Brown spots on cucumber leaves: how to treat, control measures

Cultivation is not only about watering and weeding. You should carefully monitor the appearance of plants. The appearance of various spots on cucumbers says a lot. Understanding the reasons is not so easy.

How to treat brown spots on cucumber leaves?

Unambiguous answer to this question will not work. Because there is more than one reason for them. It is necessary to carefully look at the appearance of the spots and determine their features. Only then decide what methods to fix the problem.

Cladosporiasis

Fungal disease, another name for cucumber olive spot.Rounded spots of an angular shape are formed throughout the sheet. When dried, the structure of the leaf inside the stain is destroyed. The whole plant is covered with ulcers, they have an olive tint. The spot is noticeably expanding already on the 3rd day. The infection affects young fruits, they become crooked and covered with spots.

A favorable environment for the spread of disease is:

Rain.
Cloudy cool weather.
Sudden temperature fluctuations.
End of the growing season as the nights get colder and more dew falls.

Pedlars:

Wind.
Water.
Rain.

The peculiarity of the disease is that the infection persists for a long time in the soil and plant residues.

The spread of the disease can be limited, just follow a few simple steps:

Cucumbers should not grow in one place more than once every 4 years.
Water only with warm water, under the root.
Feed cucumbers in a timely manner.
Remove all plants and vegetables from the beds without leaving them in the garden.
When growing in a greenhouse, constantly ventilate.

If cucumbers have cladosporiosis, then the bushes should be immediately processed. But first, stop watering for 4-5 days. It is desirable that the temperature be +20 ⁰С, if it is lower, then you can cover the beds with material, and close the greenhouse well at night.

The ways of fighting are varied:

Spraying the bushes with Bordeaux liquid. Solution at a concentration of 1%.
03-04% copper oxychloride solution. Processed 3-4 times per season, break 10-12 days.
Fumigation with sulfur dioxide, for 2 days (in a greenhouse).
Spraying bushes with iodine chloride.
Processing with serum with water solution 110.

Ascochitosis

Large brown spots form on the leaves of the plant, gray-white spots on the stems. It affects young ovaries, and large cucumbers, as a result of which they rot. The disease occurs and develops under adverse weather conditions.

Prevention measures.

Spraying bushes with infusions of tobacco, tomato and potato tops, onions, garlic.
Wood ash dusting.
For 10 liters of water, 30 drops of iodine, 1 liter of milk and 30 g of soap. Once every 10 days.

When affected by a disease, you should:

Treat with a 1% solution of Bordeaux liquid and a suspension of copper oxychloride 0.3%.
Prepare a weak solution of copper sulfate. Take 5 g of the substance and dilute with 10 liters of water. 10 g of urea is also added there.

Grey Rot

The defeat of this disease is characterized by the appearance of brownish spots on the leaves, covered with a gray bloom. Shoots begin to rot, leaves dry, necrotic spots appear.

Distribution medium:

Damp cloudy weather.
High humidity.
Low temperature.

Bacteria can spread:

Wind.
Contaminated soil.

Prevention is:

In observing crop rotation.
Processing planting material.
Remove all plant debris from the beds.
A selection of disease-resistant varieties.

Processing is carried out in several ways. The decision remains with the summer resident, or use chemicals, or use folk methods.

Control measures:

Fungicide treatment.
Trichodermin, a biochemical remedy.
10 l of water + 300 g of wood ash + 300 g of chalk + 1 teaspoon of copper sulfate. Treat 2 plants with this volume.

Anthracnose

The second name is copperhead. Depressed spots appear on the stems. This prevents the nutrients from moving forward. As a result, the plant dries up and dies, while infecting all nearby bushes. The speck that appeared on the leaf is yellow, with a brown tint.

Favorable conditions for the development of the disease:

High humidity.
Heat temperature.
Lack of potassium and phosphorus.
Increased soil acidity.

Prevention work:

Feeding with complex preparations.
Control soil moisture.
Treatment against pests.
Treatment with weak solutions of fungicides.
A selection of varieties that are immune to the disease.
Seed dressing.

How to deal with developing disease:

Use a 1% colloidal sulfur slurry solution.
Also 1% solution of Bordeaux mixture.
0.5% copper sulfate solution. After processing, be sure to dust the plants with chalk, coal, lime.
Preparations "Tsineb", "Tsiram".

Bacteriosis

Holes form on the leaves, and sores on the fruits. The disease is bacterial, carried by insects or by water. Dark brown spots form on the outside of the leaf. The fruits are deformed. Spreads during periods of high humidity, temperature changes.

What to do to avoid infection:

Do not plant a crop more than once every 4 years in one place. In case of urgent need, it is necessary to remove the top layer of soil.
Treat seeds.
Remove infected fruits and leaves from plants.

Treatment is carried out with the help of chemicals. Also treated with Bordeaux mixture or copper chloride.

General measures to prevent the development of the disease

Nothing helps so much in this difficult task as the advice of experienced summer residents who are faced with illnesses. General measures for the prevention of all these and other diseases are to follow simple recommendations.

It is easier to prevent the development of viruses and infections than to treat plants.

Prevention measures:

First of all, adjust the watering method, it is best to use drip irrigation, or watering directly under the root.
More attention is paid to soil moisture. Its lack, as well as surpluses, lead to the fact that various diseases begin to develop.
Water time outdoors in the evening after sunset, in the greenhouse in the morning.
Compliance with the ventilation mode when growing in protected ground.
A culture that grows from year to year in one place is much more susceptible to disease.
Feeding is better to use complex, this will increase the overall tone of the bushes and increase resistance.
When growing in a greenhouse, constant processing and disinfection of the room is required.
Tools used in the work are disinfected without fail.
Temperature for he althy development of culture +20⁰С. When lowering it, cover material should be used.

Fertilizers

Not always the presence of any external abnormalities in a plant indicates the development of a disease. Often the reason is the lack of minerals in the composition of the soil.

Feeding the plant is required regularly, in addition to the introduction of organic dressings, solutions containing potassium and magnesium are used.

Excess copper causes the plant to develop brown spots on the leaves, they begin to fall off.

Choice variety

The main advantage of the modern gardener is the abundance of choice of crop varieties. You can choose such characteristics of the species that satisfy the requirements of the family.

In order not to suffer from constant struggle and preventive treatments of bushes, you can purchase special varieties. They are most often hybrid, resistant to major diseases. But it should be remembered that collecting seeds on your own will not lead to anything. Since such varieties do not retain the hereditary genes of their parents.

The fruiting of many species does not depend on climatic conditions. They set fruit even in bad weather.

The appearance of spots on the leaves of a cucumber indicates that the plant needs something. Before proceeding with the treatment of all diseases or start mindlessly feeding the bushes, they understand the reasons for their appearance.