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 in the early flowering period, and black spot disease was later, and it took place during the needle drop period. Therefore, there are more brown spots on the lower leaves, black spot on the upper leaves, and black spot on autumn peanuts, and brown spots on spring peanuts. Both diseases can harm the leaves, petioles, stems, ovary, stalks, and pods. When they are severe, they can cause defoliation. The plants are early to dry, affect the accumulation of nutrients and cause the pods to be impractical, reduce the kernel rate and oil content, and easily fall fruit when harvested. And the 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. The effective control measures for peanut leaf spot are as follows:
Rotation of peanuts in paddy crop rotations is better than rice rotation. Dry land, peanuts and maize, sweet potato, cassava and other dry land crop rotation, 2 to 3 years in a round, can significantly reduce the leaf spot damage.
Improve the soil to improve the cultivation conditions, increase organic farmhouse fertilizer, improve the soil and enhance the resistance of peanuts.
The selection of disease resistant varieties for planting spring peanuts or autumn peanuts requires selection of varieties with strong resistance to leaf spot disease.
Chemicals can be controlled by the following commonly used agents: 50% colloidal sulfur; 0.5% to 1% over-lime Bordeaux mixture plus soy flour (0.2%) or rosin extender (0.4%) or neutral soap as sticking agent; 0.3% limestone Mixture; 75% chlorothalonil 600 times liquid, etc., have a good effect on the control of leaf spot disease.
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