What are the mung bean diseases?

What are the mung bean diseases? What are the main hazards? How to prevent and cure? Please also know the netizens to help introduce the main mung bean diseases are virus disease, leaf spot disease, root rot disease, farming network sorted out the harm of the above diseases and control methods, listed below for netizens' reference. The harm of mung bean virus disease: the virus disease is more common in the seedling stage. The main manifestations in the field are mottled flowers and leaves, wrinkled flowers and leaves, and so on. When the disease is mild, the plants with mosaic and mottled symptoms appear at the seedling stage. When the disease was serious, the seedlings wrinkled and reduced the leafy mosaic plants, and the leaves were deformed, wrinkled, mesophyll raised, forming blister spots, and there were obvious yellow and green wrinkled mosaic. Causes of mung bean virus disease: first, sowing diseased seeds, causing direct disease. Second, there are a large number of aphids in mung bean field and the disease is serious. Third, wind and rain plus weather, resulting in friction between plants, aggravating the infection. Prevention and control methods of mung bean virus disease: method one, select disease-free or disease-tolerant varieties to control aphids. Method 2. At the initial stage of the disease, 20% virus death or 20% virus A500 times liquid spray was selected for prevention and treatment, once every 7-10 days, generally 2-3 times. Harm of mung bean leaf spot: when mung bean is sick, small water-like spots appear on the leaves at first, then expand into round or irregular brown spots, and later become large necrotic spots, resulting in dry or fallen leaves. Under the condition of 85%-90% relative humidity and 25-28 ℃, the conidia of leaf spot pathogen germinated fastest, and the mycelium grew most vigorously and the disease developed most rapidly when the temperature reached 32 ℃. Generally speaking, the disease is more serious at the flowering stage of mung bean and at high temperature after rain. Control methods of mung bean leaf spot: first, select disease-resistant varieties, reasonable close planting to ensure good ventilation in the field. Second, strengthen field management and pay attention to draining or dispersing soil moisture after heavy rain. Method 3. At the initial stage of the disease, 70% mancozeb 500 times solution, or 41% special effect germicidal king 2000 times solution and 20% Landy 500 times solution were selected for spray control. Spraying once every 7-10 days for 2 times can effectively control the epidemic of the disease. The harm of mung bean root rot: the heart leaves turn yellow in the early stage of mung bean root rot. If the root system is pulled out, the lower part of the stem and the upper part of the main root are dark brown and slightly sunken. When the stem is cut open, the vascular bundle turns dark brown. When most of the roots rot, the plants wither and die. Prevention and control methods of mung bean root rot: method 1. Select disease-resistant varieties and rotate with non-legume crops for more than 3 years. Method 2. Ploughing in time, drainage after rain, and raising ground temperature. Methods at the initial stage of the third disease, 75% chlorothalonil was sprayed with 1000 times of methyl topiramate, and sprayed once every 7 to 10 days for 2 times. If the above chemicals are used for irrigation, the effect is better. Click to get more mung bean planting technology click to get more food crop planting technology