Control measures of Pepper powdery mildew

Pepper powdery mildew is a fungal disease caused by powdery mildew. This disease has become one of the serious diseases of pepper, seriously endangering the yield and quality of pepper. The following editor for everyone with powdery mildew symptoms, incidence rules and prevention and treatment methods, let's take a look.

1. Symptoms

Powdery mildew mainly harms pepper leaves, as well as tender stems and fruits. Chlorotic spots with different numbers and irregular shapes will appear on the leaves, sparse mildew layers will appear on the back of leaves, and chlorotic spots begin to spread continuously, resulting in chlorosis in a large area of leaves. The disease will hinder the photosynthesis of leaves, affect the normal growth of plants, and in serious cases, wither and necrosis of leaves.

2. The regularity of the disease

Powdery mildew is an internal parasite. When the disease occurs in the field, the hyphae will continue to spread in the mesophyll tissue, and the conidia will protrude from the stomata on the back of the leaves and spread under dry conditions. Mainly through the spores spread with the air flow, constantly invade the new leaves, and then produce new spores in the disease, and then fall off after the spores mature to spread by the wind, so back and forth, will lead to disease in the whole field in a short time. Powdery mildew is mainly parasitized by internal hyphae in the early stage, and it is generally found that the disease spot in the leaves is already in the later stage of the disease, which will bring some difficulties to the prevention and control.

3. Agricultural prevention and control

Strengthen fertilizer and water management in the field and apply rotten organic fertilizer or farm manure as base fertilizer before planting, which can prevent germs and insect eggs from being brought into the field. In the plant growth period, increase the application of phosphorus and potassium fertilizer, little or no application of available nitrogen fertilizer, reasonable close planting, proper watering, frequent ventilation, pay attention to the soil moisture content, avoid sudden dry and wet. When watering, try to choose in the sunny morning, drip irrigation is appropriate, keep in mind that flood irrigation or out-of-film irrigation, watering generally every 10-20 days, different seasons watering interval is different.

4. Chemical control

In the early stage of the disease, there are only a few chlorosis spots in the leaves, and at this time the pathogenic hyphae are still in the germination stage in the leaf tissue, and then triadimefon, Ningnanmycin, Wuyisin and other agents are sprayed in time, once every 7-10 days, 2-3 times in succession, can effectively control the disease. In the middle stage of the disease, white disease spots appear in the leaves, tender stems and fruits of the plant. At this time, the pathogen room has been developed in the external environment and will begin to spread in a suitable environment. At this time, the prevention and control agents should be increased by 15% and 20%. And spraying must be comprehensive. Prevention and control agents can be used flusilazole EC, ether carbendazim water dispersible granules, pyrazolyl carbendazim EC and so on.

The above is the introduction of pepper powdery mildew prevention and control measures, hope to help you, want to know more related knowledge, please pay attention to us.