Powdery mildew is the main disease of the Dutch bean. Its main symptoms are: firstly, white powdery lesions appear on the leaves, and after the expansion, the lesions are connected with each other, resulting in the whole leaf being covered with a white powder on the back and back, and the white powder is grayed out in the latter stage. Ye Zheng is covered with white powder on both sides and the leaves are dry. After the stems and locusts were infected, white patches appeared, causing dead yellow. In the high humidity, large temperature difference between day and night, easy to disease, poor ventilation, lack of light, excessive watering, partial application of nitrogen fertilizer is easily aggravated. Control methods: 1. Based on local conditions, reasonable selection of disease-resistant varieties. 2. Seed dressing with 0.3% seed weight of 70% thiophanate-methyl wettable powder, and soaking for 48-72 hours after sowing, can delay the onset period of one month. 3. Strengthen the management of fertilizer and water, increase the application of phosphorus and potassium fertilizers, and plant them in close-packed areas to keep the fields airy and transparent. 4. Chemical control: At the beginning of the disease, spray 15% Trispermine WP 1500 times, or 10% Shishui Aqueous 1000 times, spray once every 7 days or so, spray 3-4 times continuously. According to the condition of the seedlings, if the condition is still heavy, then continue spraying for 3-4 times.
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