Root rot is one of the common diseases in the cultivation of bean in the greenhouse. When the disease is severe, it causes death, and farmers should pay attention. First, the symptoms The pathogenic bacteria mainly invaded the roots of the bean or the base of the stem, and most of them began to develop after 7 days of emergence, and the growth peaked at 3 to 4 weeks. The diseased plants showed yellowing of the lower leaves, brown or black spots in the diseased areas, mostly spreading from the lateral roots to the main roots, which caused the entire root system to rot or necrosis, and the diseased plants were easy to pull out. In the longitudinal root disease, the vascular bundle was reddish-brown, and when the condition expanded, it extended to the stem. After all the main roots had developed, the shoots and leaves of the shoots were wilting or withered. In wet conditions, the stem stem of the diseased plant has pink mold. Second, the incidence of the law The disease is a kind of soil fax fungus disease caused by the infection of Fusarium solani. The pathogenic bacteria mainly thrive in the soil with mycelium and chlamydospore. They are highly saprophytic and can survive in soil for 10 years or more. The general seeds are not contaminated and mainly rely on rainwater, irrigation water, unfamiliar farmyard manure and agricultural implements, etc., and are invaded into the cortex through wounds. High temperature and high humidity are the conditions for the onset of disease. Soil viscosity, low phlegm water, basal fat, and long-term weight loss are all important conditions for this disease. Third, control methods 1. Agricultural control. More than 3 years rotation with cabbage or onion garlic vegetables. Level land to prevent accumulation of water. Take sorghum deep trench cultivation, reduce field humidity, increase ground temperature, promote root development, and enhance disease resistance. 2. Chemical control. Available 70% thiophanate-methyl wettable powder 600 times or 50% carbendazim powder 500 times or 77% WP 500 times or 70% mancozeb wettable powder 1000 times, each Spray at intervals of 7 days, and spray 2 or 3 times. It is better to use the base liquid spray. Antioxidants Vitamins,Antioxidant Vitamins Tablets,Rubber Antioxygen,Antioxidants Free Radicals SHANDONG BAISHENG BIOTECHNOLOGY COM , https://www.baishengbioproducts.com