Vicia faba root rot is a fungal disease, and it is a disease of high temperature and humidity. The incidence in Yunnan is more common, and the incidence is generally severe in the faba bean flowering period. The main damage to the root and stem base, causing the whole plant withered. The primary roots and stem bases of the affected plants are born with water-stained lesions, with black rots, decayed lateral roots, and easy detachment of the cortex. The dense roots of white mold on the surface of the rotten roots are the mycelium of the bacteria and later turn into black particles. Sclerotia of germs. After the stem stems evaporate and dry, it turns gray, the epidermis breaks like a flax, and the inside sometimes has mucus-like black particles.
Prevention and control measures: strengthen field management, timely irrigation in drought, dredge drainage when it is rainy, rational rotation, and no nitrogen fertilizer; reasonably dense planting to ensure good ventilation and light transmission, enhance plant disease resistance, and reduce disease. At the time of sowing, cover with 50% carbendazim 150g mixed dry soil per acre. In the seedling stage, 50% carbendazim was used as a 1000-fold solution to irrigate the roots, or 70% thiophanate-methyl 800-1500 times solution or 65% zeocin WP was applied as a 600-fold solution.
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