Control of Bean Diseases in Greenhouse

First, bean rust symptoms: mainly harm leaves, serious cases also harm petioles and pods. At the initial stage of the disease, the back of the leaf produced small yellow spots, then turned rust-brown, raised in the shape of a small pus scar, and then expanded into a pile of summer spores, and the epidermis ruptured and emitted reddish-brown powder. Summer spores. Second, bean powdery mildew symptoms: the main harm to leaves, but also against stems and pods. When the leaves were infected, the yellow-brown spots appeared on the back of the leaves at the initial stage, and after enlargement, they showed purple-brown spots, which were covered with a thin layer of white powder. The pathogen is a fungus of the subphylum ascomycetes. Third, comprehensive prevention and treatment methods: spraying 500 times of 70% metoprolol wettable powder, 600 times of 40% Ruitong wettable powder, 300 times of 50% sulfur suspension and 150 times of Fenbiqing at the initial stage of the disease. 5MUE for 7 days, spray 2MUR 3 times in a row.