Leaf spot disease is an important disease in the production of mung bean. Leaf spot disease harms the stems, leaves and pedicels of mung bean. At the beginning of the disease, water spots appear on the leaves, and then expand into round or irregular yellowish brown to dark red spots. The center of the lesion is gray, the edge is reddish brown to dark brown, and there is a circle of yellow halo around the lesion. In the later period, several lesions are connected to each other to form large necrotic spots, which lead to perforation of the leaves of the plants and premature aging.
According to the China Pesticide Network , leaf spot disease can lead to a 10% to 30% reduction in production, and more than 50% in severe cases, resulting in a serious decline in quality.
The pathogen of leaf spot disease overwinters on soil and plants. In the second year, the pathogens multiply on the plants and spread by wind, rain and seeds. Mung bean seedlings can be affected, and the severity of the disease is closely related to temperature and humidity. The temperature is high (25 ° C ~ 28 ° C), and the air humidity spreads quickly from 85% to 90%. When the temperature reached 32 °C, the disease developed fastest.
The main prevention methods are:
1. The rotation is changed. It can reduce the host of pathogens and is a very effective prevention method.
2. Increase the application of potassium fertilizer. The application of potassium-containing fertilizers and organic fertilizers can enhance the ability of mung beans to resist leaf spot and reduce the degree of damage.
3. Pesticide control. At the time of onset, 50-80 ml of water can be sprayed with 30 kg of water (800---1000 times liquid) or 5% of oxazolol suspending agent 20 g per acre of water 30 kg, and also can be used for Baojida (18 % prochloraz? Copper rosinate (EC) 20 g per acre spray 30 kg of water, or 50% carbendazim WP 800-1000 times solution to prevent mung bean leaf spot. It is performed once every 7 to 10 days, and the disease spread can be controlled usually three times in a row.
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