Symptoms of seedlings cause cataplexy. Lesions in the leaves produce tan irregular spots. An oblong brown ulcer spot develops on the petiole. The stalk stems have spindle-to-strip lesions that spread to the entire stem, causing the stems to dry up, and the surface of the diseased part to have many black and small spots. Pathogen acrophomina phaseoli (Maubl.) Ashbe. called bean shell spore fungus, is a fungus of the subphylum Fungi. The conidia are scattered or aggregated, mostly buried, spherical to oblate spheroidal, dark brown, carbonaceous, 96-163 μm in size. The conidiospores are long spindle to oblong, single cells are colorless, individual twins, size 14-204-9 (μm). Can produce black sclerotia, often mixed with conidia. The optimum temperature for pathogenic bacteria growth is 30-32°C, and the optimum pH is 6-6. Transmission routes and pathogenic conditions The pathogenic bacteria live in the soil with mycelium in diseased tissues or with sclerotia in the soil. The temperature is high, and it is prone to be induced by rain and high humidity. The terrain is low-lying, and the malarial growth or partial application of fertilizers is too severe.
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Prevention methods (1) Three years or more of rotation. (2) After the harvest, remove the diseased body in time and concentrate it deeply or burn it. (3) Proper close planting, reasonable fertilization and watering to prevent moisture retention. (4) Spray 75% chlorothalonil wettable powder 600 times or 80% spray wettable powder 600 times in the initial stage of disease.