Peanut leaf spot disease is a disease caused by two kinds of pathogens, namely black spot of peanut and brown spot of peanut. These two diseases belong to different species. Peanut brown spot occurred early, appeared at the early flowering stage, and black spot disease was later. Therefore, brown spots are more common in the lower leaves, and black spot is mostly in the upper leaves. Black spot is more prominent in autumn peanuts, and brown spot is more common in spring peanuts. Both diseases can harm the leaves, petioles, stems, ovary, stalks, and pods. When they are severe, they cause fallen leaves. The plants are early to dry, affecting nutrient accumulation and causing the pods to be unfilled, reducing the rate of kerneling and oil content, and easily dropping the fruit when harvested. Seeds germinate. The main reasons for the occurrence of leaf spot disease in peanuts are closely related to the short rotation period, high temperature and high humidity environment, weak disease resistance of varieties, poor sandy land, and insufficient fertilization. Peanut leaf spot disease prevention and control methods are as follows: First, rotation. Peanut implements a dry and dry rotation, and it works better with rice. Dry land, peanuts and corn, sweet potato, cassava and other dry land crop rotation, 2-3 years round, can significantly reduce the leaf spot disease damage. Second, improve the soil. Improve the cultivation conditions, increase organic manure fertilizer, improve the soil, and enhance the disease resistance of peanuts. Third, the selection of disease-resistant varieties. To plant spring peanuts or autumn peanuts, it is necessary to select varieties with strong resistance to leaf spot disease. Fourth, chemical control. The following commonly used agents can be used: 1, 50% colloidal sulphur; 2, 0.5-1% over-lime Bordeaux mixture plus soy flour (0.2%) or oleoresin (0.4%) or neutral soap as sticking agent; 3, 0.3 % of lime sulfur; 4,75% of chlorothalonil 600 times, etc., have good effect on the control of leaf spot disease.

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