Watermelon anthracnose occurs in the whole growth period of watermelon, but it is more serious in the middle and late stages. Cultivation in acidic soil, low terrain, poor drainage, excessive density, poor ventilation, excessive nitrogen fertilizer, etc. can cause and aggravate the disease. Therefore, prevention and control of watermelon anthracnose should focus on the selection of disease-resistant varieties on the basis of comprehensive prevention and control. On the basis of comprehensive prevention and control, we should focus on the selection of disease-resistant varieties, cool down and dehumidify, and protect the whole growth period. .
1. Choose high-quality disease-resistant varieties. Reasonable rotation to avoid continuous cropping. Strictly disinfect the seeds and nursery soil, and cultivate disease-free and robust seedlings.
2. Strengthen field cultivation management. Reasonable close planting, using soil testing and formula fertilization technology, adding organic fertilizer, phosphorus and potassium fertilizer. Improve the ventilation and light transmission conditions in the field, promote the robust growth of plants, and improve the disease resistance of plants. If the diseased leaves are found in the field, the diseased fruit should be removed in time and taken out of the field for deep destruction.
3. Chemical control. In the early stage of the disease, 50% of the WP 1500~2500 times of the WP can be used, 80% of the anthrax WP WP 800 times, 70% of the thiophanate-methyl WP 800 times or 10% of the high moisture dispersion granules 800~ 1000 times liquid is sprayed evenly. Spray once every 7 to 10 days and spray continuously for 2 to 3 times.
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