How to do the fall and winter cucumber cucumber back green lesions
The cold weather in the early winter of this year comes later, but the management of energy-saving solar greenhouses is not coordinated with the climate of this year. From late October to mid-November, cold protection equipment from north to south protected areas in northern China is covered at one time by the greenhouses. Crops such as cucumbers, gourds, and tomatoes are overgrown and their leaves are large and thin. In some areas, cucumbers are more common, especially in those areas where there is excessive rainfall in late autumn, low-lying areas, and shallow water levels. Take cucumber as an example. Leaf yellowing, malformed water immersed chlorotic spots, gradually enlarged into a nearly round or polygonal brown spots, diameter 1 ~ 2?, surrounded by faded green halos, the back of the diseased leaves in the early morning or cloudy days easily out of a small section of Ming Pulse, but sterile pus, different from bacterial angular spot. The disease is bacterial leaf blight, the symptoms of young leaves are not obvious, and the major damage is the functional leaves.
Control methods: Seed treatment, melon seeds can be soaked in warm water at 50 °C for 20 minutes, remove and germinate after drying, or immerse for 1.5 hours with 77% copper hydroxide 600 times, rinse and re-germination. Chemical control. Start spraying 25% wulkaning wettable powder 600 times at the beginning or spread of the disease, alternately with 50% potassium copper carboxylate (DT) wettable powder 500 times, or 60% dimethoate aluminum (DTM) Wettable powder 500 times or 77% can be used to kill WP 800 times. When the disease is light, 72% agricultural streptomycin WP 2000 times + 75% chlorothalonil 600 times can be used. ~ 3 times. Humic acid copper has certain preventive and therapeutic effects on powdery mildew and downy mildew.
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