Prevention measures include: 1. Strengthen plant adjustments. When cucumbers fall, they cannot fall too low once, and the plants are maintained at a height of about 1.5 meters, ensuring that there are more than 15 functional leaves on the plants. For more plants sitting melon, to be properly melon, invisible melon stay, otherwise it is easy to cause the middle and late "rest." The yellow leaves at the bottom should be removed in time to reduce nutrient consumption. 2. Strengthen light management even in cloudy days. Even after the sunny days can not suddenly suddenly uncover the grasshopper, should explode flower buds, so as not to cause flash seedlings. 3. Pay attention to fertilizer management. Watering in low-temperature and low-light weather cannot be too diligent and flood irrigation is not possible. Also note that after the watering, wait until the temperature in the shed increases to 30°C to release the air, and the air outlet should be small to large. Do not overdo it at one time to avoid flashing. Fertilizers are flushed with water, and fertilizers containing humic acid or amino acids that are easily absorbed by cucumbers should be applied. The amount of one-time use should not be excessive. 4. Strengthen disease prevention and control. Cucumbers in greenhouses are susceptible to downy mildew, brown spot disease, gray mold, and bacterial keratoderma. For these diseases, we must adhere to the idea of ​​“prevention as the mainstay and comprehensive prevention and control†to ensure that there are no susceptible plants in the shed. When using drugs, the concentration should be strictly controlled. Do not mix three or five kinds of pesticides to reduce the occurrence of phytotoxicity.
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