1. Use resistant varieties. There is a significant difference in disease resistance among different melon varieties. Therefore, selection of disease-resistant varieties is the key to controlling the degree of disease occurrence. 2. Clean the pastoral. After the crops are harvested, weeds and residues should be promptly removed. Weeding should be carried out in the growing period of melon, and diseased leaves should be removed. Weeds, residues and diseased leaves should be brought to the field and burned. 3. Scientific management, enhance plant disease resistance. Apply base fertilizer, in particular to re-appropriate organic fertilizer, deep-turning fine stem; prevent plant growth and premature aging, timely arranging shoots, strengthen ventilation and light; pay attention to topdressing phosphorus, potash fertilizer, and use good foliar fertilizer, cultivate strong vines , to enhance the population resistance. 4. Scientific irrigation. Create environmental conditions that are suitable for the development of melons that are not conducive to the development of powdery mildew. Irrigation must master four principles: do not pour the water on a cloudy day, pour in the morning without pouring in the morning, do not pour on large water and pour on small water, and do not pour out clear water on dark water (that is, submerged under film). 5. Chemical control. Use 15% triadimefon 1000 to 1500 times liquid, 40% Dakening suspension 800 to 1000 times, or 40% Fuxing Emulsion 6000 times, or 10% Shihai Dispersible Granule 2000x, or 30% Tefolin wettable powder 5000 times, or 50% thiophanate-methyl wettable powder 1000 times alternately spray control, spray 7 to 10 days, and even spray 2 or 3 times. Medication is forbidden for 7 days prior to harvest for safe harvesting.