(1) Establish disease-free Taneda and select disease-resistant varieties suitable for local cultivation. At present, the varieties with good resistance are Zhengzhou No.5, Zhengza No.7, Xinong No.8, Yueyou No.2, Fuzhou Watermelon, Xinhongbao and so on. (2) After harvesting, pay attention to clear the sick and disabled bodies, bury or burn them in a centralized way, and do not pile the sick and disabled bodies on the edge of the field. (3) Adopting formula fertilization technology, applying compost fermented by enzyme bacteria, avoiding excessive application of nitrogen fertilizer, spraying Huimanfeng liquid fertilizer before sitting melons, and watering 500 times every 667m2320 meters to improve disease resistance. (4) Scientifically determine the sowing date. The average temperature on that day is stable above 15℃, and the soil temperature at a depth of 5 cm is stable above 12℃, that is, peaches begin to blossom, and watermelon should be planted in the open field. If you want to grab early, you can cover it with plastic film to make it reach the above temperature before sowing. (5) Soak the seeds with 75% chlorothalonil wettable powder or 50% chlorpheniramine wettable powder in 1000 times solution for 2 hours, and then accelerate germination and sowing after washing. (6) Rain-proof cultivation methods should be advocated when conditions permit, and special attention should be paid to ditching and drainage of open-field watermelons after rain to prevent water retention, which plays an important role in alleviating diseases. (7) Strengthen the forecast, and know that 50% Sukeling WP 1500 times or 50% chlorpheniramine WP 1000 times, 75% chlorothalonil WP 600 times, 70% mancozeb WP or dry suspension 500 times and 80% Sheng Da WP 6000 times before the onset of the disease. (8) Using scaffolding cultivation method, pruning one vine every 667m2 1500 plants, picking the first female flower when the leaves are 6 ~ 7, and leaving 12 ~ 13 leaves, which can not only increase production and income, but also alleviate diseases.