First, it's essential to carefully manage temperature and humidity levels to prevent the occurrence of downy mildew. The ideal conditions are around 18°C with humidity above 83%. In the morning, keep the shed temperature at about 28°C and maintain humidity below 75%. During the afternoon, lower the temperature to approximately 23°C and reduce humidity to around 70%. At night, especially in the middle of the night, use the naturally low humidity to bring the shed’s humidity below 80%, and take advantage of the cooler temperatures to ensure the temperature stays above 13°C. This helps suppress the development of the disease.
Second, consider using a high-temperature greenhouse technique. On sunny afternoons, seal the greenhouse to allow the internal temperature to rise quickly beyond 43°C. Keep it sealed for two hours, then ventilate by opening the windows or doors. Repeat this process once a week to effectively control fungal growth and improve overall plant health.
Third, water efficiently and at the right time. Water early in the morning on sunny days to allow the soil to dry out during the day, which reduces the risk of moisture-related diseases. Avoid watering on rainy days, as excess moisture can promote fungal infections. Always check the soil condition and the health of the seedlings before deciding how much and how often to water.
Fourth, apply fertilizers strategically. During the fruiting stage, use carbon dioxide gas fertilizer to enhance plant growth and resistance. In the later stages, spray a solution of 0.1% urea and 0.3% potassium dihydrogen phosphate to boost the cucumber plants’ ability to fight off diseases. This not only improves yield but also strengthens the plant’s natural defenses against pests and pathogens.
By combining these four key practices—temperature and humidity control, high-temperature treatment, timely irrigation, and proper fertilization—you can significantly reduce the risk of downy mildew and other common plant diseases. These methods are not only effective but also sustainable, helping to maintain healthy crops throughout the growing season.
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