Symptoms and control of peanut net spot disease

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.

Symptoms of net plaque often occur in the flowering stage, the peak period of the disease is from the pod-forming stage to the mature stage, which mainly damages the leaves. The initial main vein produces round or irregular black-spotted spots, and the green spots 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, nearly round, 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.

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The pathogenesis of the disease is conducive to the occurrence and prevalence of the disease. Plots with high humidity in the field are prone to disease, and the incidence of continuous cropping is heavy.

Control methods to strengthen field management: increase the application of decomposed organic fertilizer and phosphorus, potassium fertilizer, reasonable watering, timely cultivating, improve plant disease resistance, timely removal of sick bodies after harvest. Chemical control: In the initial stage of the disease, 70% mancozeb WP 500-600 times solution, or 75% chlorothalonil WP 700-800 times solution, or 64% chlorpyrifos WP 500 times solution for spray control Spray once every 7 to 10 days, even 2 to 3 times.

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