Eggplant powdery mildew mainly damages the leaves. At the early stage of disease, the leaves on the front and back of the eggplant produce white, nearly round, small spots. White patches gradually enlarge the continuum, and the later leaves are covered with white powder and turn grayish white. When the disease is severe, the entire leaves die. The pathogenic bacteria live on greenhouse vegetables or in the soil for winter, and spread by wind and rain. It is prone to occur under conditions of high temperature, high humidity or arid environment. The optimal temperature is 20-25°C, relative humidity is 25%-85%, but under high humidity conditions. Severe onset. Control methods: 1. Disinfection of seeds and facilities. Seed soaking in warm water at 50°C for 30 minutes, or dressing with 15% triadimefon wettable powder. Prior to planting, each 50 cubic meters of room space with sulfur powder 120 grams of mixed wood chips 500 grams, loaded into the brazier, closed the canopy in the evening, dark fire lit, fumigation 1 night. 2. Agricultural measures. Reasonably dense planting to avoid excessive application of nitrogen fertilizer, increase phosphorus and potassium fertilizer. Prevent leggy. Pay attention to ventilation and light, reduce air humidity. 3. Chemical control. At the beginning of the disease, 15% triadimefon WP can be sprayed 1500 times, or 75% chlorothalonil WP can be 600 times, or 2% NR 120 can be 200 times, or 2% Wuyimycin can be used 200 times. Diluent, or 20% antimycotic 200 times, or 40% polysulfide suspension 500 times, or 30% cypermethrin WP 2000 times, or 40% ash WP 1500 times, or 12.5% ​​speed Baoli WP 2000 times, or 40% zirconia copper wettable powder 2500 times liquid and other agents. Every 5 to 7 days, spray 2 or 3 times. Ordinary Medical Masks;Disposable Medical Face Masks; Hospital Masks Taizhou Volsen Chemical Co., Ltd. , https://www.volsenchem.com