Peronosporosis of cucumbers: treatment with folk remedies, photo control measures

One of the most common vegetable diseases is cucumber downy mildew. Treatment of this disease should be carried out immediately after its appearance. If this is not done, then over time the yield of cucumbers will decrease and the plant will die.

Description

On the leaves of plants that suffer from downy mildew, small yellow oily spots form. They are limited to veins and have a rounded shape. Over time, the lower part of the leaves becomes covered with a purple bloom. Gradually, the spots on the leaves begin to increase and merge. Because of this, they dry out, wrinkle and crumble.After the leaves die, the development and setting of cucumbers slows down, the fruits lose their former juiciness and rich taste. Left untreated, downy mildew on cucumbers can completely destroy the plant in a short amount of time.

Peronosporosis is a rather dangerous disease, as it can harm not only cucumbers, but also other cultivated plants. They can infect shrubs, trees, vegetables and even houseplants. The spread of the disease is facilitated by various insect pests - aphids or whiteflies. Therefore, if these pests were noticed on cucumbers, you must immediately take measures to eliminate them.

Reasons for appearance

To infect a plant with downy mildew, there must be certain conditions - heat and high humidity. There are also other factors that contribute to its emergence and development:

• regular watering cucumbers with too cold water;
• poor greenhouse ventilation system;
• strong temperature fluctuations;
• protracted downpours, which increase the humidity of the air;
• a lot of weeds near the plants.

In dry weather, downy mildew is very rare in cucumbers. It quickly infects the plant only under favorable conditions. Quite often, because of this, another disease of cucumbers appears - bacteriosis.

Methods of protection

Cucumbers can be protected from the appearance and spread of downy mildew in various ways.

Main recommendations

There are several basic recommendations that will help prevent cucumber downy mildew:

• Planting seeds should be in places where it will be quite difficult to get infected with downy mildew. Planting should be carried out in areas with previously cultivated soil.
• After harvesting the fruit, it is necessary to disinfect the soil and get rid of the remnants of the plant.
• During the growing season, it is necessary to monitor soil moisture.
• It is recommended to grow varieties with resistance to downy mildew. These include the Zodiac, Debut, Idol, Rodnichok and Photon.
• When growing cucumbers in a greenhouse, you need to monitor the microclimate in it to avoid dripping moisture on the leaves.
• The soil should be regularly fertilized with organic and mineral substances that increase the resistance of cucumbers to various diseases.
• If some bushes are already infected with downy mildew, they should be destroyed immediately. This will prevent the disease from spreading to other plants.

Soil care

The site should be regularly cleared of fallen leaves, in which zoospores can develop. Also, the ground must be periodically disinfected and dug up to a depth of about 35-40 cm. If the bushes were infected in the previous year, then it is better to repeat the digging in the spring.

Soil disinfection is carried out using a 1% solution of potassium permanganate and a 3% solution of copper sulphate. You need to use these mixtures very carefully, as they can harm not only pathogenic, but also beneficial microflora.

In the garden, it is imperative to observe the crop rotation. It is possible to return the culture to its original place only after 4-5 years. If you plant cucumbers in the same place for several seasons, then an accumulation of bacteria and infections can occur. This increases the chance of contracting downy mildew.

Plant care

In order for cucumbers to be more resistant to diseases, they need to be properly planted. Before planting, seed disinfection should be done. This can be done using heat treatment. To do this, the seeds are heated to 35-40 ° C for 15-20 minutes. Cucumber seedlings can be treated with a weak 0.1% solution of potassium permanganate. In this case, its roots are lowered into the mixture for several hours.

During the growing season it is necessary to monitor the spread of weeds. You also need to regularly get rid of plants that can no longer be cured of powdery mildew. First they should be dug up and then burned.

Peronosporosis drugs

Quite effective means of combating peronosporosis are chemicals.

Acrobat MC

Used to treat and prevent disease. Acrobat MC contains two active ingredients that belong to cinnamic acid amides - dimethomorph and mancozeb. They have a local-systemic action that protects cucumbers inside and out.

Before using the preparation, it is necessary to prepare a working solution. To do this, add 50 g of Acrobat MC to 10 liters of water. The first treatment can be carried out even in the absence of signs of downy mildew of cucumbers.

This will be an excellent prevention to protect the bushes from the disease. The second spraying should be carried out two to three weeks after the first.

It is better to process in clear and calm weather so that the drug evenly falls on the bushes and is not sprayed on neighboring plants.

Alirin B

It can be used to treat downy mildew and other fungal diseases. It also reduces soil toxicity after the use of hazardous chemicals and restores soil microflora.

To prepare a working solution for watering bushes, two tablets of the drug are added to 10 liters of water. When spraying cucumbers, you need to use a different mixture. For its preparation, one tablet of Alirin B. should be added to each liter of water.

This product has excellent compatibility with other products, so it can be used with growth regulators, fungicides and insecticides.

Gliocladin

It is used during the prevention of bacterial and fungal diseases. The active substance of the drug is a fungal culture of Trichoderma. When this substance enters the cells of the disease, it begins to dissolve them from the inside. This blocks the further development and spread of downy mildew.

Gliocladin is not used for spraying bushes, but for soil treatment before planting cucumbers. The drug should be placed in the upper layers of the soil, since it is there that the best conditions for trichoderma. When planting seeds in the hole, add no more than two tablets of Glyocladin. It is recommended to use gloves while working with the drug.

Oxychom

This systemic contact fungicide is excellent for protecting cucumbers from LMR. It destroys pathogens in all stages in the shortest possible time. Oxychoma contains copper oxychloride, which kills all vital components of peronosporosis cells.

To prepare a working solution in 5 liters of water, add 15 g of the drug. The mixture should be applied to the bushes in sunny and calm weather. You need to spray cucumber bushes at least three times per season. The interval between treatments is about 10-15 days.

Oxychom cannot be used in parallel with other products that should not come into contact with an alkaline environment.

Ordan

The drug is available as a powder, which can be sold in packages weighing from 1 to 10 kg. The composition of this tool includes two active substances with which you can get rid of peronosporosis:

• cymoxanil - it slows down the synthesis of ribonucleic acids;
• copper oxychloride - disrupts the enzymatic system.

When processing cucumbers, it is recommended to use a 0.025% solution. For its preparation, 25 g of the drug should be added to 10 liters of water. It is necessary to spray the bushes immediately after the first symptoms appear. It is impossible to store the working solution for a long time, as it quickly deteriorates.

Ordan is not recommended for use with preparations that contain alkali. It can be combined with other fungicides and pesticides. However, compatibility must be checked before mixing. If they are not compatible, then a precipitate will appear in the solution.

Quadris

During the spraying of the bushes, this agent enters the leaf plate and protects it from pathogens. The main active substance of Quadris is azoxystrobin, which destroys pathogens.

For processing it is recommended to use 0.2% or 0.1% working solution. In one season, you need to spray the bushes at least three times. It is necessary to do this in the evening or morning, when there is no strong wind.

Folk remedies

In addition to the use of chemicals, there are other measures to combat downy mildew on cucumbers. You can get rid of this disease in cucumbers with various folk remedies.

Soda

To prepare a soda solution, add 40 g of soda and 15 ml of liquid soap to 5 liters of boiled water. All components should be thoroughly stirred until they are completely dissolved. After that, you can start spraying the soil and bushes. The procedure must be carried out 4 times per season. The interval between treatments should be about one week.

Milk

To prepare a milk solution, 40 drops of iodine and 35 g of rubbed laundry soap are added to a liter of milk. You need to use this tool throughout the entire period of growth of cucumbers. Spraying should be done regularly, every 10 days.

You can also make whey. To do this, several liters of milk are added to a bucket of water, after which the mixture is heated to a temperature of +25 degrees. Serum can be used not only to treat already infected bushes, but also he althy ones.

Onion peel

This medicine is very effective in the early stages of the disease. To prepare it, 500 g of husks are added to 10 liters of water. The resulting mixture is boiled over low heat and infused for several days. It is recommended to spray cucumbers several times a month.

Conclusion

Peronosporosis is a rather dangerous disease that can lead to the death of plants. Get rid of downy mildew on cucumbers immediately. To do this, it is enough to familiarize yourself with the most effective ways to deal with it.

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