Variable temperature management: In the morning, when the grasshoppers are opened, the air is discharged for half an hour, and then the greenhouse is closed. The temperature of the greenhouse is quickly mentioned to be above 28°C. 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. Timely watering: timely watering according to the weather, soil moisture and seedlings. Watering time should be selected in the sunny morning, can be poured 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. Improve the cultivation conditions: greenhouses should use non-drip membranes as much as possible. 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 light curtain on the back wall of the shed to enhance the light in the shed and increase the temperature inside the shed. In addition, hay can be spread between rows to prevent evaporation of soil moisture and reduce the humidity in the shed. High temperature stuffy sheds: After entering April, if a diseased plant is found, it may be closed on sunny days in the morning. The temperature will be raised to 45°C and maintained for 2 hours to kill the bacteria in the shed. In order to prevent the occurrence of downy mildew, a boring shed may be used once a week, and after the sheds are properly released, the amount of bleed air is small and large. It should be noted that the day before the dungeon must be watered. Nutritional control: After the cucumbers enter the middle and late growth stages, the growth of the cucumbers is obviously weakened, and the nitrogen sugar content in the juices of the plants is reduced. In this case, the plants are most susceptible to downy mildew. At this time, nitrogen can be sprayed on the leaves 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. Cultivate strong seedlings: It is best to use wild pumpkin grafting seedlings. The roots of cucumber grafted with this pumpkin seedling are well developed and highly resistant to downy mildew. In addition to selecting the above measures to prevent downy mildew, every morning should also be carefully examined in the field, immediately after the diseased leaves are found and removed, and preventive measures are taken to eliminate the disease in the bud.
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