Peanut net spot disease can not be ignored

Peanut net blotch is one of the diseases that tend to occur in recent years. The disease often causes a large number of leaves in the middle and late stages of peanuts. The average annual yield is reduced by 10%-20%, and the heavy ones can reach more than 30%.

First, the cause: peanut net spot disease is caused by the fungus (Peanut), the bacteria overwinter on the sick body, the next summer, the wind and rain spread to peanuts. Summer and autumn high temperature and high humidity or rainy weather, the disease spread rapidly, can lead to a pandemic. After the spores are produced in the diseased department, they are again infested by storms. The disease is generally in the period from mid-July to the end of August, and there is a peak incidence in the field every 5-10 days after the rain.

Second, the disease: in the early stage of the disease, a star-shaped small black spot is produced on the front of the leaf, and then expanded into a marginal network, irregular and fuzzy dark brown lesions. The lesion does not penetrate the leaf, only the epithelial tissue cells are damaged, causing necrosis. However, there are also lesions that are nearly round and dark brown. The edges of the lesions are clear and the lesions penetrate the leaves. However, the lesions on the back of the leaves are small, and the necrosis of the lesions can form small black spots.

Third, prevention and treatment: First, reasonable irrigation and fertilization, improve peanut disease resistance. Second, in the early stage of the disease, 80% mancozeb 500 times solution or 50% carbendazim 500-800 times solution can be used. The two can also be mixed, and at the same time treat a variety of other leaf diseases. Spray once every 5-7 days, even spray 2-3 times.

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