Leaf spot of cucumber leaf spot and its control

(1) The disease primarily affects the leaves. In the early stages, large water-soaked lesions appear on the leaf surfaces. These spots gradually dry out but are surrounded by a distinct light green, water-stained halo. The lesions typically measure between 15 to 20 mm in diameter. The center of the lesion becomes thin and papery, with a pale yellow color and is easily torn. A few small black spots may be visible on the affected areas, which are signs of fungal spore formation. (2) The pathogen belongs to the subphylum of fungi, specifically the genus that causes this type of infection. The disease develops most rapidly at temperatures between 25°C and 28°C, and it thrives in high humidity conditions, especially when relative humidity exceeds 85%. The disease tends to worsen over time if not controlled, making early intervention crucial. (3) For prevention and treatment, several effective measures can be taken. First, implement a crop rotation system for more than two years to break the disease cycle. Additionally, enrich the soil with high-quality farmyard manure and apply fertilizers according to scientific guidelines to improve plant health. Second, spray the leaves with fungicides such as Huimanfeng or Green Wind 95 to enhance the plant's natural resistance to disease. Third, manage watering practices carefully and ensure proper ventilation in greenhouses to lower air humidity, which is a key factor in disease development. Finally, when the disease first appears, apply one of the following fungicides: 75% chlorothalonil wettable powder diluted 600 times, 70% mancozeb wettable powder diluted 500 times, 64% antivirus WP diluted 500 times, or 50% benomyl wettable powder diluted 1500 times. Regular monitoring and timely application are essential for effective control.

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