Cucumber leaves turn yellow in the greenhouse: what to do, how to process

Quite a few vegetable growers grow cucumbers in a polycarbonate greenhouse. At the same time, many of them are faced with the problem that the leaves of cucumbers turn yellow. Before processing cucumbers, you need to decide why the cucumber leaves turn yellow in the greenhouse and watch a video that describes how to solve this problem. This is the only way to get rid of yellowed foliage and protect the plant.

Causes of yellowing

There are different reasons for the yellowing of the leaves of cucumbers that are grown in greenhouse conditions. It is recommended that you familiarize yourself with them in advance in order to better understand how to deal with yellow sheets in the future.

Wrong watering

Quite often, the leaves on the bushes turn yellow in the greenhouse due to improper watering. It's no secret that cucumbers are moisture-loving vegetables, but this does not mean that they need to be watered very often. Particular attention should be paid to watering before fruiting. During this period, soil moisture should not be too high. It is because of the large amount of moisture that yellowing of the leaves may appear.

Another reason why the edges of the leaves turn yellow is watering with too cold water. If the temperature of the liquid is below room temperature, then the leaves of the cucumber seedlings will begin to dry out.

A considerable number of vegetable growers grow cucumbers in the open field. In this case, it is necessary to pour water under the stem. Spraying bushes under the sun can cause burns on the leaves. Cucumber seedlings should be watered early in the morning or evening to keep out the sun.

Bad lighting

Sometimes the leaves turn yellow at the edges due to the fact that they are grown in rooms with insufficient light. Poor lighting not only causes the leaves to dry out, but also negatively affects the overall growth and development of the bushes.

It is recommended to plant cucumbers according to a special scheme, with the help of which the plants will not shade each other. To prevent the leaves from turning yellow, you need to plant bushes at a distance of at least 80 cm.

There are times when the seedling leaves turn yellow at the edges due to the large amount of light. Most often this happens in the summer, when the sun can not only warm the plant, but also burn it.

Unstable temperature

No gardener is immune from sudden temperature changes. That is why, the leaves of cucumbers turn yellow and dry due to unstable temperature conditions.Even a greenhouse is not protected from such a problem, since night frosts can cause the temperature in the greenhouse to drop sharply.

To eliminate the yellow leaves, additional care must be taken to protect the cucumbers at night. For example, they can be covered with special materials, which include spunbond or agrotex.

Also, in cucumbers in the greenhouse, the edges of the leaves turn yellow due to the low temperature of the soil. It is recommended to grow bushes in soil that is warmed up to 20-25 degrees. At lower rates, the likelihood of leaf drying increases several times.

Soil composition

Problems in the leaves of cucumbers may appear due to the poor quality of the soil in which they are grown. When growing cucumber, it is recommended to use moist and loose soils that pass water well. It is also worth taking care of the nutrients that many plants need.If their number is not balanced, then the sheets may become covered with yellowish spots.

Most often, an imbalance of minerals appears due to very frequent watering, which can wash out all the important components from the soil.

Poor pollination

Another reason why leaves may start to turn yellow is poor pollination. This problem is most often found in plants that are grown in greenhouse conditions. To prevent the leaves from drying out, you need to periodically ventilate the greenhouse. This will allow insects to get inside and pollinate the bushes. Also, for the formation of ovaries, you can use such a tool as Ovary or Bud.

Diseases

Sometimes yellow leaves appear on cucumber bushes due to various diseases. Most often, this vegetable suffers from bacteriosis, tobacco mosaic, ascochitosis or peronosporosis. To prevent these diseases from harming cucumbers, it is necessary to take care of their prevention.To do this, all plants should be treated in advance with special biological preparations that are absolutely harmless to animals and people.

If the plant has already become infected and its lower leaves turn yellow, then the yellowed foliage is treated with Bordeaux mixture. Shrubs affected by bacteriosis or mosaic are not treated and should be disposed of immediately.

Pests

Quite often, mites and other insects are the reason cucumbers turn yellow. During the cultivation of cucumbers, it is recommended to take preventive measures that would protect the bushes from certain pests. To do this, you need to regularly treat the plants with Funafon, Aktellik and Aktara.

Ways to fight

Having decided why cucumber leaves turn yellow, you need to familiarize yourself with what methods are used to deal with such a problem. This is the only way to find out what to do if the cucumber leaves turn yellow in the greenhouse. Various drugs are used to combat yellow leaves.

Aktara

This tool belongs to the group of neonicotinoids, which are used to combat many pests. Therefore, it is recommended to use it if the plant has turned yellow due to pests.

Aktara is applied immediately after the appearance of the first insects on the bushes. To do this, you need to prepare a working solution consisting of a liter of water and 20-30 ml of the drug. It is recommended to use the mixture in the evening hours and in the morning, when there is still no strong wind and sun outside. In windy weather, you should not use the drug so that it does not accidentally get on other plants.

The tool is very effective, because literally half an hour after its use, insects stop eating and begin to gradually die.

Magic Capsule

If the leaves turn yellow due to decay products that have accumulated in the soil, then you should use the Magic Capsule.With its help, you can restore the ecosystem of the soil and cleanse it of various toxic elements. The composition of the drug includes a large amount of nitrogen, which can accelerate the growth of bushes several times. Also, this tool is often used to treat weak and thin seedlings.

To prepare the solution, one capsule is diluted in 40-50 liters of water. In this case, the prepared mixture should brew a little. You need to water the bushes with liquid 2-3 times a week until the soil ecosystem is fully restored.

Clonex

If the edge of the leaves began to turn yellow, you should use Clonex. With it, you can not only protect the bushes from diseases and pests, but also strengthen the tips of the leaves. All this is possible due to the fact that the preparation contains quite a lot of vitamins and other useful components. Use the drug once a week.

Gliocladin

Use Glyocladin if cucumbers turn yellow due to fungal infections. It was released specifically to fight pathogens of fungal diseases on cucumbers and other plants. To prepare the working mixture, one tablet must be dissolved in a liter of water. The resulting solution is added under each bush that needs processing.

Maxim

Fungicide Maxim can be used to protect cucumbers from diseases and insects. This drug is one of the most effective means in the fight against late blight, rhizoctoniosis and other diseases that may be accompanied by yellowing of leaves in cucumbers. This fungicide is versatile as it can be used on almost all plants.

Before using it, it is necessary to prepare the working mixture. To do this, 4 ml of the drug is mixed with two liters of water, after which the liquid is infused for 30-40 minutes. After that, the mixture can be used to spray bushes.

Folk remedies

Also, many people use various folk remedies to combat yellowing of foliage.

Pepper

Many folk remedies are prepared from various vegetables. In this case, the main ingredient for preparing the mixture is capsicum. 40 g of vegetable and 150 g of tobacco dust is mixed with a bucket of boiled water. Then the liquid is infused for 12 hours and filtered. After that, wood ash with liquid soap is added to it. The resulting mixture is very effective against mites or aphids.

Bread loaf

Some vegetable growers even use a bread loaf to combat yellow leaves. From it you can make a mixture that will help get rid of fungal infections. To prepare the solution, a loaf of gray bread needs to be soaked for a day in 10 liters of water. In the morning, a little iodine is added to the liquid container.The mixture is thoroughly mixed and distributed into liter jars. Before spraying, one jar of liquid should be added to a bucket of water, mixed and used to treat bushes.

Whey

This mixture is very effective in fighting fungal diseases that can harm cucumber leaves. It is recommended to use it immediately after the first signs of the disease appear. To prepare a working solution, you need to add 2-4 liters of whey to 10 liters of water. All this is thoroughly stirred and infused for half an hour. Then 100 g of sugar is poured into the liquid, which is needed to improve the formation of new ovaries.

Conclusion

Many do not know what to do when the leaves turn yellow on the cucumbers in the greenhouse. To do this, you need to familiarize yourself with the causes of this problem and see the photo and video, which describes in detail the process of processing cucumbers.

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