After the cucumber starts producing fruit, the humidity inside the greenhouse increases due to the application of fertilizers and irrigation. This rise in moisture creates an ideal environment for bacterial growth. At this stage, it's crucial to manage humidity levels and apply pesticides promptly to enhance the plant’s resistance and promote healthy growth, thereby preventing the spread of pathogens.
On sunny mornings, the temperature should be maintained between 25–30°C. This range supports normal flowering and pollination. However, if there are prolonged periods of cloudy, rainy, or foggy weather with temperatures below 22°C, it can hinder nutrient synthesis, disrupt flowering, and weaken the plant’s immunity.
On days when the temperature rises above 30°C in the morning, it's important to ventilate the greenhouse to cool down the air. Once the temperature drops to 23–25°C, close the vents and maintain proper moisture levels. During the middle of the night, keep the temperature between 15–20°C to support optimal plant development.
On cloudy days, if there is fog in the morning, once the greenhouse temperature reaches 12°C, open the vents for 20–30 minutes before closing them again. At noon, even without sunlight, allow ventilation for 1–2 hours. In the evening, if it remains cloudy, open the curtains to let in fresh air.
According to China Pesticide Network, here are some effective prevention methods:
1) Chemical Control: Use a 50% Dithane (copper succinate) solution diluted at 500 times, a 72% Streptomycin solution diluted at 4000 times, a 77% Kocide (mancozeb) solution diluted at 1200 times, or a 12% copper oxychloride emulsifiable concentrate diluted at 600 times. These products should be alternated and applied every 4–5 days, with up to 3–4 applications as needed.
2) During the early stages of disease: On overcast days, use smoke or dust formulations for prevention and treatment. Common dusting agents include 5% chlorothalonil fungicide dust, 10% frostgram dust, and 5% metoxyl dust. These help control fungal diseases effectively.
By maintaining proper environmental conditions and using appropriate pesticide strategies, you can ensure healthier cucumber plants and reduce the risk of disease outbreaks.
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