First, it's important to carefully manage the temperature and humidity levels in the greenhouse to prevent downy mildew. The ideal conditions are around 18°C with humidity above 83%. In the morning, keep the temperature at about 28°C and humidity below 75% to reduce moisture buildup. During the afternoon, lower the temperature to approximately 23°C and maintain humidity around 70%. At night, especially during the middle of the night, allow the humidity to drop below 80% and ensure the temperature remains above 13°C. This helps create an environment that is less favorable for disease development.
Second, consider using a high-temperature greenhouse technique. On sunny midday hours, close the greenhouse completely to trap heat, allowing the internal temperature to rise above 43°C. Keep it sealed for about two hours before ventilating. Repeat this process once a week to effectively kill pathogens and reduce the risk of disease.
Third, water efficiently and at the right time. Watering should be done early in the morning on sunny days, avoiding rainy weather to prevent excess moisture. Monitor the soil condition and the health of the seedlings to determine the appropriate amount and frequency of watering. This ensures the plants receive adequate moisture without creating overly wet conditions that can promote disease.
Fourth, apply fertilizers strategically. During the fruiting stage, use carbon dioxide gas fertilizer to enhance plant growth and resilience. In the later stages, spray a solution of 0.1% urea and 0.3% potassium dihydrogen phosphate. These nutrients help improve the cucumber plants' ability to resist diseases and maintain overall health.
By following these four key practices—temperature and humidity control, high-temperature treatment, timely irrigation, and proper fertilization—you can significantly reduce the occurrence of downy mildew and promote healthier, more productive cucumber crops.
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