Eggplant powdery mildew is common in the production of red eggplant in channel county. If it is not controlled in time, it will seriously affect eggplant production and reduce economic income. Powdery mildew mainly damages the leaves. At the beginning of the disease, irregular chlorotic yellow spots appear on the leaf surface, and small white mildew spots appear on the corresponding parts of the leaves. Afterwards, the number of lesions increases, and the white powder becomes increasingly obvious and appears white spot. The white-powdered spots can be connected to each other and spread throughout the entire leaf surface. When severe, the front and back sides of the leaves are completely covered with white powder, and finally the leaf tissue becomes yellow and dry. Powdery mildew belongs to a fungal disease. The pathogen mainly overwinters on the diseased body with a closed cyst shell. When the conditions are appropriate in the following year, the ascospores are radiated and spread, resulting in the expansion of asexual spores and the epidemic of the disease. In general, partial application of nitrogen fertilizer, shaded fields, poor ventilation and light transmission, and high humidity in the field are susceptible to serious disease. Powdery mildew begins to fall into the autumn and the temperature is 16-24 °C suitable for onset.
In terms of prevention and control, agricultural control is the main choice: selection of disease-resistant varieties, rotation, and close planting, avoiding excessive application of nitrogen fertilizers, application of phosphorus and potassium fertilizers, ventilation and dehumidification in the fields, timely removal of diseases, old leaves and diseased bodies, prevention and reduction Disease occurs. Before the onset of disease, 50% sulfur suspension 500 times or 75% chlorothalonil wettable powder 500-600 times or 70% mancozeb wettable powder 500-600 times spray can be used. At the beginning of the disease, 15% triadimefon (Triadimefon) EC 800 times or 25% Myclobutanil EC 2000x or 10% difenoconazole water dispersible granules 1500-2000 times or 400g can be used. Silicone emulsion 4000-5000 times or 250 grams of propiconazole emulsion 1000 times spray. 7-10 days spray 1, continuous spray 3-4 times.
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