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Symptoms: The brown spot mainly occurs in the leaves. In severe cases, it also occurs on stems, leaves, petioles, and stipules. In the early stage, the leaves were yellowish-brown or round spots, and after the enlargement, the lesions were brown and brown, with a diameter of 1-10 mm. The back of the leaves is also brown or light brown with a clear yellow halo around it. Black spot and brown spot have roughly the same performance. If the control of leaf spot is not timely, generally reduce production by 10% to 20%, and severe cases can reach 40%. Pests are noctuidae pests.
Control methods: When the rate of diseased leaves of peanut plants reached 10% to 15%, they began to control, sprayed once every 10 to 15 days, and sprayed 2-3 times continuously. Use 50% carbendazim WP 50 ml/mu water to 15? 20 kg evenly spray, or 50% thiophanates 50 ml/mu water to 15? 20 kg evenly spray; also available 75% chlorothalonil can be Wet powder 50 ml/mu water evenly sprayed 15 to 20 kg.
Peanuts are mainly prone to leaf spot disease in the latter stage. Common leaf spot diseases are brown spot and black spot, commonly known as spot disease and black spot disease. Damaged leaves showed damage to chlorophyll, resulting in early flowering and failure of pods.