What to do about pepper leaf spot disease, what is the cause of pepper leaf rot disease?

The control measures for bacterial leaf spot disease of pepper are: Agricultural measures. Avoid continuous cropping, use high furrow cultivation, and cover with plastic film.

Pay attention to drainage during the rainy season and avoid flooding. After harvesting, remove the diseased remains or turn them deeply. Seed sterilization.

Before sowing, mix seeds with 50% copper succinate wettable powder or 50% dixone wettable powder or other fungicide by seed weight. Pharmaceutical prevention and control. At the beginning of the disease, spray 500 times of 50% copper succinate wettable powder, or 300 times of 14% copper ammonia aqueous solution, or 400 500 times of 77% copper hydroxide wettable powder, or 4000 times of 72% agricultural streptomycin, spray once every 7 10 days, and continuously control 2 3 times.

Spraying of leaf spot disease from the early stage of disease prevention prevents the spread of the disease. Commonly used agents are 20% silazole prochloraz 1000 times, 38% oxafrost copper strobin 800-1000 times or 4% flusilazole 1000 times, 50% tobuzin 1000 times, 70% mancozeb 500 times, % mancozeb 400-600 times, 50% clotodan 500 times, etc. It is necessary to pay attention to the alternate use of pesticides to avoid the development of antimicrobial resistance by germs.

It is mainly harmful to leaves. Leaf spots appear on both sides of the front and back of the leaf, nearly round to oblong or irregularly shaped, the size is 2 12 mm, the leaf lesions are light brown to yellowish-brown, when the humidity is high, the corresponding parts of the back of the leaf have dense gray-black to nearly black velvet, and the lesions are surrounded by dark brown fine coils on both sides of the front and back, and some also have light yellow halos on the periphery.

Pepper leaf rot may be pepper wilt, when pepper wilt occurs, the leaves gradually turn yellow from the bottom up and fall off in large quantities. The cortex at the base of the stem in contact with the ground decayed in a water-soaked manner, and the stems and leaves of the aboveground withered rapidly. Sometimes the disease develops only on one side of the stem, forming a strip-like necrotic zone, and the whole plant dies later.

The underground root system is water-soaked and soft rot, the cortex is easily peeled off, and the vascular bundles can be seen to turn brown when cut longitudinally from the base of the stem. Under conditions of high humidity, white or blue-green mold is often produced in the diseased area. How can it be prevented?

Pepper leaf rot disease control measures.

2. Soil treatment, when cultivating in protected land, solar energy can be used to disinfect high-temperature soil in the summer high temperature season, first, ridge, fill with water and then fully spread the mulch film, close the shed, so that the soil temperature rises, and the temperature at 20 cm below the surface is kept above 45 for 20 days. This method also kills other germs and pests in the soil.

2.Pay attention to the weather when spraying, avoid high temperatures and rainy seasons, and try to choose the morning or evening.

Summary. Hello dear pepper seedlings have leaf spot disease, which can be treated by following the steps below:1

Remove the diseased leaves by hand: This is the first step in preventing the spread of the disease, cut off the leaves that have leaf spots, and remember not to touch healthy plants when handling. 2.

Spraying pesticides: Copper-containing fungicides (such as copper sulfate) can be used to control leaf spot, and attention should be paid to spraying all the fungicides, including the back of the leaves. 3.

Adjust the planting environment: Leaf spot likes moisture, so adjust the amount of watering to avoid over-wetting. At the same time, make sure there is enough space between the plants to allow air circulation and reduce humidity.

4.Planting disease-resistant varieties: The next planting, choosing disease-resistant varieties can reduce the occurrence of leaf spot to a certain extent.

After finishing it, it will be sent out together.

The leaves have black and white spots.

Hello dear pepper seedlings have leaf spot disease, which can be treated by following the steps below:1Manually remove the diseased leaf first:

This is the first step in preventing the spread of the disease, by cutting off the leaves that have leaf spots, and remembering not to touch healthy plants when handling. 2.Spraying pesticides:

Copper-containing fungicides (such as copper sulfate) can be used to prevent and control leaf spot, and attention should be paid to spraying fully when using fungicides. 3.Adjust the planting environment:

Leaf spot likes moisture, so adjust the amount of watering to avoid getting too wet. At the same time, make sure there is enough space between the plants to allow air circulation and reduce humidity. 4.

Planting disease-resistant varieties of jujube: the next planting, choosing disease-resistant varieties can reduce the occurrence of leaf spot to a certain extent.

Summary. 1. After spraying pepper infected with spotted defoliation, the initial stage of the disease is the best period for the drug, at this time, you can spray Bordeaux liquid for the plant to prevent and control, or spray the diseased area with 50% carbendazim wettable powder, and use the drug again after 7-10 days. 2 42. After spraying pesticides for pepper in time, in order to prevent the spread of pathogens in the later stage, it is necessary to adjust the changes in temperature and humidity in the field, and reasonably do a good job in field drainage and irrigation measures.

3 43, reasonable fertilization pepper in the case of nutrient imbalance is also susceptible to infection, in order to improve the disease resistance of the plant, it is necessary to apply compound fertilizer scientifically during planting, so that the nutrition is balanced and comprehensive, to ensure the vigorous growth of pepper.

1. After spraying pepper infected with spotted defoliation, the initial stage of the disease is the best period for the drug, at this time, you can spray Bordeaux liquid for the plant to prevent and control, or spray the diseased area with 50% carbendazim wettable powder, and use the drug again after 7-10 days. 2 42. After spraying pesticides for pepper in time, in order to prevent the spread of pathogens in the later stage, it is necessary to adjust the changes in temperature and humidity in the field, and reasonably do a good job in field drainage and irrigation measures. 3 43, reasonable fertilization pepper in the case of nutrient imbalance is also susceptible to infection, in order to improve the disease resistance of the plant, it is necessary to apply compound fertilizer scientifically during planting, so that the nutrition is balanced and comprehensive, to ensure the vigorous growth of pepper.

4. After the insect pest control pepper is infected with insect pests, the pests will become the transmission route of spotted defoliation, at this time, it is necessary to cut off the insect branches on the plant and burn them, and then spray trichlorfon solution for the pepper, and strengthen ventilation after spraying to prevent large-scale necrosis of the plant.

<> if there are yellow spots on the leaves of peppers, it may be caused by insufficient fertilizers, lack of light, and pests and diseases. If the fertilizer is insufficient, it is necessary to apply fertilizer in time to provide enough nutrients for it to recover. It is also necessary to pay attention to maintaining reasonable light, as long-term lack of light can also easily lead to the problem of yellow spots on leaves.

If it is caused by pests and diseases, it should be controlled with orange pesticides in time.

When the leaves of the pepper have yellow spots, it is necessary to fertilize them regularly. First of all, in the growth period of pepper trees, phosphorus and potassium fertilizer or organic fertilizer can be applied regularly, and excessive nitrogen fertilizer should not be applied, so as to avoid the occurrence of yellow spots on branches and leaves, and achieve the purpose of leaf growth and green.

When yellow spots appear on the leaves of peppers, adequate light conditions are required. For example, in the process of breeding, 6-7 hours of sunlight are carried out every day, which is conducive to photosynthesis and promotes the growth of branches and leaves. When the light is strong, it is necessary to take shading measures.

When the yellow spot appears on the leaves of pepper, it is a bacterial leaf spot disease, so it must be sprayed with pesticides in time**, which can be sprayed with 400-600 times of 45% ammonium dyssenium water or 2000-4000 times of 2% agricultural streptomycin sulfate soluble powder.