How to prevent and cure watermelon downy mildew?

How to prevent and cure watermelon downy mildew? What harm does watermelon downy mildew have? Also ask experienced netizens to help introduce that like other melon crops, watermelon also has downy mildew. The farming network has sorted out the harm and control methods of watermelon downy mildew, which are listed below for netizens' reference. The harm of watermelon downy mildew: downy mildew mainly harms watermelon leaves and occasionally harms stems, tendrils, pedicels and so on. In the early stage of downy mildew, waterlogging light green spots appeared on the back of watermelon leaves, and gradually turned yellow. After enlargement, the lesion is polygonal due to the limitation of leaf veins, and finally turns brown, but the edge of the spot is still brown, and the junction between the disease part and the healthy part is not obvious. In a humid environment, a black mildew layer grows on the disease spot on the back of the leaf. In the high temperature and dry environment, the disease spot quickly withered and yellowed, expanded slowly, and the disease progressed slowly. Prevention and control methods of watermelon downy mildew: first, cultivation and management measures should be strengthened, such as cultivating strong seedlings, applying manure and potash fertilizer, strictly controlling watering, paying attention to field ventilation, promoting plant growth and so on. Control methods 2. After discovering watermelon downy mildew plants, the diseased leaves should be removed, buried or burned immediately, and spraying should be carried out at the same time to control the development of the disease. Control method 3, use 75% chlorothalonil 600x liquid, or use 25% Ruidu 1000 times liquid, can also use 80% mancozeb 500x solution to spray; the above agents should be used alternately, spray once every 7 days, even 3 times for 4 times. Spraying is mainly on the back of the spray leaf. Click to get more watermelon planting techniques click to get more fruit planting techniques