Yellow spots on cucumber leaves: what to do and how to treat

Cucumbers can be found in almost any vegetable grower's summer cottage. It is quite difficult to find a person who does not like fresh cucumbers. During the cultivation of this vegetable, some are faced with the fact that yellow spots appear on the leaves of cucumbers. Therefore, before growing, it is recommended to learn how to cure yellow spots in cucumbers.

Why cucumber leaves change color

Before treating yellowing, you should figure out why yellow spots appear on the leaves of cucumbers. There are several common causes for this problem.

Nutritional deficiency

The main reason for leaf discoloration is a lack of magnesium or potassium. Because of this, red and dry spots begin to appear on the plant. At the same time, only the edge of the leaves is affected at first, and the rest of them begin to turn yellow only after a few days.

With a serious lack of magnesium, the leaf blades between the veins are first affected. The lower leaves are the first to change their color, and only after that the lower leaves of cucumbers are covered with spots.

If the problem arose due to a deficiency of nutrients, then you should use a healing onion infusion. To prepare it, 100 g of husk is added to 10 liters of water. Then all this is thoroughly mixed and boiled for about 20 minutes. When the prepared mixture has completely cooled, you can begin the treatment of cucumbers. Each bush is treated with a liter of prepared infusion.

Peronosporosis

Spots on the leaves of cucumbers in the greenhouse and on the street may appear due to powdery mildew. To find out that the plant turned yellow precisely from peronosporosis, you should study its main symptoms. When this disease occurs, only the lower part of the bushes suffers first.It has a faint gray coating with a slight purple tint. A few days after the onset of the disease, spotting begins to spread to the entire bush.

The leaves gradually dry out and over time, because of this, the plant may die completely.

Most often spots on cucumber leaves due to powdery mildew appear when grown in conditions of high humidity. Therefore, before treating yellow spots on cucumber leaves, you should lower the humidity level.

To protect cucumbers from peronosporosis it is necessary:

• water the bushes with heated and settled water;
• harvest ripe crops in time;
• monitor crop rotation.

When the first signs of the disease appear, you should immediately stop watering the plants and treat them with Bordeaux mixture. You can also use polycarbacin during treatment.

Cladosporiasis

Sometimes, the leaves turn yellow due to the fact that the plant suffers from cladosporiosis. This fungal disease of cucumbers has pronounced symptoms and therefore it is quite easy to distinguish it from other diseases.

At the initial stage, small rounded dots appear on the sheets. At first, their size is only 1-2 mm, but after two days they begin to increase and dry. At the slightest touch of the hand, the inclusions that have appeared are destroyed.

For the prevention of cladosporiosis it is necessary:

• plant cucumbers in a new place every year;
• regularly ventilate the cucumbers in the greenhouse;
• when watering, use only heated water;
• before planting cucumbers, completely clear the site of the remains of plants that were grown on it earlier.

If yellow spots have already appeared on the plants due to cladosporiosis, then you should immediately stop watering for a week. For treatment, it is recommended to use foundationazole or Bordeaux liquid.

Anthracnose

Yellow spots on cucumbers in the greenhouse and in the garden, often appear due to anthracnose. Most often, anthracnose appears due to the fact that non-disinfected seeds were planted. Also, the plant can become infected due to the fungus in the soil.

When this disease appears on cucumbers, several blotches of red color can be seen near the veins. Literally 2-3 days after infection, the leaves begin to dry quickly, and dark ulcers appear on the fruits.

Get rid of the disease is quite simple. To do this, once a week, treat the plants with Bordeaux mixture and a weak solution of copper sulphate. Some growers then sprinkle lime or charcoal on the cucumber bushes.

Field mosaic

There are times when cucumber seedlings begin to gradually turn yellow due to field mosaic infection. This disease equally often appears both in greenhouses and in vegetable gardens. On each leaf of bushes infected with this disease, at least one speck of yellow appears near the vein.

If nothing is done, then over time the entire bush becomes covered with such spots. This reduces the number of flowers, which worsens the yield. To cure the field mosaic, it is enough to treat the bushes with whey several times a week. The procedure is carried out until the leaves begin to recover.

How to treat yellow leaves

The fight against yellow spots on cucumber seedlings is carried out with the help of special preparations that help treat certain diseases of cucumbers. Therefore, before treating cucumber seedling disease, you should familiarize yourself with the most effective drugs.

Topaz

With the help of this fungicide, you can quickly get rid of fungal diseases, due to which the leaves of cucumbers are covered with specks. Also, this tool is often used to prevent these diseases. The main advantage of Topaz is that it is non-toxic and therefore it cannot harm human he alth in any way.

This tool is produced in various forms. Most often it is sold in the form of a blue powder or liquid solution. When using a powder, you will have to prepare a working solution. To do this, 10 g of the drug must be mixed with 10 liters of water. At least two liters of the mixture should be consumed per ten square meters of the site.

Hom

Some vegetable growers, after the cucumbers began to become covered with yellowish spots, use Hom.Most often it is used as a replacement for Bordeaux liquid. This tool is very effective in the fight against many different fungal diseases. The composition of the drug includes copper oxychloride, which has a contact effect. When this substance gets on the surface of the leaves, it prevents pathogens from penetrating the plant tissue.

Hom is sold in the form of a green powder, which must be dissolved in water before use. To do this, 30 g of the fungicide is mixed with 5-7 liters of water and infused for half an hour. It is recommended to use Hom once a week in calm weather. If spots appear on almost every leaf, then you need to use the mixture more often.

Zircon

You can get rid of emerging spots with a yellowish color using Zircon. This drug not only protects young bushes from diseases, but also activates their growth.Zircon can be used at any stage of cucumber development. Many vegetable growers use it even during seedbed preparation, before planting in greenhouses.

The product is absolutely safe for people, since it does not contain any chemical components and the drug consists only of elements of plant origin.

Before you cure the yellowing of the leaves, you should prepare the working mixture. To do this, the container is filled with 2-5 liters of water, after which 25 g of the drug is added to it. Then the mixture is mixed and poured into a ten-liter bucket of water. The finished substance is used once a week until the bushes are fully restored.

Oxychom

If the cucumbers have small brown spots on the leaves, then you should use Oxychom. With it, you can protect plants from various diseases or cure them.The main advantages of the drug include its long therapeutic effect. Having used this remedy for yellow spots several times, you can forget about the fight against them for a long time. After penetrating the leaves, Oxychom acts on almost all the most important components of the fungal cells that led to the yellowing of the leaves.

The drug is sold in powder form, and therefore, before use, it is worth preparing a working solution. 20-40 g of the drug is added to the filled ten-liter container. All this is thoroughly mixed and poured into smaller containers. The remedy is applied once every two and a half weeks.

Conclusion

Many vegetable growers don't know what to do with yellow spots on cucumber leaves. To prevent yellowing, you should familiarize yourself with the main causes of their occurrence and the means to help get rid of them.

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