Powdery mildew: Powdery mildew is mainly harmful to the leaves. In the early stage of the disease, white round small pink spots are produced on the back of the leaves, which continuously spread to the periphery. In severe cases, the leaves are covered with white powder, and the mildew of the later white powder turns grayish white, sometimes on the lesions. Produce small black spots. Control method: 15% powder rust WP 1500-1500 times liquid, or 50% sulphur suspension 250-300 times liquid, etc., sprayed once every 7 days, alternating use.
Gray mold: mainly damages flowers and young melons. Most of the pathogens invade from the flowers, causing the flowers and fruits to rot and grow gray mold layers. The disease is severely ill at lower temperatures and higher humidity conditions. Control methods: strengthen management, sorghum covering mulch film, proper water control, frequent ventilation and dehumidification, timely removal of diseased flowers, diseased leaves, etc.; 50% speed Keling WP 1000 times solution, or 50% sea It is used alternately with 1500 times liquid and 50% carbendazim WP 500 times, sprayed once every 6-7 days, and continuously sprayed 3-4 times.
Downy mildew: Onset at the seedling stage, the macula is damaged by the cotyledon, and finally dead; the leaves are water-stained at the beginning of the damage, and the development is a polygonal yellow lesion. It is easy to rupture when dry, and the long-back helmet is colored under the high temperature conditions. Mild layer. Control method: 58% solution of 58% toxic manganese zinc 500, 25% syphilis and 70% mancozeb 1:2 mixed, or 64% antivirus 矾 400 times, 6-7 days spray 1 time, alternately spray 3-4 times.
Leaf reduction disease: a physiological disease. In the growth of plants, many leaves show chicken flapping, the fruit setting rate is very low, and even without fruit, it is easy to be mistaken for viral disease. The main cause of the disease is the temperature difference between day and night and the humidity of the air. The water at the growth point is inhibited and the leaves are not normal. In the production, it is necessary to control the temperature change to prevent the occurrence of large temperature difference and to control the humidity.
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