Peanut net spot disease, also known as brown spot disease, cloud spot disease, often mixed with leaf spot disease, can cause early peanut leaf loss, seriously affecting peanut yield.
First, the disease law is more likely to occur at the flowering stage. The disease is in the stage of pod formation to maturity, which mainly damages the leaves. The initial veins produce round or irregular black-spotted spots, and there are green circles around the lesions. Then, on the front of the blade, there are irregular brown spots on the edges of the leaves, and small brown spots on the diseased part are visible. When the rain is continuous, the leaf surface lesions are large, dark brown, the leaf back lesions are not obvious, the light brown, the severe lesions are fusion; the lesions are easy to rupture and perforate under dry conditions. Once the leaves are infected, they are easy to fall off.
Second, the prevention and treatment method in the early stage of the disease, using 70% mancozeb WP 500-600 times solution, 75% chlorothalonil WP 700-800 times solution, 64% anti-virus WP WP 500 times, 70 % ethyl phosphorus, manganese zinc wettable powder 500 times liquid or 80% spray wettable powder 600 times liquid, spray once every 10 to 15 days, even spray 2 to 3 times.
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