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Greenhouse cucumber downy mildew can be cured without drugs
1, variable temperature management: In the morning after pulling grasshoppers, put out the air for half an hour, and then closed the greenhouse, the temperature of the greenhouse quickly increased to 28 °C or more. When the temperature rises to 30°C, a small breeze is started. In the morning, the temperature is controlled at 28°C to 32°C. If the temperature of the shelf continues to increase in the afternoon, the amount of air leakage can be increased to lower the temperature to 20°C to 25°C. After the night, the temperature was controlled between 18°C ​​and 20°C in the middle of the night and the temperature was kept below 14°C in the late night. 2, timely watering: timely watering according to the weather, soil moisture and seedlings. Watering time should be selected in the sunny morning, can be pouring water, avoid flooding irrigation. Immediately after the watering, close the greenhouse, raise the temperature to 32°C, maintain at this temperature for 1 hour, and then release the air. 3, to improve the cultivation conditions: greenhouses should try to use non-drip membrane. The drop-free film has good light transmission, which can prevent the condensation of the film on the shelf, increase the temperature in the shelf, and reduce the humidity in the shelf. It is also possible to hang a reflective film on the back wall of the booth to enhance the lighting in the booth and increase the temperature inside the booth. In addition, hay can be spread between rows to avoid evaporation of soil moisture and reduce the humidity in the shed. 4. Nutritional control: After the cucumbers have entered the middle and late growth stages, the growth of the cucumbers is obviously weakened, and the nitrogen sugar content in the sap of the plants is reduced. In this case, the plants are most susceptible to downy mildew. At this point can be sprayed with nitrogen sugar liquid to supplement nutrition. The nitrogen sugar solution can be prepared with white sugar, urea, and water in a ratio of 1:0.5:100, sprayed once every 5 days, and sprayed 5 times. 5, nurturing strong seedlings: the best use of wild pumpkin grafting seedlings. The roots of cucumber grafted with this pumpkin seedling are well developed and highly resistant to downy mildew. In addition, every morning should also be carefully examined in the field, immediately after the diseased leaves were found and taken preventive measures to eliminate the disease in the bud.