Prevention and control of diseases and insect pests of watermelon in summer and autumn

Watermelons cultivated in summer and autumn are most vulnerable to various diseases and insect pests. In the early stage, in case of high temperature and drought, it is extremely easy to infect virus disease, plant stems and leaves grow malformed and lose fruit-setting ability; while in the case of high temperature and high humidity, it is easy to be infected with fungal diseases, such as powdery mildew, downy mildew, etc., which reduces the photosynthetic function of leaves; rainy and windy weather is easy to infect anthracnose and blight, but also prone to insect pests such as aphids, thrips, red spiders, leafminers and so on. The prevention and control of all kinds of diseases, insect pests and weeds should give priority to prevention. In addition to strengthening cultivation management, timely pruning and pruning and reasonable fertilization and watering, chemical control should be carried out in time once diseases, insect pests and weeds are found.