How to control diseases by planting mung beans?

How does growing mungbean prevent disease? Please give an introduction to the following three common mungbean diseases for reference: First, virus disease (a) symptoms The disease is very common, with more seedling incidence. In the field, it mainly shows mottled leaves, wrinkled leaves and so on. Plants with mosaic and mottled symptoms at seedling stage when the disease is mild. When the disease is serious, the seedlings appear to be flower and leaf plants with wrinkled leaflets, abnormal leaves, wrinkled mesophyll bulge, forming blister spots, and obvious yellow and green wrinkled leaves. (2) Conditions of disease 1. Sowing diseased seeds causes direct disease. 2. The mung bean field aphid quantity is many, the disease is heavy. 3. Wind and rain add to the weather, causing friction between plants, aggravating infection. (3) Control methods 1. Select disease-free or disease-resistant varieties to control aphids. 2. At the initial stage of disease, spray 20% virus or 20% virus A 500 times solution for prevention and control, spray once every 7~10 days, generally spray 2~3 times. Two, leaf spot disease mungbean disease, initially appeared on the leaves of water-like small spots, later expanded into round or irregular brown spots, later become large necrotic spots, resulting in dry or deciduous. The occurrence of this disease is closely related to temperature and humidity. Under the condition of 85%~90% relative humidity and 25~28℃ temperature, conidia germinated fastest, mycelium grew most vigorously and disease developed fastest at 32℃. In our city is generally mung bean flowering, high temperature after the rain when the disease is heavier. 1. Choose disease-resistant varieties, reasonable density planting, ensure good ventilation in the field. 2. Strengthen field management, pay attention to drainage or scattering after heavy rain. 3. At the early stage of disease, 70% mancozeb 500 times solution, or 41% special bactericidal king 2000 times solution, 20% Landi 500 times solution spray control. Spraying once every 7~10 days and continuously spraying 2~3 times can effectively control the epidemic of diseases. 3. The heart leaves turn yellow at the initial stage of root rot. If the root system is pulled out for observation, the lower part of the stem and the upper part of the taproot are black-brown and slightly depressed. When the stem is dissected, the vascular bundle turns dark brown. When most of the roots rot, the plant withers and dies. (2) Control methods 1. Select disease-resistant varieties and rotate them with non-legume crops for more than 3 years. 2. Cultivate in time, drain water after rain, and improve ground temperature. 3. At the initial stage of disease, 75% chlorothalonil 600 times solution, or 15% putrescine 600 times solution, 70% thiophane methyl 1000 times solution spray, every 7~10 days spray once, continuous spray 2~3 times. If the above chemicals irrigation effect is better. Click for more mung bean planting technology Click for more food crop planting technology