Leaf spot disease is mainly prone to occur in the late stage of peanut. Common leaf spot diseases include brown spot and black spot disease, commonly known as spot disease and black spot disease. The damaged leaves are mainly characterized by the destruction of chlorophyll, resulting in early flowering and insufficient pods. Timely pesticide control is a key measure to increase peanut yield.
Symptoms: Brown spot disease mainly occurs in the leaves, and in severe cases, stems, petioles and stipules also occur. On the leaves, the initial yellow-brown round or nearly round small spots, after expansion, the lesions are tan, with a diameter of 1-10 mm. The back of the blade is also brown or light brown with a distinct yellow halo around it. Black spot and brown spot are almost identical. If the leaf spot disease is not timely, the yield is generally reduced by 10%-20%, and the heavy one can reach 40%. The pest is a pest of the Noctuidae family.
Control method: When the diseased leaf rate of peanut plants reaches 10%-15%, the control begins, and the medicine is sprayed every 10-15 days, and it is sprayed 2-3 times continuously. Use 50% fungicide carbendazim wettable powder 50 ml / mu to spray even 15 to 20 kg of water, or 50% methyl thiophanate 50 ml / mu to 15-20 kg of water evenly spray; also available 75% bacteria Clear WP 50 ml/mu spray evenly on water 15-20 kg.
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