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In the Dongchangfu district of the city, many vegetable farmers grow open-field cucumbers. Last year, they faced serious issues with cucumber powdery mildew, which significantly affected their yields due to improper prevention and treatment. As a result, they are now looking for effective ways to control this disease.
According to **China Pesticide Network**, powdery mildew in cucumbers typically occurs during the cooler periods of summer. When humidity is high and light is insufficient, 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. Although these diseases may look similar, the treatment methods differ. Bacterial angular leaf spot, in particular, has become more prevalent in recent years.
Therefore, when leaf spots appear on cucumber plants, it’s important to examine the underside of the leaves first. If a greasy, transparent film is visible, it’s likely a bacterial infection. This distinction is crucial for choosing the right treatment.
For the prevention and control of cucumber powdery mildew, it's recommended to move away from traditional pesticide use and instead adopt newer, more effective options. For early prevention, farmers can use a 27% high-fat film solution diluted at 80 times. At the initial stage of the disease, applying a 2% agricultural antibiotic (120) diluted at 200 times, along with polyoxyethylene at 600 times, can be effective. Additionally, foliar sprays using 10% Shigao water dispersant at 1500 times dilution have shown good results.
By staying informed and adjusting their management practices, farmers can better protect their crops and improve their harvests.