At present, it has entered the season where melon downy mildew is easy to occur. Prevention and treatment of downy mildew is particularly effective in ensuring high yield and quality of main melons, increasing yield and income. After entering the onset period of melon downy mildew, use protective pesticide bactericide to prevent before the onset of disease. The pesticide bactericides that can be used are chlorothalonil and mancozeb, and the bacteriostatic agent can be used in the protected area. Wait.
When the pathogenesis center of melon downy mildew appeared in the field, the diseased leaves were first removed, and then the 52.5% inhibitory water-dispersing agent 1500 times solution, or 72% kelu wettable powder, or 72.2% Lectra water 600-700 times solution, or chlorothalonil wettable powder 750 times solution sprayed once. The protected area should be sprayed on a sunny morning. After spraying, the shed will be warmed up. The water of the right leaf will evaporate quickly, and then the seam will be drained. If the condition is slow, use 80% of phosphorus, manganese and zinc every 7 days. Wet powder 500 times liquid, or chlorothalonil smoke agent prevention and control 2-3 times, if it is found that the use of ethyl phosphorus manganese zinc, chlorothalonil after the disease has developed, should be used to block the net, Kelu or Pulik and other pesticides Bactericide control. It is recommended to use a good drug with systemic treatment for the first time. When the disease is slow, switch to other domestically-made drugs. In addition to reducing the cost, it can also prevent the resistance of cucumber downy mildew to Kelu or Plex.
In addition, 50% dimethomorph WP can be used, which is produced by BASF in Germany. It mainly controls downy mildew, epidemic disease, and the dosage of 30-40 grams per mu is used once every 7-10 days for 2-3 times. 25% Amishida EC, also known as azoxystrobin, mainly to control downy mildew, epidemic disease, the amount of 30-40 grams per mu, once every 7-10 days, continuous medication 2-3 times. 70% enoyl gram WP, produced by American Dow AgroScience Co., Ltd., with an amount of 60-75 grams per mu, mainly for controlling downy mildew and epidemics, once every 7-10 days, and continuously for 2-3 times. 50% gray WP, mainly for controlling gray mold and sclerotinia, using a concentration of 1500 times, produced by American Dow AgroScience Co., Ltd., once every 7-10 days, continuously for 2-3 times. 60% Baitai·oxazolone·Dyson water dispersing agent, 40-60 grams per mu, produced by BASF, Germany, once every 7-10 days, continuous use 2-3 times.
25% Kairun EC, pyraclostrobin, mainly to prevent powdery mildew, downy mildew, 20-40 liters per mu, produced by BASF, Germany, once every 7-10 days, continuous use 2-3 times. 50% bacteriostatic high-efficiency smoke agent, 100-150 g/mu, once every 5-7 days, mainly to control gray mold, downy mildew, powdery mildew, early and late blight.
40% acetaminophen WP, prevention and control of powdery mildew, downy mildew, 25-50 grams per mu, once every 7-10 days, continuous medication 2-3 times.
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