Tomato gray leaf spot is a significant disease that affects tomato crops. The disease has a 100% incidence rate when it becomes severe, and if left untreated, it can greatly reduce the yield and quality of the crop. This fungal infection primarily targets the leaves and fruits of the plant, making early detection and intervention crucial for effective control. In the initial stages, small dark spots appear on the leaf surface, often round or irregular in shape. As the disease progresses, these spots expand along the leaf veins, forming irregular patterns. The center of the lesions gradually turns gray or brown, while the affected areas become slightly sunken and thin. Over time, the spots may rupture, create holes, or even fall off entirely. When the fruit is infected, it develops large, round depressions with white moldy growth. These lesions eventually turn brown and then black, leading to fruit rot and significant economic losses. To manage tomato gray leaf spot, proper field management is essential. Farmers should increase the use of bio-organic compound fertilizers and phosphorus-potassium fertilizers to improve plant health and resistance. Foliar sprays such as Aiduo can also be applied to enhance the plant's immunity against diseases. During the early stages of infection, several fungicides can be used effectively. For example, spraying a 52% quick water purification agent diluted at 1800 times, or a 68% water retention agent diluted at 1300 times, can help control the spread of the disease. Additionally, 47% ruixiang WP at 700 times dilution or 75% chlorothalonil WP at 600 times dilution are also recommended. Applications should be made every 7 to 10 days, with 2 to 3 treatments needed for optimal results. Prevention is always better than cure, so regular monitoring and timely intervention are key to keeping tomato gray leaf spot under control. By combining good agricultural practices with appropriate chemical treatments, farmers can significantly reduce the impact of this destructive disease on their tomato crops.

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