Bean anthracnose will produce a lesion in the stem of the plant, with many small black spots, slowly expanding, and the plant will die when the lesion is wrapped around the stem for one week. The disease mainly occurs in the stems of the beans, which produce fusiform or long strips. At the beginning, it is purple-red, the color is light, and it is slightly sunken and even cracked. There are a lot of black spots on the lesions. The disease often occurs in the rainy season. The diseased part is blackened by the growth of saprophytic bacteria and accelerates the disintegration of stem tissue.
Prevention method: It can be sterilized by soaking in warm water of 55-60 degrees Celsius for 15-20 minutes before sowing. The rods should be sterilized with 800-1000 times potassium permanganate solution. After the beans are covered, they can be sprayed twice on the stems and leaves with 50% prochloraz (1000) or 43% tebuconazole (3000 times).
Treatment: You can use 50% prochloraz (1000 times) or 43% tebuconazole (3000 times) to spray on the stalk, which will have a good effect.
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