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Tomato early blight
In the early seedling stage, a dark brown spot appears at the base of the stem, forming a slightly sunken ring-like pattern. As the plant progresses to the adult stage, the first signs of infection show as dark green lesions on the leaves. These lesions gradually expand into round or irregular shapes, with a lighter green or yellow halo around the edges. The center of the lesion often develops concentric rings, and the affected areas become moist and soft. A black mold layer may also appear on the surface of the lesions. The disease typically starts from the lower part of the plant and spreads upward. In severe cases, the middle portion of the leaf may fall off. Stem infections commonly occur at the base of branches or petioles, showing as brown to dark brown, irregularly shaped spots that are either round or oval. These lesions are sunken and sometimes cracked, leading to significant damage and fragmentation of the stems.
To prevent and control the disease effectively, it's important to apply sufficient organic fertilizer and ensure timely irrigation and nutrient management. For foliar treatment, you can spray a solution of 70% fungicide at a dilution rate of 500 to 600 times. Regular monitoring and early intervention are crucial to minimize the spread and impact of the disease. Maintaining good field hygiene and proper spacing between plants can also help reduce the risk of infection. If the condition worsens, consider adjusting your management practices and consulting local agricultural experts for tailored recommendations.