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One of the most common pepper varieties is bell pepper, which is often used in various dishes. This vegetable often suffers from various diseases that lead to lightening of the leaves growing on the bush. To get rid of the white leaves, you need to figure out why the leaves of the pepper turn white.
The main causes of the problem
There are several reasons that lead to the fact that the leaves of pepper seedlings change their color or begin to turn white. The main reason for the occurrence of such a symptom is the appearance of a particular fungal disease.
The most common fungal disease faced by most growers during greenhouse cultivation of pepper seedlings is blackleg. This disease can destroy most young seedlings. Especially if they are planted in a greenhouse with poor lighting and high levels of humidity.
Fungal infection spreads with the help of plant debris, poorly disinfected soil or untreated seeds. The main symptoms of a black leg include:
- the leaves on the bush brightened and ceased to be green;
- the root collar darkens;
- decay of the plant stem.
The disease affects not only pepper seedlings, but also an adult plant that grows in a greenhouse. During the defeat of adult bushes, their stem gradually turns dark brown.
Sometimes the manifestations of this disease strongly resemble the symptoms of a cucumber mosaic. These diseases are very similar, as they disrupt the work of the vascular system of plants. The main symptoms of verticillosis include:
- the plant grows slower;
- pepper leaves shrink and turn pale;
- over time, the leaf plate of the lower leaves turns yellow;
- if young bushes were infected, then ovaries cease to form on them;
- plants infected later in growth will shed their leaves.
The disease damages the leaves of peppers, their fruits and stems. The fungus develops actively if cultivation is carried out in a greenhouse with a temperature of about 25 degrees and an air humidity of more than 80-85%. Septoria blight first affects the lower part of the plant, causing old leaves to suffer first. White spots appear on them and over time, some of them crumble.
Then septoria rises higher and higher and affects the younger leaves. In this case, the number of spots increases significantly. They appear at all veins of the leaf plate.
When the first white spots appear on the sheets, it is necessary to treat them with special preparations that contain copper.
This disease manifests itself not only on the surface of the leaves of peppers in the greenhouse, but also on the fruits. At first, small specks with a brownish tint are formed on them. Over time, they appear on the leaves that are located above. They gradually increase and begin to merge. If you do not get rid of the Alternaria in a timely manner, then the green leaves will begin to dry.
When the stems are affected, brown oval-shaped spots are formed on them. Sometimes rot appears on them, due to which the leaves fall.
The disease affects the ovary of pepper, stalks, petioles and leaves. The main symptoms of cladosporiosis include:
- the appearance of pale green spots, which are covered with a fungal bloom on the outside;
- the rapid spread of the disease from the bottom of the bush to the top;
- wilting and drying of leaves after transplanting seedlings.
The spread of the disease is carried out through plant debris, contaminated tools and soil. A feature of cladosperiosis is that it is not transmitted through seeds.
Quite often, it is she who is the reason why the leaves of pepper seedlings turn white. The disease affects the leaves located near the root zone of the pepper. Also, over time, it appears on the fruits, which is why they become softer and watery. The causative agent of white rot can be found in soil or plant debris.
So that the leaves do not turn white, you need to constantly monitor the humidity of the air, remove withered leaves and stepsons.
Disease control agents
Having decided on the reason why the pepper leaves turn white, you can begin to solve this problem. Many vegetable growers do not know what to do when the leaves with veins on the pepper bushes brighten. You can get rid of this problem with the help of special drugs.
This biological preparation helps to get rid of such diseases as septoria, cladosporium, alternaria and late blight. It must be diluted with water before use. First, it is mixed with a small amount of liquid, after which it is poured into the total amount of water. If you need to water 10 square meters of the plot, 2 tablets of the drug are added to 10 liters of water. There are several ways to use Alirin-B:
- Before planting seedlings in open ground. The solution is applied to the soil with a watering can and mixed with it. To do this, you can use a regular shovel or cutter.
- Adding to the wells. 300 g of working solution is added to one well. To create it, you need to add one Alirin-B tablet to a liter of water.
- Use during the growing season. During this period, the bushes are fed several times a month with an interval of 4-6 days.
It is one of the most effective remedies against bacterial and fungal diseases. To prepare the liquid, you need to add 250 grams of quicklime and copper sulfate to 7-8 liters of water. Before use, the mixture is thoroughly mixed and filtered through cheesecloth folded in several layers.
A properly prepared solution should not contain much copper and have a light blue color. To check the acidity of the mixture, you should use an iron nail, which is dipped into the liquid for 3-5 minutes. If a red coating appears on it, then the mixture contains too much copper.
It has protective properties, with the help of which you can not only get rid of fungal diseases, but also prevent their occurrence.
It is recommended to use the drug after planting seedlings in the ground. At the same time, this should be done in the sutra or in the evening, when there are no strong gusts of wind outside. Quadris SC penetrates into the leaf plate and protects it from fungal diseases.
The drug is used in the form of an aqueous solution. For its preparation, 300 g of Quadris SC is added to 5 liters of water. Use the working mixture within 24 hours after preparation.
With the help of this biological remedy, you can get rid of many fungal diseases. The preparation contains the soil fungus Trichoderma.
Trichodermin is used after planting seedlings for watering pepper bushes in a greenhouse. To prepare a working solution, you need to mix a liter of water with 10 grams of the drug. During watering, the liquid must be poured under the root of each bush.
The prepared solution can be stored in the refrigerator for no more than one month.
There are several recommendations with which you can stop the development of fungal diseases on pepper.
Before planting seeds, they must be disinfected. This can be done using heat treatment. To do this, a few weeks before planting the seeds, they will have to be placed in a weak zinc solution for half an hour. In this case, the temperature of the liquid should be about 100 degrees. After that, the seeds can be cooled in cool water and dried.
You should also do and fertilize the soil. To do this, the soil must be fed 2-3 times with a warm manganese solution. For its preparation, 5-7 grams of the drug is mixed with 10 liters of water.
You can get rid of various fungal diseases of bell pepper on your own. To do this, it is enough to understand why the leaves of peppers can turn white and what drugs will help solve this problem.