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The late growth of peanut is mainly prone to leaf spot disease. Common leaf spot disease is brown spot disease and black spot disease, commonly known as spot disease and black spot disease. The damaged leaves showed chlorophyll destruction, resulting in early flowering and insufficient pods.
Symptoms of brown spot disease mainly occur 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 leaf spot disease is not timely, it will generally reduce production by 10% to 20%, and severe cases can reach 40%. The pest is a pest of the Noctuidae family.
Prevention and control of leaf spot disease When the disease rate of peanut plants reaches 10% to 15%, the prevention and treatment begins. The medicine is sprayed every 10~15 days, and sprayed continuously for 2~3 times. Use 50% carbendazim WP 50ml/mu to spray evenly 15~20kg of water, or 50% thiophanate 50ml/mu to spray evenly 15~20kg of water; 75% chlorothalonil can also be used Wet powder 50 ml / mu spray evenly 15~20 kg of water.
The control of the larvae of the Noctuidae is 10% enemy killing 50 ml/mu, evenly spraying 10~15 kg of water or 20% daisy emulsifiable concentrate 50 ml/mu for 10~15 kg of water. Since the peanut leaves are smooth, some adhesives may be added during spraying.
Peanut disease prevention and control
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