Melon powdery mildew prevention and treatment method
   Melon powdery mildew is a common disease, especially when the plant grows weakly in the middle and late stages. In addition to harming melon, melon powdery mildew also harms cucumber, zucchini, pumpkin, bitter gourd, watermelon and some flowers.
   Symptoms mainly damage leaves, but also infestation of petioles, melons and melons. At the beginning of the onset of the leaves, near-circular white mildew spots (ie, pathogenic mycelium and conidia) are formed on the leaf surface, and then expanded into mildew spots. The conditions are suitable, the mildew spots are rapidly expanded, and the pieces are contiguous with each other. When the whole leaf is full, the leaves become brittle, and the mildew on the lesions becomes grayish white, and the black small particles are formed on the lesions, that is, the closed capsule of the bacteria. When the disease is serious, the leaves appear irregular yellow-brown lesions, and the lesions are contiguous and the whole leaves are brown and dry, but do not fall off. The petiole, melon vine and melon are also infected with white powder spots. After development, the diseased part is covered with white powder.
   Control method
   1. Strengthen melon resistance. Selection of resistant varieties Different varieties have different resistance to powdery mildew, and it is necessary to choose disease-resistant and disease-resistant varieties according to local conditions in production practice.
   2. Maintain environmental sanitation. The diseased leaves were removed in time and the diseased leaves were brought to the outside of the shed and burned.
   3. Scientific watering. In the morning on a sunny day, the small water should be poured, and the flooding should be avoided. Drip irrigation should be taken in places where conditions permit.
4, cultivation control: melon generally requires a high-quality ring fertilizer 6000 ~ 7500 kg per mu, 500 ~ 1000 kg of decomposed chicken manure, 50 kg of superphosphate and grass ash as base fertilizer, and timely topdressing, foliar fertilizer and carbon dioxide fertilization, Increase the light as much as possible to prevent premature senescence of the plant, so as to improve the disease resistance of the plant; the cultivation method should be covered with sorghum cultivation and plastic film to protect the root system, and strengthen the ventilation and light transmission to reduce the humidity; the hanging and timely removal of the yellow and yellow leaves and the bottom leaves , bring out the field for centralized treatment; proper control of watering, open sweet potatoes should do a good job after rain, reduce the relative humidity in the field.
5. Biological control In the early stage of powdery mildew, spray 2% agricultural anti-120 water agent 200 times liquid or 2% agricultural anti-BO-10 water agent 200 times liquid, spray once every 4 to 5 days, even spray 2 to 3 times.
   6. Physical control At the beginning of the disease, spray 27% high-fat film emulsion 80-100 times solution, spray once every 5 to 6 days, and spray 3 to 4 times to form a protective film on the leaf surface to prevent the invasion of pathogenic bacteria.
   7. In the early stage of drug prevention and treatment, 40% Fuxing emulsifiable concentrate 8000～10000 times liquid, 15% triazolone (powder rusting) WP 2000 times liquid, 75% chlorothalonil WP 600 times liquid, 75% Dakko Ning wet powder 600 times liquid, 50% carbendazim wettable powder 500 ~ 800 times liquid, 50% methyl thiophanate WP 800 ~ 1000 times liquid, 80% loud WP 600 times liquid spray control, 7 Spray once every 10 days (the spray of triazolone should be sprayed a second time after 15 days) and spray 2 or 3 times. It is forbidden to use the drug 7 days before harvest for safe harvesting.
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