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During the vegetative growth stage, hyphae of capsicum powdery mildew are hidden in the leaf, waiting for the propagule to be produced. Only reach out the foliage. Once the lesion is found, it is difficult to control it again. Therefore, it is necessary to prevent and treat the disease early. It is best to use a protective fungicide every few days when the disease is about to occur. After the diseased leaves appear in the field, systemic drugs must be used and used multiple times. After the medicine, the yellow leaves below are not seen, but the new leaves are kept.
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 80% large raw wettable powder 500 times night. The systemic fungicides are: 50% carbendazim Nanling wettable powder 500 times solution, 70% methyl thiophanate WP 1000 times solution, 15% powder rust (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% polysulfur suspension agent 400-500 times liquid. Mixing 10% Shigao Water Dispersible Granules (3000 times liquid) with 75% chlorothalonil wettable powder (500 times liquid) has a good effect.
When using systemic fungicides, pay attention to the resistance of the bacteria. If carbendazim and methyl thiophanate are not effective, they can be replaced with rust- ning or Fuxing. If you use rust-free and good fortune, you can use Shigao or Nitrile. Pyrazole.
Capsicum powdery mildew is mainly a dense white plaque on the back of the leaf, which is then enlarged throughout the leaf back. When the condition is serious, the diseased leaves fall off, and when the temperature is relatively low, continuous rain occurs.
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