In the seedling stage, the stem base of the seedlings develops a dark brown spot, with a slightly concave ring pattern. In the adult stage, the leaves appear dark green lesions at the beginning of the disease. After expansion, they are round or irregular. The edges are more light green or yellow halo, the middle is concentric ring, and the lesions are wet. Black mold layer grows. The diseased leaves generally develop upward from the lower part of the plant, and when the disease is severe, the middle piece falls off. Stem lesions are often found at the base of the branches and petiole, brown to dark brown irregular round or oval lesions, depressions, and sometimes cracks, causing severe fragmentation.
Comprehensive prevention and control: Apply sufficient organic fertilizer, irrigation and fertilizer should be timely; spray application can use 70% product run dry agent 500-600 times liquid.
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