How to apply fungicides for effective control of powdery mildew on melons
1. Choose disease-resistant varieties. Disease resistance varies noticeably among different melon varieties, so choosing disease-resistant varieties is key to controlling the severity of the disease. 2. Clean up the field. After harvest, weeds and crop residues should be removed promptly; during the melon growing season, weed promptly, remove diseased leaves, and take weeds, residues, and diseased leaves...
1. Choose disease-resistant varieties. Disease resistance varies noticeably among different melon varieties, so choosing disease-resistant varieties is key to controlling the severity of the disease.
2. Clean up the field. After harvest, weeds and crop residues should be removed promptly; during the melon growing season, weed promptly, remove diseased leaves, and take weeds, residues, and diseased leaves outside the field to be burned in a centralized pile.
3. Scientific management to enhance plant disease resistance. Apply sufficient base fertilizer, especially heavy applications of decomposed organic fertilizer, and plow deeply and harrow finely; prevent excessive vegetative growth and premature aging of plants, train branches and vines promptly, and improve ventilation and light penetration; during the mid-growth stage, pay attention to topdressing with phosphorus and potassium fertilizers, and make good use of foliar fertilizers to cultivate strong branches and vines and enhance the disease resistance of the population
4. Scientific irrigation. Create environmental conditions suitable for melon growth but unfavorable for the occurrence and development of powdery mildew. Master 4 principles for irrigation: do not water on cloudy days but water on sunny days, do not water in the afternoon but water in the morning, do not apply heavy irrigation but apply light irrigation, and do not apply surface irrigation but apply subsurface irrigation (that is, subsurface irrigation under plastic film).
5. Chemical control. Choose 15% triadimefon wettable powder at 1000-1500 times dilution, or 40% Daconil suspension concentrate at 800-1000 times dilution, or 40% Fuxing emulsifiable concentrate at 6000 times dilution, or 10% Shigao water-dispersible granules at 2000 times dilution, or 30% Tefuling wettable powder at 5000 times dilution, or 50% thiophanate-methyl wettable powder at 1000 times dilution, etc., and apply them by spraying in rotation and alternation, spraying once every 7-10 days for 2-3 consecutive sprays. Do not use chemicals 7 days before melon harvest to allow safe harvesting.