Root rot in cucumbers: how to treat, folk remedies and preparations

Cucumber root rot leads to significant crop losses in greenhouses. Our advice will help summer residents pay attention to dangerous symptoms in time, understand their causes, and choose the best way to fight. The information is especially useful for beginner gardeners who have unheated greenhouses or greenhouses.

Root rot pathogens

Root rot on cucumbers is caused by a fungus from the genus Fusarium. Fungal infection can affect plants of any age. The disease is most often focal in nature, spreads with soil and seeds. In some cases, the nature of the infection is not fungal, but bacterial.

Weak plants are prone to infection. Excessive humidity of the air and soil provokes a fungal disease. Summer residents of any climatic zone may encounter this disease. If the vascular system of the plant is affected by the fungus, then the plant develops Fusarium wilt. Infection in the tissues of the root system causes rotting of the root part of the plant in the soil.

Fungal infection can persist for a long time in the soil. Leaving unharvested plant residues in greenhouses, greenhouses, summer residents contribute to the occurrence of root rot of cucumbers in subsequent seasons and the gradual accumulation of fungal spores and other infections in the soil.

By what signs do gardeners recognize the root rot of cucumbers

Let's figure out what signs can be used to calculate root rot in cucumbers. On seedlings, signs of root rot are extremely rare. Symptoms appear after transplanting cucumber seedlings into a greenhouse or soil. Sluggish leaves on cucumber lashes - a reason to think.

The mistake is made by the summer resident who runs after the watering can and waters fading plants in large volumes. Always check the roots of cucumbers before watering. You need to make sure there is no root rot. To do this, carefully remove the soil from the stem with your hand and slightly go deeper into the ground in the area around the stem.

Cucumbers are affected by root rot with the following symptoms:

1. The stem at the base becomes thinner, acquires a yellow or brown tint.
2. The plant has cracked at the bottom of the central shoot.
3. The roots of the cucumber are turning brown and beginning to soften.
4. Yellowing of the leaves in the lower zone of the stem.
5. Frozen, fading ovaries (advanced stage).

The presence of these signs in plants indicates that cucumbers have root rot and treatment should begin immediately.

Causes of diseases

Knowing what can cause the development of root rot, you can avoid infection in the future, leading to the rapid death of cucumber bushes. Here is a list of factors that cause root rot of cucumbers in a greenhouse:

• violation of crop rotation;
• lack of autumn-spring tillage and structures in the greenhouse;
• acquisition of fungus-infected seeds for cucumber seedlings or when they are sown in the ground;
• contaminated soil;
• overwatering;
• damp, cool weather;
• cold water for irrigation;
• daily fluctuations in air and soil temperatures;
• high air humidity due to poor ventilation of the greenhouse.

Water rate - 4 - 5 l / m² before flowering, 9 - 12 l / m² during the formation of ovaries (fruits). The optimum water temperature for irrigation is 25 °C.

Mechanism of infection

There are many ways for a fungal infection to enter a greenhouse. The fungus can be brought by the summer resident himself on shoes or along with the soil, renewing the topsoil. The infection can accumulate in the soil for years. As a sacrifice, she chooses a weakened plant - a cucumber, which received a mechanical injury when transplanted into the soil or during care.

Ways to deal with rot

Let's try to figure out how to deal with root rot. It is necessary to stop watering the diseased plant, apply folk remedies.

Folk methods to fight rot

In the summer cottage you can always find chalk, coal or ash. Sprinkle the root neck, the bare part of the rhizome and the base of the stem with these powdered substances. They will help dry the wounds and stop the spread of infection, slow down decay.

Chatter prepared according to a simple recipe will save plants from root rot. For its preparation, you need chalk - 3 tbsp. l., blue vitriol - 1 tsp, water - ½ liter jar. Lubricate the lower part of the stem and the upper root part with the resulting solution.

Chemical preparations for rot

If the cucumber bushes turn yellow and there is a strong wilting, only folk remedies are indispensable. We'll have to resort to chemical pesticides. Stick to the following pattern:

1. When cucumbers show signs of severe wilting, dilute 20 ml of Previkur pesticide in 10 liters of water, pour over the cucumbers.
2. After 5 days, apply watering with Fitolavin solution, prepared from 20 ml of product and 10 liters of water.
3. Treat the soil in the greenhouse from the fungus with preparations "Gamair" and "Alirin-B". Processing is necessary to restore the beneficial microflora that has suffered from the use of chemicals.

Biopreparations for cucumber rot

Bacterial preparations can be used to treat rot in cucumbers. You can purchase Alirin-B. The remedy is produced in the form of tablets, it does not accumulate in fruits and leaves, it is not dangerous for humans.Purpose - the fight against various kinds of fungi. In plants treated with this agent, the level of nitrates decreases, the content of ascorbic acid in cucumbers increases.

Greenhouse plants can be treated with the fungicide "Gamair", which is available in powder or tablet form. The biological product helps with many types of fungus. It is used not only to treat the manifestations of the disease in greenhouse cucumbers, but also to disinfect the soil in a greenhouse, greenhouse or open field. A rotten root can be treated with a Gamair solution prepared from 5 liters of water and 1 tablet.

Stop cucumber rot treatment with "Gliocladin", an effective microbiological fungicide. It helps especially well with Fusarium of plants planted in soil fertilized with organic matter in excess of the norm.

Practically all biological products can be combined with insecticides and mineral fertilizers, humates. These formulations are easy to use, water soluble, can be sprayed on leaves and applied to the soil using greenhouse drip irrigation systems.

Prevent plant infection

Prophylaxis should be started in early spring by treating the seeds before planting, because one of the ways the infection spreads is poor-quality planting material.

The easiest and most affordable way to disinfect (seeds, soil) is a solution of potassium permanganate. This is an old and time-tested method, but for reliability, you can purchase the Fitosporin preparation and treat the seeds with it before planting. This is much better than treating root rot in cucumbers.

Potassium permanganate and Fitosporin can be used to treat planting soil. Do this not on the day of planting, but a week or two before. Soil disinfection will save cucumbers from many diseases and pests.

Proper greenhouse care

Annual autumn cleaning of the greenhouse prevents the accumulation of harmful fungi in the soil and structural elements. Mandatory building maintenance activities:

1. Processing wooden structural elements with copper sulphate.
2. Using a laundry soap solution to wash metal and galvanized parts.
3. Wash greenhouse glass or polycarbonate with soapy water and rinse with a hose.
4. Carefully remove all plant debris, mating and other functional debris that has accumulated in the greenhouse over the summer.

If there were sick plants in the greenhouse in the summer, in the fall you can disinfect with a sulfur bomb, given the fact that beneficial microorganisms in the topsoil die in the same way as harmful ones. In the spring, to restore the microflora, treat the soil with any modern biological product.

Follow the cucumber planting pattern

Don't forget about crop rotation. If you plant the same vegetable crop in the same place every year, an infection will accumulate in the soil - an outbreak of the disease is inevitable.Reuse of the plot for cucumbers is possible only after 3 years. In greenhouses, the top layer of soil is changed every two to three years. They take soil from the beds where the following plants grew:

• bow;
• early cabbage (white);
• garlic;
• salads;
• beets;
• potatoes.

Failure to follow the manufacturer's recommended planting pattern for cucumbers is the most common mistake of summer residents. Chasing a large harvest, cucumbers are planted too thickly, provoking diseases. Due to the close location of the bushes, both pests and diseases spread through them at high speed. It is very difficult to process dense plantings, even early diagnosis of diseases is difficult.

What diseases of cucumbers do summer residents need to know

Difficult weather conditions, poor agricultural practices, lack of nutrition are the main causes of diseases leading to reduced yields and even death of plants. In cucumbers, both greenhouse and ground, there are diseases:

• powdery mildew and downy mildew;
• grey and white rot;
• fusarium;
• olive blotch;
• copper;
• mosaic;
• leg rot.

Powdery mildew outbreaks usually occur in wet weather, accompanied by a decrease in daily air temperature. At first, a white coating can be seen on the surface of the leaves.

The leaves affected by the fungus turn yellow and dry out. Spores persist on plant debris and in the soil. Spores are easily carried along with the movement of air.

Helps to cope with the yellowing of the leaves infusion of mullein. Strain 1 liter of infusion and add 1 tbsp. l. urea. After complete dissolution of the fertilizer, the solution can be sprayed with powdery mildew-infected cucumber bushes. Yellow leaves should be removed and destroyed.

From downy mildew leaves of plants suffer. Brown spots can be seen on the outer surface, and a gray-violet coating on the lower part. As a result, the plant loses leaves, which dry out and fall off.

Recommended measures to prevent downy mildew:

1. Exclude drafts in the greenhouse.
2. Feed with potassium and phosphorus, introducing them into the soil.
3. Ventilate the greenhouse to maintain the required air humidity.

You can treat plants with drugs. Help "Topaz" and "Oksihom". Solutions must be prepared according to the instructions supplied with the preparations. After treating the plants with a solution of the drug, the soil under them should be sprinkled with ash.

You can absolutely name the causes of olive blotch in plants:

• drafts;
• high soil moisture;
• using low temperature water for irrigation;
• low temperature (air, soil).

A sign of plant infection is dry sores that appear on cucumber lashes. They are covered with an olive color. The leaves suffer from a fungus, covered with spots with a light brown color. Cucumber skin becomes uneven due to olive-colored dents. The dents gradually turn into irregularly shaped ulcers.

Olive blotch in plants needs to be treated in the system. You need to stop watering the diseased plant. The next stage of treatment is the processing of leaves and stems in cucumbers. Processing can be carried out with the help of 1% Bordeaux liquid or another Oxyhom, popular with summer residents. An aqueous solution is prepared from Oxychoma: for 10 liters of water, 20 g of the product.

Fusariosis is found in the soil. It enters the stems through the root system. The first visible signs of infection in cucumbers are withering leaves at the bottom of the stem. Later, the leaves located higher up the stem turn yellow.

At the last stage of the cucumber lash disease, the leaves become very thin and turn brown. The plant dies. It is impossible to cure a cucumber. The bush must be destroyed by burning. Fusarium of plants is better to prevent than to treat. To do this, you need to sow only pickled cucumber seeds in fungicide-treated soil.

Gray mold is spread through the air or liquids by spores of the fungus Botrytis cinerea Pers. Factors affecting the degree of plant damage:

1. Sudden change in air temperature from high to low.
2. Using cold water to water plants.
3. Lack of ventilation, humid air, condensation on leaves and stems.

You can identify the disease by the appearance of cucumbers: weeping, brown spots are visible on the fruits.Diseased plants have cucumber lashes with signs of decay, leaves with brown spots. The affected areas of the plant become gray from plaque after some time. Plaque is fungus spores that spread through the greenhouse in a draft, infecting he althy plants and soil.

You can stop the development of a fungal infection, prevent the plant from rotting. To do this, prepare a powder: 1 tsp. copper sulfate, 1 glass of ash. With this powder, powder the areas of stems and leaves affected by the fungus. The soil under the plants can be sprinkled with ash. To reduce air humidity, you need to regularly ventilate the room with plants. If the measures do not give a positive result, you will have to remove the damaged parts of the plants and destroy them.

Spores of the fungus (Sclerotinia sclerotiorum) living in the soil infect the root zone of the stem. Moist spots form on the stem, overgrown with white mycelium. The infection gradually covers the entire plant, affecting the fruits.

As a preventive measure for white rot, it is recommended to monitor the level of humidity in the greenhouse. Mulch the soil in the greenhouse with dry grass. At the initial stage of the disease, lubricate the areas of plants affected by the fungal infection with a paste prepared from chalk, potassium permanganate, and water. In advanced cases of the disease, remove diseased plants along with a clod of earth.

The leg of a cucumber rots if the bush is infected with a bacterial infection. At the initial stage, you can try to save the plant by sprinkling the affected area with wet peat. Watering cucumbers should be carried out carefully - so that water does not fall on the lashes and leaves. In case of a large number of damages, it is better to destroy the cucumber bush.

Copperhead - a fungus that affects the leaves and fruits of the plant. In the initial stage, brown spots form on the leaf plates, which eventually increase, blacken, dry out and crumble.

Cucumbers affected by the fungus are not suitable for consumption due to brown dents 3 - 7 mm in diameter. Pathogens of cucumber verdigris persist in a 10 cm layer of soil and spread through seeds obtained from the fruits of diseased plants.

Mosaic on cucumbers

Mosaic virus can remain active in the soil and on the roots of weeds. Virus-infected cucumbers can be identified by yellow, twisted leaf plates. The fruits are covered with yellow spots, the lashes of the plants are cracking.

Transmits aphid mosaic virus between plants. The fight against aphids is the main preventive measure against the mosaic on cucumbers. In addition, you need to keep the soil of the beds clean - regularly remove weeds and loosen the aisles. The mosaic of plants is treated with Actellik and Aktara preparations.

Conclusion

Now you know what to do when the first symptoms of the disease appear on greenhouse cucumbers, why the stems of plants rot, the roots of cucumbers in the greenhouse rot and what effective drugs should be used to cure diseased plants.

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