Main diseases and control methods of mung bean

With the development of market economy, the planting area of mung bean is expanding year by year, and the diseases of mung bean are also increasing gradually. the following are the main diseases and control of mung bean. First, virus disease (1) symptoms the disease is very common, especially 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. (2) the condition of the disease. Sowing diseased seeds causes direct disease. two。 There are a large number of aphids in mung bean field and the disease is serious. 3. Wind and rain plus weather, causing friction between plants, aggravating the infection. (3) Prevention and control methods 1. Disease-free or disease-tolerant varieties were selected to control aphids. two。 At the initial stage of the disease, 20% virus death or 20% virus A500 times liquid spray was used to prevent and cure the disease, once every 7-10 days, usually 2-3 times. Second, leaf spot disease (1) when the symptom mung bean occurs, there are small water-like spots 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. (2) the occurrence of the disease is closely related to temperature and humidity. Under the condition of relative humidity 85%-90%, the pathogen conidia germinated fastest when the temperature was 25-28 ℃, and the mycelium grew most vigorously and the disease developed most rapidly when the temperature reached 32 ℃. In our city, the disease is more serious when the mung bean is in bloom and at high temperature after rain. (3) Prevention and control methods 1. Selection of disease-resistant varieties, reasonable close planting to ensure good ventilation in the field. two。 Strengthen field management and pay attention to draining or dispersing soil moisture after heavy rain. 3. At the initial stage of the disease, 70% mancozeb solution was selected, or 41% special effect germicidal king 2000 times solution and 20% Landy 500 times solution were sprayed for prevention and treatment. Spraying once every 7-10 days for 2 times can effectively control the epidemic of the disease. Third, root rot (1) the heart leaves turn yellow at the beginning of the symptoms. If the root system is pulled out, it can be seen that 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. (2) Prevention and control methods 1. Select disease-resistant varieties and rotate with non-legume crops for more than 3 years. two。 Ploughing in time, drainage after rain, raise the ground temperature. 3. At the initial stage of the 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.