How to prevent pepper powdery mildew

Capsicum powdery mildew is mainly harmful to leaves, old mature or young leaves can be harmed, yellow-green irregular plaques on the front, no clear edges, white powdery mildew is not obvious, back dense white powder (pathogen spores and meristems) Spore), shedding earlier. It is more difficult to control, which is mainly determined by the characteristics of the bacteria. It belongs to the white powder fungus, and the hyphae are hidden in the leaves during the vegetative growth stage. When the propagule is produced, the leaves are extended. Therefore, it is often difficult to find it at an early stage, and once it is discovered, it is difficult to control it again. Therefore, prevention and control of chalky mildew must be early. It is best to use the medicine once every few days when it is going to be ill every year, and wait until it is outcropping, then press it back. Some people are worried that this is a waste of medicine, but it is not, because it is often impossible to control how many times a good medicine is used. Moreover, most of the fungicides used for prevention are relatively inexpensive protective agents, and it is not easy to control them when they are used because they are expensive. Therefore, it is better to prevent early. If a diseased leaf appears in the field, it is necessary to use a systemic drug for prevention and treatment, and it must be used several times. Even so, after a period of control, you will feel that the yellow leaves below are not seen, but the new leaves are kept. In this case, don't be discouraged, this is "effective." Unless all the old leaves and diseased branches are removed in time, the diseased leaf pathogens are sometimes retained until they are pulled.
At present, there are many drugs that can be used to prevent powdery mildew. The protective agents that can be used are: 50% sulfur suspension 500 times solution, 75% chlorothalonil wettable powder 500 times solution, 70% mancozeb wettable powder 400 times solution. The systemic fungicides are: 50% carbendazim wettable powder 500 times solution, 70% methyl thiophanate WP 1000 times solution, 15% powder rusting (triazolone) emulsifiable concentrate 1000 times solution, 40% Fuxing emulsifiable concentrate 8000~ 10000 times liquid, 10% Shigao water dispersible granules 2000-3000 times liquid, 25% nitrile emulsifiable concentrate 500-600 times liquid. The compounding agent is: 40% polysulfurate suspension 400-500 times liquid. Agricultural antibiotics are: 2% Wuyincin 150 times liquid. In addition, there are some special fungicides for protection: 45% chlorothalonil 250g/mu, 5% chlorothalonil dust 1kg/mu.
In the face of so many fungicides, which one is better? Protective fungicides and smoke agents can be used before onset; endocytic fungicides should be used after onset, and the resistance of pathogens should be noted when using systemic agents. In places where carbendazim and methyl thiophanate are not effective, you can use Shigao Ning or Fuxing, where the rust and the effect of Fuxing are not good. Wuyin can be used in the vicinity of the harvest.
In recent years, in the prevention and control of capsicum powdery mildew, a mixture of 10% Shigao water dispersible granules 3000 times liquid and 75% chlorothalonil WP 500 times liquid has been used, and good results have been obtained. You can try it.

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