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How to identify and prevent cucumber downy mildew in greenhouse
Symptoms: The onset of the seedling stage, the appearance of chlorosis on the front, followed by yellowing, and eventually produce irregular yellow spots, in the wet environment, the back of the leaves produce a layer of purple and black mold. Plant disease, usually occurs in the lower leaves, the initial appearance of water-like yellowish spots on the leaves, after the lesion gradually expanded to 5 ~ 16 mm, limited by the veins were polygonal, yellow-brown, late dry spots Easily broken. In the case of high humidity, a layer of black mold is formed on the back of the leaves, and the diseased plants spread from the bottom up. Control methods: The pathogen of the disease is Cuba pseudomonas. The germination and invasiveness of the bacteria must have water droplets on the leaves. Therefore, the key to prevention and control of the disease is to reduce the air humidity in the greenhouse. When the central diseased plant emerges, it must be sprayed promptly. Initially spray 25% metalaxyl MnZn WP 400-600 times, or 645 antivirus WP 400 times, 75% chlorothalonil WP 600 times, spray every 5-7 days, total Spray 2 times. Can be used when severe 64% Antimony WP 400 times liquid + 40% EB aluminum wettable powder 200 times, or 64% antimony wettable powder 400 times liquid + 70% mancozeb wettable powder 500 times liquid , 75% DuPont Ke Lu wettable powder 800 times liquid and so on. When spraying, pay attention to the diseased leaves and healthy new ones. Spray at the same time on both the positive and negative sides. The spray should be uniform and meticulous.
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