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In the Dongchangfu District of the city, many vegetable farmers grow open-field cucumbers. Last year, they faced a serious problem with cucumber powdery mildew, which significantly affected their yields due to inadequate prevention and treatment. As a result, they are now looking for effective ways to manage this disease. According to **China Pesticide Network**, here's an expert analysis on how to deal with it.
Cucumber powdery mildew typically occurs during the cooler periods of summer. When humidity is high and sunlight is limited, the disease can spread rapidly, reaching up to 50% infection rates in some cases. In addition to powdery mildew, there are other leaf spot diseases that farmers may not be familiar with, such as bacterial angular leaf spot. While these diseases may look similar, the treatment methods differ. Bacterial angular leaf spot, in particular, has become more common in recent years.
If a farmer notices leaf spots on cucumbers, the first step should be to check the underside of the leaves. If there's a greasy, clear film visible, it's likely a bacterial infection. Proper identification is crucial for choosing the right treatment.
For the prevention and control of powdery mildew, it's recommended to move away from traditional pesticide use and instead consider newer, more effective options. For early prevention, farmers can use 27% high-fat film diluted at 80 times. In the initial stages of the disease, a solution of 2% agricultural streptomycin (120) diluted at 200 times, or 20% polyoxin D at 600 times, can be applied. Another option is 10% Shigao water dispersible powder diluted at 1500 times. These foliar sprays can help reduce the impact of the disease and protect the crop effectively.
By staying informed and using the right tools, farmers can better manage powdery mildew and other leaf spot diseases, ensuring healthier crops and better yields.