs when the spring is late and rainy. Manifested in the form of dark in-depth spots or sclerotia, which are hardly scraped off the surface.

Black scab on potato is dangerous because it can strike a tuber at the germination stage. Such shoots either perish or appear on the surface with a defeat of the stem and twisted upper leaves. Best of all, the pathogen feels on loamy soils.

This is one of the most unpleasant options for the disease, since varieties resistant to it do not exist. In order not to show the black scab of potatoes, start treatment with the treatment of tubers with such bacterial preparations as Integral, Planriz or Baktofit, as well as with Fenoram, Vivataks or Maxim.

Planting depth: sandy soil - 7 cm, loamy - 8-11 cm, peat - 12-13 cm. Maintain average planting time when the soil warms up to + 8 ° С. Prevents the appearance of rhizoctoniosis, the application of mineral and organic fertilizers in doses slightly higher than recommended for this class.

Potato scab - control measures, scab treatment on potatoes - Gardener

Let's start with an analysis of the plot on which such potatoes are harvested: which varieties were previously grown there, where they came from and how they got to the garden bed. Most likely, with some regular planting material of the rootless variety, one type of this common potato disease has penetrated.

There are many varieties of potato scab, but the ways of spreading the infection are the same for all - planting tubers and soil from the site where infected plants were planted at least once. Potatoes could be successfully grown for many years in the same place, if pathogens did not settle in the soil.

Unfortunately, the soil with scab disputes is not so easy to cure.

1. Careful selection and processing of tubers

  • protection of tubers from pests and diseases
  • yield increase,
  • improvement of taste,
  • extension of storage periods.

Annually, for planting, select only healthy (at least in appearance) tubers and treat them with Prestige for preventive purposes.

Before the flowering period of the potato, it will protect the tubers from wireworm, crown and larvae, as well as a number of fungal diseases, including some species of scab and phytophthora.

But after the flowering of potatoes, the concentration of protective substances in the tissues of the plant becomes too small to stop pests and suppress diseases.

It is possible to reduce the risk of potato scab disease using EM technologies.

Thus, preplant treatment of tubers with biological preparations (especially in combination with regular watering) heals the soil well, increases crop yield, and also improves the taste and keeping quality of tubers during storage.

Apply this agripriem need annually. Pre-treatment with Topsin M and Fundazol also effectively reduces the incidence of scab potatoes.

2. The use of varieties of potatoes that are resistant to scab

Effect: the ability to grow a crop of healthy potatoes in the infected area.

If the soil in your garden is still infected with scab, and you have no other place for planting potatoes, it remains only to look for varieties resistant to scab. For example, Borodyansky pink, Vodogray, Kosen-95, Serpanok, Kupava, Dubravka, Desiree.

3. Follow the rules of growing potatoes

Effect: avoid conditions that contribute to the activation of the causative agent, prevent the development of the disease during the growing season.

Increased soil moisture contributes to the active spread of scab on potatoes, if at the same time disturbed soil aeration. Acidity is also an unfavorable factor: the higher this indicator is, the more active the causative agent is.

If the soil is rich in humus, the causative agent of common scab will not threaten it.Conversely, fresh organic fertilizer and undecomposed plant residues contribute to the development of the disease.

Crop rotation is a mandatory method of preventing scab on potatoes - it is undesirable to plant potatoes at the same place for several years in a row, because the soil has accumulated the spores of the causative agent and substances that contribute to its development.

At the same time, winter grain crops, siderats (soybean, vetch, canola, mustard) will become the best precursors for potatoes.

4. Properly harvesting potatoes

Effect: obtaining healthy tubers, with high rates of keeping quality and guaranteeing high-quality seed in the future.

First of all, get rid of the habit of digging up potatoes only when it is “fully ripe”. It is not necessary to wait when the completely dried tops of the crop fall on crests of potato plantings heated by the heat of summer. Over the summer, various diseases accumulate in its leaves and stems.

Therefore, as soon as the tops begin to turn yellow, it must be cut off and removed from the field or burned. And the tubers to dig up when the skin on them is still easily torn off. In this state, all the scratches and damage to the tubers heal easily and drag out during the week of storage in a dark, dry and warm place.

Before this, it is useful to dip them into the working solution of a protective biological product in order to protect them from probable diseases. After a week, it is advisable to wash the tubers from the adhering soil, dip into a protective solution of salicylic or benzoic acid (300 mg per 1 l of water) and dry in the shade.

This technique will eliminate a lot of external infection that happened to be on the tubers, and improve their keeping quality during winter storage.

The described methods of protection, as a rule, are used by adherents of the "classic" growing technologies.

Unfortunately, such methods also have a drawback: pests and pathogens that survived after processing potatoes with pesticides acquire immunity (resistance) to them, and the next time to get rid of them, the concentration of drugs will have to be increased. So can go on indefinitely.

In addition, in many cases, the decay products of pesticides accumulate in the fruits of plants. In other words, the use of chemicals is not the best way from the point of view of the ecological purity of the grown products.

5. Preventing scab on potatoes

Effect: protection of potatoes from scab and gradual cleansing of the soil from the causative agent of the disease

Among the safe methods of combating potato scab vegetables, agrotechnology called “Gumireaktor” has proven its effectiveness. It is able to solve most of the problems associated with the protection of potatoes and other plants during the growing season, as well as gradually clean the soil from pathogens.

Of course, for the treatment of infected soil will take some time.

Gumirektor - this is not an instant "switch" of all evil in the garden, but for several seasons of systematic use of this technology will ensure the environmental safety of plants grown, and also strengthen the friendly "team" of microorganisms that help the soil to be healthy.

Scab on potatoes how to fight?

Potatoes are still popular with gardeners and are growing in almost every sector. It happens that appears scab on potatoes how to fight With such a problem, we will look at the article. What kind of care is needed for potatoes?

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scab on potatoes how to fight

What is scab?

This is a fungal disease, the pathogens of which live for a long time in the ground and most often infect tubers through fine cracks. Sometimes the root system and even the stems are affected, but this rarely happens.

Affected tubers lose a third of the starch, their taste is much worse, the yield is reduced, and they are poorly stored. There are no scab resistant varieties. Therefore, it is important to carry out preventive measures.

Powdery scab

This species is quite common, especially in wet ground. Interestingly, the fungus in the form of a lump of mucus itself moves in the soil and finds tubers, infecting them and the root system of the plant. Affected potato shrinks during storage, and rots at high humidity.

Infected tubers have white growths, which then turn brown and burst, and in ulcers there is dust - spores of the fungus. Sowing material from such beds often suffers late blight and dry rot.

It is better to soak it in a formalin solution for 7 minutes before planting and then close it with a thick cloth for 4-6 hours.

The disease spreads through the soil, planting material and fresh manure. Spores spread well on moist, heavy soils. They live in soil for up to five years.

The varieties Yubel, Cardinal, Lorch, Majestic are not very susceptible to this disease.

Black scab

It is also called rhizoctoniosis. Spores are activated at high humidity, especially in late rainy spring. Pathogens attack a young plant. The infected stalk and the twisted upper leaves testify to the infection, during the day such a bush fades, it is small. In warm weather, the stem looks like a “white leg”. Most often the disease manifests itself on loams.

The disease is not resistant varieties of culture. It is necessary to pickle the planting tubers with the preparations Integral, Vivataks, Baktofit.

Fighting scabs is as follows:

- introduction of green manure into the soil

- tillage before planting superphosphate solution

- processing of potato tubers with formalin solution (50 ml of 40% formalin per 10 liters of water).

Silver scab

The silver scab of potatoes appears first as light brown, then as silvery spots of various shapes on the peel. Silver scab dries both tubers and tops. Tubers become soft and just simply fade.

The silver scab of potatoes spreads at a sufficiently high humidity (about 90%) and at a low air temperature (+3 degrees).

The spores of this disease can persist in tubers and in the soil for a very long time, since the silver scab is resistant to cold.

What is ordinary potato scab?

Common potato scab mainly affects varieties that have red or thin skin. The disease is rarely applied to the tops, root system and leaves. It looks like small or medium-sized spots in the form of small dimples, similar to ulcers.

The edge of these dimples has a dry rim. The color of the spots may be brown or dark yellow.

Favorable conditions for the development of common scab are shallow tubers, air access, insufficient capacity of boron and manganese in the soil. The prerequisites for the occurrence of potato disease are heat up to 30-350С and elevated soil temperature up to 270С. In this case, the pH of the soil should not exceed 5.5.

Spores of common scab can live in the soil for a long time. Getting on the potato, prerequisites are created for the penetration of rot into the spores. As a result, the potatoes begin to rot.

Treatment of ordinary potato scab should be carried out using the following methods:

  • Etching Before planting, it is necessary to treat the tubers with formalin solution with water in the proportion of 50 ml. 40% formalin per 10 liters. water.
  • Immediately before planting, it is necessary to treat the soil with a solution of superphosphate, potassium magnesium and ammonium sulfate (30 g / 1 m2).
  • Soil preparation is also carried out by planting siderats, in particular lupine.

The most resistant varieties to common scab: Weaving, Amber, Domodedovo, Zarechny.

Common scab

This type of disease is more common. The causative agent is Streptomyces scabies. It develops well in sandy and calcareous soils, in conditions of high humidity and large doses of organic matter.Onset of the disease is easy to diagnose by small ulcers, which gradually grow and eventually become covered with a corky bloom.

Ordinary scab on potatoes does not occur in all varieties. "Berlichingen" and "Priekulsky" as well as "Kamerz" have the strongest immunity to the disease.

Along with the general rules of planting and caring for the culture there are a few additions. Before you get rid of potato scab, spend preventive treatment of tubers - sprinkle them with "Nitrafen" or "Polycarbacin". The germination of planting material in the light helps to combat the disease very effectively. Watering the culture begins immediately after deepening into the soil and continue until the stem of the plant increases to 1.5-2 cm in thickness.

Diseases, causes

There are several species of scab, they differ in color, have characteristic features:

Ordinary, it appears when there is a lack of moisture, at an air temperature of 25 to 30 degrees. As a rule, in a lime or alkaline soil. This species cannot affect the tubers during storage, however, the fungus does not die, but remains dormant.

Subjects with a thin or pink skin are subject to infection.

  1. Powdery - a common type. Mucous fungus, capable of independent movement. Affected potato shrivels, but when the humidity increases, rotting begins, and the appearance of late blight may occur. The source of the disease may be contaminated land or organic fertilizers, since the parasite remains active even after passing through the animal's stomach. Manifested in heavy, extremely wet soils at a temperature of 12 to 18 degrees.
  2. Silvery, appears at very high humidity, on loamy or sandy soils. A characteristic feature is the absence of rotting. The root crop loses moisture, has a silvery shade, black formations appear under the peel, poorly cleaned.
  3. Rhizoctoniosis or black scab, the most dangerous lesion. It is difficult to recognize because the color of the damage coincides with the ground. The first symptoms will be faded stems with twisted leaves. Damage to the tuber is not washed off.

Disease prevention, control and treatment methods

It is impossible to get rid of malicious pathogens completely. It is necessary to create conditions under which they will not spread. The result is achieved with the observance of agronomic, biological and chemical methods of control. One of the most effective ways to prevent is to maintain crop rotation.. It is possible to plant potatoes on the place where it grew, not earlier than in three years. In the conditions of small areas there is no possibility to fulfill this rule Then come to the aid of green fertilizer - siderata.

After harvesting can be sown:

  • winter crops - rye or oats
  • cruciferous - mustard, rapeseed, oil radish,
  • legumes - clover, vetch, soy.

Of great importance for the prevention of disease, is the fertility of the soil. The constant combination of organic fertilizers and siderats increases the humus content in the soil. Thanks to him, plants receive a maximum of balanced nutrition and protection from disease. Another important rule is the treatment of planting material. Even if no damage is found, the tubers need to be sprayed with fungicides. For this purpose, use drugs:

  • "Phytoplus",
  • "Maxim 025 FS",
  • Fungazil 100 SL,
  • Aquaflo,
  • Rovral and others.

Tip # 1. If a scab has appeared, this soil signals that it cannot cope with the harmful flora, it needs additional food.

Fertilizers and root dressings, assessment of their productivity

To overcome the spread of scab can be a complex of mineral fertilizers. The sequence of application and the action of nutrients and protective substances:

  1. Optimization of soils with pH> 6.5, acidification method. Apply sulfates of potassium, magnesium, ammonium (read about the optimal parameters of the soil for planting potatoes).
  2. Before planting - a mixture of potassium magnesium, superphosphate and ammonium sulfate at 30 g / m 2.
  3. After planting - interrow spacing with 1% boric acid solution, at the rate of 4 l per 1 m 2.

Tip # 2.Note! Excessive acidification of the soil, which occurs as a result of the decomposition of salts, slows down the growth of potatoes and impairs the taste.

Scab treatment plan by day

Organic supplements do not harm the soil and the environment, unlike chemicals, salts of which can accumulate in the roots. The best results are brought by the complex use of organic and mineral substances.

1 kg per 100 m 2

Tip # 3. Note! Specific dates of fertilizer application depend on the time of maturation of potato varieties and are associated with vegetative periods.

Analysis of potato sprayers

  1. Forte OG-16 (40661) manual - pump design. Tank capacity - 16 liters. The model is equipped with a telescopic fishing rod and three nozzles for varying degrees of spraying. Gardeners have noticed the fragility of the body, in operation does not tolerate shocks.
  2. Sadko SPR-8 (8010079) manual. The size of the tank - 8 liters. Feature of the model - the pump, built into the cover, comes into action from a few light taps. As a disadvantage, gardeners have noted a small spraying radius of up to 50 cm.
  3. Lemira OP-202-01 pneumatic. The ten-liter fluid cylinder is equipped with a hose and a telescopic fishing rod. 4 nozzles spray the liquid from the spray to the fog. The weak side is called the piston seals of the pump, quickly fail them with intensive use.
  4. Solo 451-02 gasoline, knapsack. Capacity - 20 liters. Spraying reaches 11 m. Designed to handle large areas. Additional equipment - 4 nozzles for different degrees of dispersion. Some gardeners complain that with a full tank, shoulder straps cut into the hands and have to work when the tank is half full.
  5. Comfort (Good Girl) OE-10-N battery-powered - with a filler filter. Spraying is controlled by four nozzles and spreads over a long distance. The model is easy to operate, you need to pour liquid into a ten-liter tank and turn the toggle switch. The disadvantage is the high cost.

Potato Scab - Fighting Disease

Potatoes - one of the most popular and common crops in world agricultural production. In the people it is called the second bread. For many, it remained, remains, and will remain the main crop on the site.

With the development of new technologies of cultivation of vegetable crops, oddly enough, with each passing year it is becoming more and more difficult for us to grow the next crop. With the advent of new pesticides, pests and diseases are rampant with even greater force and aggressiveness in our fields.

Recently, common scab has spread among all potato diseases. The tubers struck by it lose all their taste and commodity qualities. 30 - 40% lost starch content. The crop of affected potatoes is reduced by 50 - 60% due to a significant increase in the amount of waste.

The disease also affects the future generation, eyes on the tubers lose their seed, which leads to a decrease in germination. But this is not all that disease can bring. Other fungi and bacteria can infiltrate cavities and cracks that have already been infected, which can already completely hit the tuber.

The disease affects both tubers, stolons, and roots - i.e. underground organs of potatoes. On the tubers are formed brown contours. Bulbs and transverse cracks may appear on the tubers. The deepest form of common scab is the most malicious. Such cracks in diameter can reach 1.5 cm, and up to 1 cm in depth. The edges of the ulcers have a torn crust.

But the scab is curable, and you can get rid of it, or at least mitigate its effects on plants. But here it is not individual events that are important, but their complex.

An important condition in the fight against scab, is the choice of varieties of potatoes. It is necessary to grow only zoned and reliable varieties of potatoes. The following table varieties should be noted: Tiras, Rakurs, Polyana, Yavir, Lady Rosetta, Riviera, Vesta, Dara, etc. This is the most effective measure to contain scab.

After selecting the variety, you must choose the type of soil. High nutrient levels adversely affect the development of the disease. The physical features of the soil also affect, the disease develops better on sandy and loose soils than on heavy and clayey soils.

In view of this, potatoes are not recommended to return to their former place no earlier than after 3 years. It is also not recommended to grow potatoes after beets and carrots, as these crops are affected by the same disease.

The next tool is fertilizer. So acidic fertilizers like superphosphate, ammonium sulphate, or all sulphate-containing fertilizers, inhibit the development of common scab pathogens.

When organic fertilizers are applied, you can do yourself a disservice - to bring pathogens to the healthy soil, especially in unchanged manure, their amount is much greater than in rotted.

But this does not mean abandoning organic fertilizers, on the contrary, their correct use contributes to the development of favorable microorganisms, which are direct enemies of the common scab pathogens.

The last and direct way to fight, of course, is and will be fungicides. Seed dressing is always an effective remedy. Of these drugs are the following: Fungazil 100 SL, Rovral, Aquaflo, Maxim 025 FS, etc.

Meteorological conditions throughout the year remain important in the development of the disease. Dry years with elevated temperatures have a much better effect on the development of scab than cool and wet.

In view of all this, it should be noted that scab is a local disease. It is developed where the reaction of the soil is neutral. Soils with acidic or weakly acid reaction are free from this disease.

Agrotechnical receptions

Simple rules of planting, cleaning will help to get rid of the pest easily:

  1. On average, the causative agent of potato diseases lives no more than five years. Therefore, crop rotation will completely get rid of the parasite. On infected soil should not grow solanaceous crops and other root crops.
  2. Connoisseurs of agriculture noticed that in the fall on the site of potatoes, you can plant green manure. After the appearance of small shoots, again dig the ground. The soil will be completely cured from the pathogens scab. The remains of siderats promote the growth of beneficial bacteria and saprophytic fungi - natural parasitic killers.
  3. When sowing the culture is recommended to sprinkle with mustard powder bed before irrigation. Mustard protects the plant from soil parasites.
  4. It is not necessary to fertilize the soil under potatoes with fresh manure, inorganic fertilizers are better.
  5. The most favorable environment for the development of pathogens is alkaline; acidification of the soil is recommended by sulphate or superphosphate dressing.

We treat the soil from scab

The larvae die in the cold. But in the spring it is necessary to loosen, because the larvae also do not tolerate direct sunlight, and also the egg-laying beetles perish. You can arrange some simple traps: in April, fill the small holes with half-ripe grass, moisten and close the boards. The wireworm willingly settles in such pits, and after a few days the grass with the larvae can be picked and burned. And in the hole lay a new batch of grass.

Good yields!

The author: Anna Krivosheeva

A trip to Turkey for 10 days with the club "Velvet Season" - the city of Bodrum on the Aegean coast!

Anti-Scale Chemicals

Tubing treatment with special preparations before planting, spraying the bushes, the use of growth regulators gives excellent results:

  1. Quadrice is used against silver scab and rhizoctoniosis. They sprayed the soil before planting.
  2. Prestige - for dressing tubers before planting, fighting with ordinary and black types of fungus.
  3. Tuberculosis is an effective method of protection against any kind of disease. Used directly during planting.
  4. Maxim - for spraying potatoes before storage, followed by drying.
  5. Prestigerator works against any species, is used immediately before landing.
  6. Protect - a broad action disinfectant, used before planting or storing the culture. Effective for solanaceous crops, root crops.

How to deal with scab on potatoes

Methods of treatment of potato scab are reduced to the prevention of disease at the site and the protection of tubers:

1. Select planting material. Carefully sort through the tubers, culling the sick and with damaged skin.

2. Store potatoes for planting only in a cold, dry, well-ventilated area, avoiding condensation.

3. Etch seed potatoes with special preparations, for example, TMTD and polycarbacin.

4. To grow scab-resistant varieties, but remember that there is no absolutely sustainable potato.

6. To use crop rotation and plant green manure for potatoes (green fertilizers): soy, mustard, lupine, clover. Do not grow potatoes in one place year after year. If this is not possible, refuse to fertilize the soil with fresh manure.

7. Regularly water the bushes during the flowering period at the rate of 0.5 liters of water per plant.

8. Alkaline soil acidified with ammonium sulfate (2 tablespoons per 10 liters of water).

Additional security measures

Agronomists argue that the effective method of dealing with scab is the selection of varieties that resist fungal diseases. Selection of varieties of potatoes that are resistant to scab, advantages and disadvantages:

In addition to the listed varieties, scabs are opposed to: Bryansk New, Ramensky, Aspiya, Varmas, Bezhitsky, Messenger, Skoroplodny, Vilnia, Spring, Vyatka, Reserve, Zhukovsky Early, Prasna, Lyubimets, Posvit.

It has been observed that white-skinned varieties are more resistant to scab than pink ones.

Fighting scab on potatoes

If you have dug up potatoes struck with scab, then although you have reaped a good harvest, of course, you will not experience joy. To prevent this from happening again next season, I will tell you how to get rid of scab on potatoes.

Scab on potatoes

This is what ru.wikipedia.org writes about this disease. “There are several different types of potato scab caused by different types of actinomycetes, fungi and deuteromycetes: common, powdery, silver, lumpy (oosporosis) and black (rhizoctoniosis) potato scab.

Scab spoils the appearance of potato tubers, impairs the quality, taste and seed quality of potatoes, can affect the tuber tissue, increasing waste. Strongly scabbed potato tubers are unsuitable for food and seeding. ”

First of all, let all the potatoes harvested this year for food: choose, of course, the tubers that are not badly affected and do not choose from this crop for seeds clean, seemingly non-scab tubers. The fact is that if most of the crop is infected with scab, this fungus will spread throughout the potato.

Secondly, there are varieties of potatoes that are resistant to this disease. It makes no sense to list them, you will find everything on the Internet. But as in the first case, the new variety should not be mixed with the old crop!

Crop rotation will help to get rid of scab on potatoes, that is, in the same place planting potatoes in 3-4 years. But this, of course, is not always possible, so there is a way out - plant after harvesting the siderates of pulses.

Seed potatoes before planting can be treated with a solution of Fitosporin - 10 grams per 5 liters of water for 20 kg of potatoes.

In the period when the tops of potatoes begin to close, you can spray the crops with microelements - potassium permanganate + blue vitriol + boric acid - you need to take 3 grams each to 1 liter of water - this amount is enough for 10 sq.m.

There are rules that must be observed constantly and flawlessly:

  • when planting potatoes, it is not allowed to make fresh manure or compost that has not completely decomposed,
  • it is impossible to lime the soil: this error is very common where areas for potatoes are taken on acidic soils. To reduce the acidity of the soil, you can use the ash
  • Potato fertilizers and superphosphate are best for potatoes,
  • after harvesting the entire tops must burn or remove from the site.

How to get rid of potato scab

To prevent the spread of scab, use the full range of protective measures. Observe crop rotation so that infection does not accumulate in the soil. The land for potatoes must be prepared in advance, cleaned of scab pathogens using sideratov.

This technique contributes to the development in the land of saprophytic fungi and bacteria, and they are opponents of scab pathogens. In addition, siderata improve soil quality. The best predecessors for potatoes are corn, red beet, carrot, cabbage.

If your potato is often sick, choose varieties that are relatively resistant to scab: Snow White, Bronnitsky, Bryansk New, Vyatka, Zhukovsky Early, Favorite, Lasunak, Lugovskoy, Master, Skoroplodny, Sokolsky, Effect.

Do not feed potatoes with fresh manure or other non-decomposed organic fertilizers. Conversely, the damage to scab is reduced if you bring well-rotted organic matter into the ground 2-3 years old (500-600 kg per hundred).

Mineral fertilizers are useful in which the ratio of nitrogen to phosphorus and potassium is 1: 1 or 2: 1. So that the planted potato is more resistant to scab, copper, manganese and boron are introduced directly under the bushes.

40 g of copper sulphate, 20 g of manganese sulphate and 25 g of boric acid should be consumed per hundred. Water-soluble manganese is especially useful, because just when it is not enough, scab especially rages. It is important not to overdo it with lime. You can make only small doses of it (5-8 kg per hundred), together with organic matter, and even better in the fall under the digging.

Do not forget to increase the rate of potash fertilizer by 30% and at the same time apply boric acid. But we must understand that when chalking manganese is worse absorbed by potatoes, and the development of scab increases.

In order to significantly reduce the damage to plants by scabs, it is necessary to water the field from the moment of mass tying - tubers and until they reach 2-3 cm in diameter. At this time, the soil moisture in the zone of tuber formation should be at least 75-80%.

5 ways to protect the crop

Let's start with an analysis of the plot on which such potatoes are harvested: which varieties were previously grown there, where they came from and how they got to the garden bed. Most likely, with some regular planting material of the rootless variety, one type of this common potato disease has penetrated.

Potatoes could be successfully grown for many years in the same place, if pathogens did not settle in the soil. Unfortunately, the soil with scab disputes is not so easy to cure.

Use of scab resistant varieties

Effect: the ability to grow a crop of healthy potatoes in the infected area.

If the soil in your garden is still infected with scab, and you have no other place for planting potatoes, it remains only to look for varieties resistant to scab. For example, Borodyansky pink, Vodogray, Kosen-95, Serpanok, Kupava, Dubravka, Desiree.

What is better, fight or prevention?

So it turns out that most of the land we allocate for potatoes.Unfortunately, it is not always possible to observe crop rotation and, as a result, the emergence of a mass of diseases, in particular, scab on potatoes is probably the most common phenomenon.

This disease begins with small bumps, which are not all and pay attention. But if you do not take action, the disease begins to progress. Just imagine the neglected form of scab, when the tubers no longer have ulcers but cracks with torn edges.

Yields are also falling. More than half of the potatoes go to waste. The disease and the next crop does not affect the best way. The ulcers covering the tubers damage the eyes. If later one of them will sprout. That is very weak and good yields from them will not.

You can simply ignore the parsh, but over time it will be more and more, as it spreads from tuber to tuber and keeps its disputes in the ground for about 3 years. And you can not only take action, but also to prevent the appearance of the disease.

Scab on potatoes, methods of dealing with it

In general, of course, any disease is easier to prevent. The most important condition to avoid not only the appearance of scab, but also many other diseases, is respect for crop rotation.

It is not recommended to plant potatoes in the same place from year to year. If this condition is impracticable, as is often the case, it is necessary to avoid favorable conditions for the development of the disease, that's all.

This disease develops especially quickly in warm and humid weather on soils with neutral PH or alkaline. Most often you can find the disease on sandy, loose soil.

If you do not have the opportunity to change the place for planting potatoes, then you should not bring fresh organic matter to the site, it is better to use rotten compost.

To somehow contain the development of the disease, you can acidify the soil. To do this, dilute 20 grams of ammonium sulfate in a bucket of water and pour 0.5 liters under each bush. This should be done at the time of tying tubers.

If you notice the first signs of a disease on your potato, immediately take measures, it is always better to carry out prevention than to fight the disease.

How to get rid of potato scab

Scab - extremely unpleasant phenomenon for summer resident. Especially often potatoes suffer from this scourge. At the same time, both the yield and the quality of what remains remain. After all, when infected with scab in potatoes, the content of nutrients, vitamins, and starch decreases. The affected areas during cleaning have to be cut, and this is extra work and extra time.

How to find out the disease?

The disease begins to manifest itself at the stage of emergence of young potato nodules on the roots.

By the way, scab can be caused by several pathogens. Depending on their type, common, black, silver and powdery scab are distinguished. They can be distinguished by the appearance and extent of the damage to the potato. But the development of these infections and the measures to combat them are very similar.

What contributes to the development of the disease?

The most favorable conditions for the development of all types of scab - air temperature 20ºС and soil moisture 50-70%. In other words, the best conditions for the development of the potato itself will be wonderful for an unpleasant disease.

The scab also likes a good loose soil, with plenty of available calcium, an excess of nitrogen fertilizers, a lack of manganese and boron.

Control measures

  • use for planting only healthy seed germinated in the light,
  • choose high-quality zoned varieties,
  • pickle tubers before planting. For this you can use polycarbacin (0.4 kg per 10 liters of water),
  • observe crop rotation, do not plant potatoes at the same place in less than 4 years. Good precursors for potatoes are: corn, carrots, beets, legumes,
  • Do not use fresh manure to fertilize potatoes, this is scab's best friend. Suitable only well-rotted organic fertilizer,
  • good prevention of scab is keeping the soil moist at the beginning of plant budding.

A disease that dramatically reduces the yield

Common scab is manifested in the form of bulging ulcerations on the tubers. During storage, these sores spread at a high rate over the surface of the tuber and at the same time affect the eyes.

This leads to the fact that such potatoes become unsuitable for planting due to the absence of eyes. Perhaps some eyes still sprout, but they will give weak sprouts, which of course will affect the harvest.

Fighting potato scab

Common scab is considered the most common and harmful among all types of scab. Tubers are most often affected on light sandy and heavily limed soils, and especially in conditions of dry and hot summer.

Non-root dressing is also obligatory: manganese sulphate (2 g), boric acid (3 g) and copper sulphate (2 g) per 1 l of water. It is especially relevant where scab is common. It is also used for spraying potato crops (10 sq. M) in the closing phase of the tops.

The treatment-spraying of seed tubers before planting can be carried out with the following preparations: Agat25K (13 g dissolved in a liter of water per 100 kg of tubers), Fitosporin M (10 g / 5 l of water per 20 kg of tubers), Krezacin (10 drops / 2 l of water per 50 kg of seed potatoes).

Seeds of mid-ripening and mid-late potato varieties should be well treated with Prestige before germination of tubers (70-100 ml / 1 l of water per 100 kg). It is important that at least 3/4 of the surface of the tubers is processed.

In the absence of these preparations, seed potatoes are treated with a solution of trace elements of boron, manganese and copper. To do this, take 10 g of boric acid, copper sulfate and potassium permanganate, dissolved in 10 liters of water (per 100 kg tubers). Tubers are moistened with this solution, mated for 2-3 hours under a sacking or film, and then they are planted.

One of the ways to get rid of scab is planting potato varieties resistant to this disease (Pushkin, Nevsky, Kholmogorsky, Wizard, Elizabeth, Lomonosov, etc.).

How to get rid of blight and scab

Can I plant beans with potatoes? No you can not. Both plants are potassium-loving, and since the beans develop faster than potatoes, they will “unite” him and he will experience potassium starvation. In addition, the beans will make excessive doses of nitrogen, which will cause scab on potatoes. Potato has high illumination requirements, and fast-growing beans will shade it.

Therefore, the tops of potato will grow huge, and the tubers will be small, that is, the whole idea will lead to loss of harvest. But if one bean is planted in all the extreme plants and additionally between the tubers along the perimeter of the potato field, this measure will force the moles to leave the planting.

Phytophthora lives in copper-poor soils, so when planting, add a copper-containing drug to the wells, but in very small doses (at the tip of the knife). After the second hilling process, prophylactically spray the bushes with a 1% solution (1 h. Spoon per 0.5 l of water) of any preparation containing copper (Bordeaux mixture, copper sulphate, copper chlorine).

When black spots appear on the lower leaves, do not wait until the leaves begin to turn yellow, but immediately water the bushes over the leaves with a solution of Fitosporin. Watering repeat every 2 weeks. The drug "Zircon" also gives good results when spraying the lower leaves of potatoes.

There is one old-fashioned method: at the first signs of the disease (black dots on the lower leaves), water the tops of the potatoes with ordinary yeast (100 g of yeast per 10 liters of water).

Simultaneously with nitrogen, potassium should be introduced into the soil, then there will be no scab. Scab may appear on tubers and with excessive doses of calcium. That is, it is impossible to lime a field before planting or in the autumn to make large doses of lime for several years ahead. Do not and when planting to make too much ash under the tubers.

How to get rid of scab on potatoes? And why get rid of it, if the scab - a purely cosmetic defect? It does not affect the taste and storage of potatoes. Gradually, excess nitrogen and calcium from the soil will wash into the lower layers, and there will be no scab.

Is it true that planting white beans deters the Colorado potato beetle from a potato field? True. It is enough to plant one bean along with a tuber at all edges of the field, and the beetles from the neighbors will not move to you. But if their larvae wintered in your field, they will not crawl from your site to the next.

Potato tubers are badly damaged by wireworm moves. Is there some way to get rid of it? You can get rid of the wireworm dramatically using the predatory nematode "Nemabakt", which is usually sold in the ground "Protection". When planting, add a little of this soil for each tuber. But there is also an old-fashioned way: when planting, put a handful of dry onion peel under each tuber.

Why is the potato harvest falling with good care? There may be several reasons. You may have been using your planting material for many years and a large viral infection has accumulated. Not all varieties can be used for a long time, especially for varieties of foreign selection.

There are our varieties, for example, Nevsky, Lugovskoy, for planting which you can use your planting material for a long time, because these varieties do not accumulate infection for a long time. Another reason is nematode infestation. When you harvest, carefully look at the tubers.

If they have small balls that look like poppy seeds, then these are nematode cysts. It is time to change the field and plant nematode resistant varieties. After harvesting the potatoes, sow rye in winter, in the spring, mow it and dig the soil along with rye. But, maybe, the soil was simply depleted or crop rotation was disturbed. This often happens when, due to the lack of space, they plant potatoes in the same place for many years in a row.

Do I need to pick flowers from potatoes? If the field is small, it is better to cut it off. And if a few hectares, then there is no big point in this. And it is better to pick not the flowers, but the buds so that the potatoes do not waste energy (and they are considerable) on budding, flowering and seed reproduction.

If seed reproduction is not allowed, then the plant will put all its forces on the vegetative - tubers. Breakage of flowers gives an increase of about two tubers on each plant.

Is it necessary to mow the tops of potatoes? Sure, and it should be done 2 weeks before cleaning. This will avoid the contact of infected late blight tops with tubers (the infection is transmitted in this way), and will also stop the further growth of the tubers and give them the opportunity to build up a thick skin. Such potatoes better transport and storage.

If it rains during harvesting, then rinse the tubers with water from a hose, spray them with “Fitosporin”, dry them in a shed, and only then store them for storage.

Many-sided scab

WARTS on tubers - a rather frequent phenomenon, it is you who have not been seen with them, and who has been growing potatoes for decades, he knows that this is a scab. You shouldn't worry too much, after all the scab is not a phytophthora, but you need to be wary.

And this is why: the spores of the causative agent of this disease are found both in the ground and on plant residues after harvesting, and on the tubers themselves. From here, as they say, we will dance. Why it became so much that the tubers in the warts, and how it happened. Immediately, in one year to get rid of the scab, you may not succeed, but it is quite possible to reduce its harmfulness.

That's what it is, many-sided! Scab is caused by several types of soil fungi that persist in the soil for a long time, are very resistant to drought and withstand low air temperatures.

Specifically, what kind of scab on your tubers, you need to install in the laboratory - after all, this is a disease and it is installed only by laboratory.We will talk about the causes of scab in general and how to cope with it.

Most of all in private gardens common scab. In this disease, prominent scabs or warts pressed into the flesh are clearly visible. At the same time, the taste of tubers deteriorates, starch accumulates in them less, and their keeping quality is weakened. Strongly affected tubers are unsuitable for planting.

You pick off a fingernail, they will fall off. But if there are many such lumps, they can destroy the sprouts on the planted tubers and shoots, you will not get. Especially if the potato is planted in cold soil. Powdery scab forms small asterisks on tubers.

With tuberous scab tuber disease, slightly indented spots are formed, very similar to fitoftoric, but, unlike it, the flesh under the stain does not rot.
Silver scab also appears on tubers as depressed spots with a silvery sheen.

The scab mostly affects lentils - the smallest holes in the peel of tubers through which they breathe. Growing up, they tear the peel in different directions, and sometimes in the form of stars.

Can I fight a scab? Of course, and in any summer. But be sure to keep in mind that, as in other cases, a set of measures is needed here.

The culprit is manure

In the soil, pathogens of different types of scab live on various organic residues. Tubers on lung and loamy soils with weakly alkaline reaction are more strongly affected by it. Scab just loves alkaline soil. That is why on peatlands tubers often grow clean, smooth - because the soil is a little acidic.

Therefore, if you plan to add lime to potato beds, then take half, not the full rate. For example, if you usually deposit 40 kg per hundred, take only 20 kg.

By the way, about manure. He, too, may be the culprit for the appearance of scab. That is why the recommendations are always indicated - do not add fresh manure (and even straw) to the potatoes. Well, why do you need a scab on tubers?

What else does scab love? Cold, rainy summer, when the tubers have to be planted in cold land. A cloudy cool weather and frequent rains only exacerbate the overall picture.

But the hot summer is also good for her, and in the heat there is a surge in the disease. There is only one way out - watering, starting from the time of flowering, that is, tying the tubers and up to the time when they will be 2-3 cm in diameter.

In the cellar - only dry

For seeds for the next year, it is necessary to select tubers intact or with single sores. The fact is that scab ulcers are often formed in the eyes, and the affected tubers will have reduced germination - the number of stems in the bushes decreases.

Then the tubers will be stored normally. The only inconvenience - when cleaning these tubers, the peel has to be cut thicker. Well-dried tubers in the cellar can be powdered with ashes, sprinkled with dry rowan leaves, dry garlic husks, melissa, and wormwood.

What is the grade?

Pay attention to the varieties you grow. Find out their resistance to this disease. Maybe you should choose medium-resistant (Scarlet Sail, Blue, Spring, Inspiration, Skylark, Nevsky, Svitanok, Fairy Tale, Lilac Fog, Good Luck, etc.) or highly resistant to scab (League, Lugovskoy, Sturgeon Peter, Bullfinch, Snow Maiden, Fascinator and others .). Less affected by scab red-cultivated potato varieties.

Your helpers

To prevent the scab from damaging sprouts and roots in the initial period of growth, before planting, treat seed tubers with a solution of two components: boric acid (10 g) and copper sulphate (2 g) per 10 liters of water. For processing 50 kg of tubers, 1 l of this solution is sufficient.

Now there are many drugs that prevent the emergence and spread of fungal and bacterial diseases. You can use them. Here, for example, "Fitosporin-M". In its solution, you can process the tubers before planting, and then spray the planting.

The drug "Zircon" also helps to resist the diseases of potatoes. Processing them is carried out on growing plants. And "Epin-extra" is your assistant in the fight against various diseases of the potato.

Well, let's look back. For example, in the Pomor villages a long time ago, with wireworm, phytophthora and scab, they fought in a very simple and accessible way: before digging up the soil, ordinary table salt was poured around the site, somewhere a couple of kilograms per hundred. And that's all.

I also tried this method. Great results! And do not be afraid of soil salinization - it will not.

Since the scab does not like acidic soils, note this fact. When planting, drop some acid fertilizers into the wells: superphosphate or ammonium sulfate - on a pinch - and mix with the ground.

Resistant Potato Varieties

Modern breeding breeds potatoes resistant to many infections. We give a description of the varieties:

  1. Alyona - early ripe pink with rounded fruits. Not afraid of drought, any kind of scab, prone to late blight.
  2. Snow White is a medium early variety of round shape. Perfectly stored, resistant to late blight, scab.
  3. Lasok is a product of the selection of Belarusian scientists, high-yielding resistant.
  4. Resource - one of the most resistant, not afraid of drought, temperature changes. It is not susceptible to sources of infection, even after mechanical damage.
  5. Temp - airy light yellow tubers, not susceptible to fungal infections.

Prevention, crop conservation

Preventive measures for all types of pathogens are about the same:

  • careful selection of planting material
  • storing potatoes in a cold, dry, well-ventilated area,
  • spring tuber dressing
  • growing varieties resistant to the disease
  • pre-germination in bright sunlight,
  • crop rotation,
  • inorganic fertilizers,
  • spring acidification procedure, which allows to treat the soil.

  1. The shelf life of different varieties of culture differ. Therefore, putting it in storage, it is necessary to take into account that early-maturing varieties must be processed before November. For longer preservation, use late or mid-season.
  2. You should not hope that nothing will happen to the tubers in the cellar. Infection can cause rotting of root vegetables.
  3. The best neighbor for wintering potatoes - beets, able to absorb the excess moisture.
  4. Throughout the storage of roots, you need to sort out, sifting off damaged.

Cultivation of infected land, expert advice

Seasoned gardeners know to effectively destroy the scab on potatoes, you need to know how to heal the earth. To get rid of the parasite, they advise you to work the land before sowing with special preparations. The week before that, make mineral fertilizers.

Do not apply to the soil for potatoes:

  • ashes
  • bleach
  • fresh manure, humus.

Active sowing of siderats completely eliminates parasites for 2-3 years, it is necessary to plant immediately after the harvest. Such plants are:

Summing up, it should be noted - scab is a very unpleasant, but curable disease. Using the treatment methods described in the article, you can easily cope with it.

Here is a symbiosis

Do not allow scab to spread legumes: peas, beans, beans. Potatoes planted after them will always be clean. After all, crop rotation, that is, changing crops grown over the years is the most reliable means against all diseases.

You can combine and planting: in each hole when planting throw 2 peas or one bean seed. And if the scab struck all the potatoes, then the sideratnye cultures should be constantly registered in your garden. These are rye, oats, mustard, phacelia, etc.

Useful neighborhood: plants that protect potatoes from scab

Experienced amateur gardeners have found that it is possible to use siderats not only after harvesting potatoes, but also during their cultivation.Monoculture sown in the aisle. When the plants reach 15-20 cm, they are cut and treated with EM drugs. Good results are obtained by the use of different plant species, when a number of legumes are replaced by crucifers.

Sideratov layout scheme:

Vika → mustard → lupine → alfalfa → radish oilseed → peas.

Regions of risk of infection with scab potatoes

Not a single agronomic zone is insured against the disease. The activity of the pathogen depends on weather and microclimatic conditions. An important role is played by how carefully the maintenance of soil fertility is observed. Indirectly, the spread of the fungus is affected by the presence of other pathogens and pests. A large number of adverse factors weakens the potato, then it is easily affected by scab. Similar conditions can occur in any region.

Category: Questions and Answers

Question number 1. How much time can you get rid of scab on potatoes?

It is impossible to eliminate the pathogen, but to significantly reduce its number is real. For this prophylactic and therapeutic measures need to be applied constantly.

Question number 2. How does scab affect the development of potatoes?

The growth of shoots slows down, the stems become thin and fragile, the potatoes are small in the ulcers. In affected tubers, the starch content is reduced by 40%. During storage, the fungus continues to spread, infecting the tuber. The longer the potato lies, the less the edible part remains.

Question number 3. What is the danger of scab to humans?

The fungal pathogen scab is not transmitted to humans as a disease. The downside is the reduction of potato nutrients.

Errors in the fight with scab on potatoes

  1. Often gardeners when harvesting potatoes do not pay attention to small bulging sores. If you do not take measures scab is activated so that irregularities turn into deep cracks with torn edges.
  2. Often gardeners make fresh organic fertilizers of high concentration. This is a favorable environment for the development of scab. Apply organic matter only in a 1:15 solution.
  3. In small areas, potatoes are planted in the same place year after year. If crop rotation is not possible, it is better to use siderats for soil improvement.

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Good day, dear reader! Last year was very fertile and the potato harvest was quite a lot. We distributed it to all relatives and friends. This year, I thought that everything would be the same as that year, but no.

Digging up a crop, found out - the tubers damaged by a fungus. It turns out - it was an ordinary scab. Where did she come from on my site? I have been thinking about this question for a long time, and I was also worried about what needs to be done to get rid of it.

I was lucky that my mother was an experienced gardener and gave me good advice. Thanks to them, I have treated the entire plot of the vegetable garden with the necessary preparations and look forward to the next season. In this article you will learn: how to get rid of scab on potatoes, which varieties are better to use, and also how to fertilize root crops.

How to get rid of scab on potatoes - tips

It often happens that from a certain season, potato tubers are increasingly covered with rough ulcers every year, they are worse stored, and when they are cleared, a lot of waste is obtained. Moreover, despite all the efforts of the gardener, every year the problem is only aggravated.

How to get rid of scab on potatoes

And the culprit is potato scab. How to get rid of scab on potatoes? Let's start with an analysis of the plot on which such potatoes are harvested: which varieties were previously grown there, where they came from and how they got to the garden bed.

Most likely, with some regular planting material of the rootless variety, one type of this common potato disease has penetrated.

There are many varieties of potato scab, but the ways of spreading the infection are the same for all - planting tubers and soil from the site where infected plants were planted at least once. Potatoes could be successfully grown for many years in the same place, if pathogens did not settle in the soil. Unfortunately, scabbing is not easy to cure.

Potato - how to get rid of phytophtoras and scab

Common scab is considered the most common and harmful among all types of scab. Tubers are most often affected on light sandy and heavily limed soils, and especially in conditions of dry and hot summer. In the re-limestone areas where the disease is rampant, physiologically acidic forms of mineral fertilizers (superphosphate, ammonium sulfate, potassium sulfate) must be applied.

They will improve the nutrition of plants with nitrogen, phosphorus and potassium, sulfur. Non-root dressing is also obligatory: manganese sulphate (2 g), boric acid (3 g) and copper sulphate (2 g) per 1 l of water. It is especially relevant where scab is common. It is also used for spraying potato crops (10 sq. M) in the closing phase of the tops.

The treatment-spraying of seed tubers before planting can be carried out with the following preparations:

  • Agat25K (13 g dissolved in a liter of water per 100 kg tubers)
  • Fitosporin M (10 g / 5 l of water for 20 kg of tubers),
  • Krezacin (10 drops / 2 liters of water per 50 kg of seed potatoes).

Seeds of mid-ripening and mid-late potato varieties should be well treated with Prestige before germination of tubers (70-100 ml / 1 l of water per 100 kg). It is important that at least 3/4 of the surface of the tubers is processed.

In the absence of these preparations, seed potatoes are treated with a solution of trace elements of boron, manganese and copper.

To do this, take 10 g of boric acid, copper sulfate and potassium permanganate, dissolved in 10 liters of water (per 100 kg tubers). Tubers are moistened with this solution, mated for 2-3 hours under a sacking or film, and then they are planted.

One of the ways to get rid of scab is planting potato varieties resistant to this disease (Pushkin, Nevsky, Kholmogorsky, Wizard, Elizabeth, Lomonosov, etc.). Can I plant beans with potatoes? No you can not.

Both plants are potassium-loving, and since the beans develop faster than potatoes, they will “unite” him and he will experience potassium starvation. In addition, the beans will make excessive doses of nitrogen, which will cause scab on potatoes.

Potato has high illumination requirements, and fast-growing beans will shade it. Therefore, the tops of potato will grow huge, and the tubers will be small, that is, the whole idea will lead to loss of harvest. But if one bean is planted in all the extreme plants and additionally between the tubers along the perimeter of the potato field, this measure will force the moles to leave the planting.

How to protect potatoes from phytophthora

Plant early varieties, they leave phytophthora, because they have time to mature before it begins to rage. There are varieties of medium maturity that are resistant to late blight disease: Lugovskoy, Granola and others.

Phytophthora lives in copper-poor soils, so when planting, add a copper-containing drug to the wells, but in very small doses (at the tip of the knife). After the second hilling process, prophylactically spray the bushes with a 1% solution (1 h. Spoon per 0.5 l of water) of any preparation containing copper (Bordeaux mixture, copper sulphate, copper chlorine).

When black spots appear on the lower leaves, do not wait until the leaves begin to turn yellow, but immediately water the bushes over the leaves with a solution of Fitosporin. Watering repeat every 2 weeks.

The drug "Zircon" also gives good results when spraying the lower leaves of potatoes. There is one old-fashioned method: at the first signs of the disease (black dots on the lower leaves), water the tops of the potatoes with ordinary yeast (100 g of yeast per 10 liters of water).

Getting rid of scab

Scab most often occurs because there is a lot of nitrogen in the soil. This happens when large doses of manure are applied, after sowing and subsequent plowing of siderats (in particular, after winter rye or peas), when added to azofoski tubers and so on. Simultaneously with nitrogen, potassium should be introduced into the soil, then there will be no scab.

Scab may appear on tubers and with excessive doses of calcium. That is, it is impossible to lime a field before planting or in the autumn to make large doses of lime for several years ahead. Do not and when planting to make too much ash under the tubers.

Common scab is manifested in the form of bulging ulcerations on the tubers. During storage, these sores spread at a high rate over the surface of the tuber and at the same time affect the eyes.

This leads to the fact that such potatoes become unsuitable for planting due to the absence of eyes. Perhaps some eyes still sprout, but they will give weak sprouts, which of course will affect the harvest.

  1. The scab develops most strongly when the reaction of the soil is close to alkaline, therefore it is not possible to add fresh manure to the potato when planting. Better in the spring to use manure humus.
  2. If you still planted tubers with small lesions with scab, then you need in the flowering phase, when the process of formation of tubers begins to thoroughly water the potatoes with water.
  3. It is necessary for alkaline soil reaction (pH> 7), to acidify the soil.
  4. Well, of course, one cannot artificially alkalize the soil by adding lime, dolomite flour or chalk before planting potatoes.
  5. One of the important methods of combating potato scab, if possible, is to observe crop rotation. It is useful to place the potatoes after legumes.
  6. It is necessary to carry out tuber svetozakalka before planting.
  7. Use varieties that have relative resistance to scab, such as Bulletin, Detskoselsky, Pamir, Resource, Sokolsky, Zhukovsky Early, Energy.

To prevent the spread of scab, use the full range of protective measures. Observe crop rotation so that infection does not accumulate in the soil. The land for potatoes must be prepared in advance, cleaned of scab pathogens using sideratov.

After harvesting early vegetables or throughout the season — from spring to late summer — sow on the field where you plan future potato plantations, lupins, peas, beans, mustard, and rapeseed.

After flowering or the formation of legumes first fruits, bury these medicinal plants to the ground to a depth of 15-20 cm. This technique contributes to the development of saprophytic fungi and bacteria in the ground, and they are opponents of scab pathogens. In addition, siderata improve soil quality.

The best predecessors for potatoes are corn, red beet, carrot, cabbage. If your potato is often sick, choose varieties that are relatively resistant to scab: Snow White, Bronnitsky, Bryansk New, Vyatka, Zhukovsky Early, Favorite, Lasunak, Lugovskoy, Master, Skoroplodny, Sokolsky, Effect.

Do not feed potatoes with fresh manure or other non-decomposed organic fertilizers. Conversely, the damage to scab is reduced if you bring well-rotted organic matter into the ground 2-3 years old (500-600 kg per hundred).

Mineral fertilizers are useful in which the ratio of nitrogen to phosphorus and potassium is 1: 1 or 2: 1. So that the planted potato is more resistant to scab, copper, manganese and boron are introduced directly under the bushes. 40 g of copper sulphate, 20 g of manganese sulphate and 25 g of boric acid should be consumed per hundred.

Water-soluble manganese is especially useful, because just when it is not enough, scab especially rages. It is important not to overdo it with lime. You can make only small doses of it (5-8 kg per hundred), together with organic matter, and even better in the fall under the digging.

Do not forget to increase the rate of potash fertilizer by 30% and at the same time apply boric acid.But we must understand that when chalking manganese is worse absorbed by potatoes, and the development of scab increases.

Choosing the right grade

Pay attention to the varieties you grow. Find out their resistance to this disease. Maybe you should choose medium-resistant (Scarlet Sail, Blue, Spring, Inspiration, Skylark, Nevsky, Svitanok, Fairy Tale, Lilac Fog, Good Luck, etc.) or highly resistant to scab (League, Lugovskoy, Sturgeon Peter, Bullfinch, Snow Maiden, Fascinator and others .). Less affected by scab red-cultivated potato varieties.

How to treat scab on potatoes

Suspicious bulges in the tubers indicate that radiant mushrooms attack the potatoes. Do not be mistaken that small ulcers do not harm the roots. The danger is that there are 5 species of scab, plus constantly mutating strains.

If the disease is not combated, damage to the crop on a large scale is possible. The article will explain why scab appears on potatoes, how to fight it with folk and chemical methods. It is impossible to get rid of malicious pathogens completely.

It is necessary to create conditions under which they will not spread. The result is achieved with the observance of agronomic, biological and chemical methods of control.

One of the most effective ways to prevent is to maintain crop rotation. It is possible to plant potatoes on the place where it grew, not earlier than in three years. In the conditions of small areas there is no possibility to fulfill this rule Then come to the aid of green fertilizer - siderata.

After harvesting can be sown:

  1. Winter crops - rye or oats,
  2. Cruciferous - mustard, rapeseed, oil radish,
  3. Legumes - clover, vetch, soy.

Of great importance for the prevention of disease, is the fertility of the soil. The constant combination of organic fertilizers and siderats increases the humus content in the soil. Thanks to him, plants receive a maximum of balanced nutrition and protection from disease.

Another important rule is the treatment of planting material.

Even if no damage is found, the tubers need to be sprayed with fungicides. For this purpose, use drugs:

  • "Phytoplus",
  • "Maxim 025 FS",
  • Fungazil 100 SL,
  • Aquaflo,
  • Rovral and others.

If a scab has appeared, this soil signals that it cannot cope with the harmful flora, it needs additional food.

Diseases of root crops and measures to combat them

Such simple and ubiquitous vegetables, like potatoes, carrots, turnips, are less likely to be exposed to dangerous diseases than rarer crops. However, they face all sorts of dangers. The main diseases of root crops - rhizoctoniosis, root and wet bacterial rot - require increased attention from gardeners and timely processing of crops.

Risoctoniosis of potatoes: photos and control measures

The causative agent of this disease is a fungus that infects beets, carrots, turnips, as well as parsley and other root vegetables. Infection occurs during the period of growth and development of crops, and during storage of the crop, in most cases - in the second half of summer. The characteristic features of diseased plants are as follows: the leaves first wither, and then turn yellow and die.

Look at the photo: Rhizoctoniosis of potato provokes the appearance of dark gray spots on the entire surface of the root crop, with time they become red, slightly depressed, and then become covered with violet with a reddish shade.

The root crop is completely covered with numerous small black dots.

As seen in the photo, with rhizoctoniosis in the last stage, the plant dries out or rots completely.

As a rule, the sources of infection are diseased plants and soil. The development of the disease contribute to heavy rainfall in warm weather, acidic heavy soils.

Measures to combat rhizoctoniosis are reduced to measures for tillage - liming (if the soil is acidic), digging in autumn, timely removal of plaque from its surface, as well as plant residues.

Diseases of Cornea and Wet Bacterial Rot

The causative agents of corneed are various soil fungi. The seedlings and young plants are most vulnerable. Most root crops (beets, carrots, onions, etc.) are susceptible to this disease.

Pay attention to the photo: the root damages the root and root neck, the plants wither, turn yellow and die. The disease occurs on acidic, compacted and waterlogged soils, can also be transmitted with seeds.

Control measures: planting healthy seeds, crop rotation, liming of the earth, loosening between the rows.

Along with carrots, wet bacterial rot affects parsley, parsnip and celery. The disease begins in the garden. Root spots appear on the roots, as a result of which the plants begin to fade.

For the prevention of wet bacterial decay for storage, it is necessary to select only healthy root crops, as well as to take measures to create the optimum temperature and humidity conditions in the storage.

The most intensive development of the disease occurs when storing root crops. They become slimy, watery, their tissues decompose.

Scab on potatoes: how to treat the earth and what preventive measures

Affected root crops can become sources of infection for nearby healthy fruits, so you should sort them out regularly. Dried, damaged and supercooled roots are prone to disease in the first place. The development of rot contributes to warm weather, combined with high humidity. Often the cause of the disease is the laying of the storage of wet roots.

After harvesting, plant residues should be removed from the plot, and the soil should be treated.

Scab - signs of disease and methods of treatment

But in the spring it is necessary to loosen, because the larvae also do not tolerate direct sunlight, and also the egg-laying beetles perish. You can arrange some simple traps: in April, fill the small holes with half-ripe grass, moisten and close the boards. The wireworm willingly settles in such pits, and after a few days the grass with the larvae can be picked and burned. And in the hole lay a new batch of grass.

Good yields!

The author: Anna Krivosheeva

A trip to Turkey for 10 days with the club "Velvet Season" - the city of Bodrum on the Aegean coast!

The name was due to the black formations on the tuber, which can be confused with lumps of adhering soil. The fungus can penetrate into the green shoots, as a result of them are formed brown and spots and holes. From such a lesion sprouts quickly die before they leave the ground. Black scab can infect the root system of adult plants. As a result, the plant languishes, its leaves turn yellow and it dies.

For the pathogen (Rhizoctonia solani), high soil moisture is required - 80-100%. Temperatures are average enough for spring or summer - 17-20 ° C. Most pathogen like loamy soil. More often the disease develops with late and rainy spring. The peculiarity of the disease is that there are no potato varieties resistant to the pathogen. Often the fungus destroys plants before germination.

Control measures should be taken depending on the type of fungal infection. Since each type of pathogen has its own preferences for temperature and humidity. However, there are general principles of fighting that help with any kind of scab.

1. Planting in spring exceptionally healthy tubers. It is necessary to throw away the already infected or damaged tubers (cracked, chipped, eroded).

2. Potatoes for planting should be stored in a dry, light-free, cold place. such conditions prevent the formation of condensate.

3. Before sowing, keep the tubers in the light to germinate sprouts

four.It is desirable to apply fertilizers taking into account the substances already contained in it (determine them by soil type or by chemical analysis)

5. In the case of the disease in the garden. Again, potatoes can be planted at the same place in 4-5 years.

6. Fresh manure can not be used to fertilize the soil for potatoes. It must be used in advance for the year, under the culture preceding the sowing of potatoes.

7. As siderata, you can use lupine, clover, soy, mustard.

8. Potatoes are undesirable to constantly grow in the same place. It is necessary to periodically change the sown area.

9. To carry out deep loosening of row spacing, especially 10-12 days before the appearance of sprouts

10. Potatoes should preferably be treated with polycarbacin, TMTD or other special preparations against fungal diseases before sowing.

11. If you find a certain type of scab for the next year, you can grow varieties resistant to the causative agent. But we must understand that this method of struggle cannot be independent and replace other methods, since there is no absolutely sustainable variety.

12. Fungi need an alkaline environment, so you can acidify the soil, introducing ammonium sulfate into irrigation water (20 grams per 10 liters).

13. It is useful to sow leguminous plants on contaminated soil, as they significantly oxidize it, reducing the safety of spores.

14. When planting, you can add manganese, copper or boron to the seed.

15. Increases the thickness of the peel and, accordingly, its protection by mowing potato tops 10-15 days before harvesting.

A plant whose roots are affected by scab:

Individual control of scab species:

1. Scab common. Since the pathogen loves dry sandy soil, it is desirable to carry out a thorough watering. It should be done immediately after planting, and should be carried out regularly until adult plants with a stem thickness at the root of 1.5–2 cm grow.

2. Powder scab. In a garden for several years, varieties of potato varieties resistant to powdery scab can be grown: majestic, lorch, cardinal, jubilee. Before planting the tubers, it is advisable to hold for 5-7 minutes in a 0.2% formalin solution. After soaking, cover the potatoes with a tarp for 2-3 hours.

3. Scab silver. Potato dressing helps just before planting and immediately after harvesting. For processing, you can use "Titusim", "Botran", "Celeste", "Nitrafen" and "Fundazol."

Scab on potatoes: how to treat the earth to avoid this scourge

No pathogen-resistant varieties. To increase the stability of the potato before planting, it is etched with antifungal agents: “Maxim”, “Planriz”, “Vivataks”, “Baktofit”, “Integral” and “Fenoram”. It is necessary to plant potatoes exclusively in warm earth, with a temperature of more than 8 ° C. Also abide by the rules on the depth of landing.

The name was due to the black formations on the tuber, which can be confused with lumps of adhering soil. The fungus can penetrate into the green shoots, as a result of them are formed brown and spots and holes. From such a lesion sprouts quickly die before they leave the ground. Black scab can infect the root system of adult plants. As a result, the plant languishes, its leaves turn yellow and it dies.

For the pathogen (Rhizoctonia solani), high soil moisture is required - 80-100%. Temperatures are average enough for spring or summer - 17-20 ° C. Most pathogen like loamy soil. More often the disease develops with late and rainy spring. The peculiarity of the disease is that there are no potato varieties resistant to the pathogen.

How to get rid of scab on potato folk remedies?

Often the fungus destroys plants before germination.

Control measures should be taken depending on the type of fungal infection. Since each type of pathogen has its own preferences for temperature and humidity.However, there are general principles of fighting that help with any kind of scab.

1. Planting in spring exceptionally healthy tubers. It is necessary to throw away the already infected or damaged tubers (cracked, chipped, eroded).

2. Potatoes for planting should be stored in a dry, light-free, cold place. such conditions prevent the formation of condensate.

3. Before sowing, keep the tubers in the light to germinate sprouts

4. It is desirable to apply fertilizers taking into account the substances already contained in it (determine them by soil type or by chemical analysis)

5. In the case of the disease in the garden. Again, potatoes can be planted at the same place in 4-5 years.

6. Fresh manure can not be used to fertilize the soil for potatoes. It must be used in advance for the year, under the culture preceding the sowing of potatoes.

7. As siderata, you can use lupine, clover, soy, mustard.

8. Potatoes are undesirable to constantly grow in the same place. It is necessary to periodically change the sown area.

9. To carry out deep loosening of row spacing, especially 10-12 days before the appearance of sprouts

10. Potatoes should preferably be treated with polycarbacin, TMTD or other special preparations against fungal diseases before sowing.

11. If you find a certain type of scab for the next year, you can grow varieties resistant to the causative agent. But we must understand that this method of struggle cannot be independent and replace other methods, since there is no absolutely sustainable variety.

12. Fungi need an alkaline environment, so you can acidify the soil, introducing ammonium sulfate into irrigation water (20 grams per 10 liters).

13. It is useful to sow leguminous plants on contaminated soil, as they significantly oxidize it, reducing the safety of spores.

14. When planting, you can add manganese, copper or boron to the seed.

15. Increases the thickness of the peel and, accordingly, its protection by mowing potato tops 10-15 days before harvesting.

A plant whose roots are affected by scab:

Individual control of scab species:

1. Scab common. Since the pathogen loves dry sandy soil, it is desirable to carry out a thorough watering. It should be done immediately after planting, and should be carried out regularly until adult plants with a stem thickness at the root of 1.5–2 cm grow.

2. Powder scab. In a garden for several years, varieties of potato varieties resistant to powdery scab can be grown: majestic, lorch, cardinal, jubilee. Before planting the tubers, it is advisable to hold for 5-7 minutes in a 0.2% formalin solution. After soaking, cover the potatoes with a tarp for 2-3 hours.

3. Scab silver. Potato dressing helps just before planting and immediately after harvesting. For processing, you can use "Titusim", "Botran", "Celeste", "Nitrafen" and "Fundazol."

4. Black scab. No pathogen-resistant varieties. To increase the stability of the potato before planting, it is etched with antifungal agents: “Maxim”, “Planriz”, “Vivataks”, “Baktofit”, “Integral” and “Fenoram”. It is necessary to plant potatoes exclusively in warm earth, with a temperature of more than 8 ° C. Also abide by the rules on the depth of landing.

Let's get acquainted with scabs

1. Black scab, or rhizoctoniosis, caused by the fungus, is familiar to many gardeners in Russia, especially the north-western and far-eastern regions and the non-black-earth zone.

In this disease, the tubers are dotted with “small poles” of irregular shape and of different size, resembling in appearance a lump of adhering dirt. This "Ospinka" is the resting stage of the black scab pathogen, in which the fungus overwinters on tubers, in the soil and on plant debris. Since the "pockmarks" do not spoil the flesh of the tubers and are easily scraped off their peel, no one usually fights with scab.

But the causative agent of this disease, in addition to the resting stage in the form of "ospin", there are still very dangerous stages of development: aggressive and sexual. The aggressive stage is manifested after tuber planting, when ospin germination occurs in potato sprouts and the mycelium is introduced into all plant cells. This leads to thinning of seedlings (15-20%), wilting of the whole plant, formation of small air tubers in the axils of the leaves, sometimes reddening and twisting of the upper leaves. In addition, in the middle of summer, white bloom is clearly visible at the base of the stems - the sexual stage of the fungus causing a disease called the white stem, indicating a particularly strong development of the disease.

Black scab, also affects radish, cabbage, beets, carrots, lettuce, pumpkin, cucumbers and other crops - only about 160 species from many families. Early ripening varieties are more susceptible to this disease than late ripening ones.

2. Common scabThe pathogens of which are radiant fungi are widespread and harm in most soil-climatic zones of Russia.

In potato tubers infected with common scab, the nutritional value decreases, the amount of waste increases during cleaning, the starch content decreases (up to 30%), and the presentation of the product worsens. The use of diseased tubers for seed purposes reduces the yield by 15-40%.

There are four types of common scab, which differ in the shape and nature of the surface ulcerations: flat, convex, deep and netted.

Flat scab appears as a rule on young tubers, forming on them rusty-brown scab-like ulcers affecting the topmost layer of the peel.

Bulging scab can be distinguished by education on the surface of tuber warts or convex scabs, otherwise it does not differ from flat scab.

Most malicious deep scab formwhich usually appears during the harvesting of potatoes and forms brown ulcers on the tubers, surrounded by torn peel, penetrating the flesh of the tuber to a depth of 0.5 cm.

Mesh scab can be recognized by a continuous rough surface consisting of shallow grooves intersecting in different directions.

When harvesting potatoes from moist soil in the depth of the sores, one can see a grayish, greenish bloom of radiant fungi, which quickly disappears in the air.

Spores of pathogens of common scab from diseased tubers or from soil penetrate into healthy tubers primarily at a young age. They are able to survive for a long time at a frost of 30 ° C and remain in a dried state for more than two years.

3. Powdery scab, the causative agent of which is also a mushroom that does not have a developed mycelium, is distributed mainly in northwestern and central regions of Russia. On freshly harvested tubers, the infection manifests itself as an ulcer with scraps of the upper and lower layers of the peel.

Proven methods of combating potato scab

At the bottom of stellate-shaped ulcers, there is a powdery brown mass of spores of the pathogen. Infection of potato plants occurs by spores spreading in diseased tubers or in the soil, where they are able to exist up to 5 years.

4. Silver scab, the causative agent of which is a mushroom, is found in the northwestern, northeastern, central regions and in the Far East. Silver potatoes affect only potatoes, mainly tubers, especially at the end of summer. This disease can be detected already when digging tubers on slightly visible, slightly indented light brown spots.

Harmfulness of the disease is manifested mainly during storage, especially in the spring, when the tubers are covered with dark brown depressed spots with a silver shine, clearly visible on a wet surface, turn brown and rot, sprouts die off and do not germinate.

The source of infection is infected tubers, less often the soil, where the fungus persists for a long time.The defeat of the silver scab promotes penetration into the tubers during storage of pathogens of other fungal and bacterial diseases.

In preparing the article used materials from the application "Our estate" for 1999.

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Folk ways and means

In addition to chemicals, you can use available herbal remedies and organic fertilizers that enhance the immunity of potatoes to scab.

  • When planting - bird droppings solution 1:15, pour 1 l per well,
  • The sprouting of the stems is ½ l of liquid mullein or bird droppings per 10 l of water, we pour 0.5 l under a single bush,
  • Formation of a bush - 10 kg of nettle per 100 liters of water to insist a week, 1 l per bush,
  • Budding - 3 tablespoons of ash per 10 liters of water, 1 l per bush,
  • The beginning of flowering - 2 cups of mullein per 10 liters of water, ½ liters per bush.

Where the disease comes from and how it develops

Scab - a disease arising from the fungus.

  • Astonished land.
  • Sick tuber crops, on which the disease is not visible, but there is a fungus, since during the initial spread it is not visible.
  • Excess nitrogen in the soil stimulates the development of scab.
  • If you plant potatoes in one place from year to year, then diseases will accumulate in the ground.
  • High ground temperature.
  • Land having acidic properties.
  • Soil fertilizer before planting potatoes fresh manure.

What potato varieties are considered highly resistant to the disease

  • Alyona - early variety. Tubers are oval, they have scarlet skin and snow-white flesh. Potatoes are resistant to scab, cancer, drought. But not resistant to late blight, it will have to fight.
  • Snow White - medium early variety. Good and long stored. It has resistance to scab and late blight. Oval tubers have yellowish peel and snow-white flesh, tiny eyes.
  • Resource - mid-season. Resistant to drought and heat. Almost not subject to viral diseases, scab. Resistant to mechanical damage. Tubers are oval with beige-skinned.
  • Lasock (Lasunak) - medium late, launched in Belarus. He has excellent taste, high yield. Resistant to scab, it almost does not hit the Colorado potato beetle.
  • Pace - late. Large, rounded-flat in shape with a creamy shade of skin and creamy hue of flesh, it tastes great. Resistant to scab.

In order for the potatoes not to be affected by scab, it is worth picking up for planting special varieties that are resistant to this disease, and also not to neglect prevention.

Potato scab belongs to those garden problems that cause gardeners, gardeners a lot of trouble, but human health is not directly threatened. Because of this, many farmers do not pay enough attention to the fight against it, writing off sometimes modest harvests to the vagaries of the weather, poor quality seed, the high cost of fertilizers. Such an approach has the right to life, but it is hardly possible to call it optimal. Especially considering the fact that a lot of remedies have been developed against this disease, each of which, if used correctly, will allow to solve the problem with high efficiency. But before declaring “military actions”, you need to figure out what you are dealing with.

To fight or not to fight?

Scab can ruin much of a crop

This question is asked by many amateur gardeners. On the one hand, the affected tubers may well be used for food, because they do not carry an immediate threat to human life and health. How pleasant it will be to cook and eat them is an open question, but you definitely won't get to the hospital. On the other hand, potato potato scab is a rather unpleasant problem. It provokes a decrease in nutritional value, reduces the shelf life of the harvested crop and contributes to the development of rot.Also, you should understand that contaminated potatoes are not suitable for use as a seed, otherwise you can immediately forget about any decent harvest next year. Therefore, if you are not ready to part with half of the harvested crop, fighting scab on potatoes should be a priority.

  • preservation of all nutrients in potatoes and presentable,
  • a significant increase in the shelf life of the harvest,
  • increasing potato resistance to pests and diseases,
  • reducing the number of defective tubers, and, consequently, financial gain.

Methods of struggle and prevention

You can get rid of this disease, although it will have to make some effort and tune in for good luck. But do not expect that a single treatment of the site with specialized chemicals will suffice. After all, even the most effective drugs for potato scab require systematic use, supplemented by a set of special preventive measures.

This potato can not be eaten

  • Use only high-quality and healthy planting material, which should be purchased only in specialized agrotechnical stores.
  • Before planting, be sure to pickle the tubers with specialized preparations.
  • In certain cases, processing potatoes for scab with boric acid or manganese compounds can help (especially this technique is effective when planting).
  • Try not to use fresh manure as the main fertilizer.
  • Alternate planting potatoes with any legumes - this will significantly reduce the likelihood of scab.
  • Acidify the soil a little if it is too alkaline. Ammonium sulphate is perfect for this (2 tablespoons per 10 liters of water). For processing 1 bush you will need about 400-500 ml of solution.
  • Potatoes resistant to scab - this is almost an ideal solution to the problem, but be prepared for the additional costs. Domestic varieties such as Aspia, Ramensky, Vestnik, Zhukovsky Early, and Prasna are popular among summer residents. Their foreign counterparts will be somewhat more expensive: Alpha, Krostor, Mentor, and Lady Rosetta.
  • One and a half to two weeks before harvesting, allocate enough time to get rid of the tops of the tops.
  • At the end of the season, plant a site with rye, wheat, or peas. Thus, you greatly accelerate the recovery of the soil.
  • Ensure proper climatic conditions for storing the harvested crop. The worst enemies of potatoes are high humidity and high temperature.

These tubers are not suitable for seed.

Important! All types of potato scab are very “disliked” by specialized growth regulators, especially if they are used during budding. A good and not very expensive option is Zircon, which can be purchased at a specialty store. And if you still can’t prevent misfortune, use Phyto Plus, which should carefully treat all the existing potatoes intended for planting, and then sprinkle it several times (best of all - during the growing season, you will need 2-3 liters of water) bag).

If you follow all our recommendations, you will be able to cope with all the difficulties and provide yourself with potatoes for the whole year. The main thing is not to be afraid of difficulties, to believe in your own strength and devote some free time to the site. The common scab is not a sentence, it can and must be fought!

Watch the video: Potato harvest & Common Scab infection. Featuring a very Warty spud. (November 2019).

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