Peanut spot disease is one of the diseases that damage peanuts. In severe cases, the disease rate in the field can reach 100%. In an acute epidemic situation, in a short period of time, a large number of dead leaves of peanuts can be caused, resulting in serious losses of peanuts. symptom: The disease usually produces two types of symptoms, focal spot and pepper spot. Symptoms of common focal spot types usually start at the tip of the leaf and start from the margin of the leaf. The lesions developed in a wedge-shaped manner toward the petioles. They gradually turned green and gradually turned yellow and brown. The edges were often dark brown with yellow halos around them. The early disease department died of grayish-brown, with many small black spots on it. The disease often mixed with leaf spot disease and contained leaf spot lesions in wedge spots. The symptoms of pepper spot type produce small lesions (less than 1 mm in diameter), irregular to round, and even pitted. Lesions often appear on the front of the blade. In the case of a pre-harvest, rainy condition, the disease experienced acute symptoms. A round or indefinite dark brown water-stained large plaque is formed on the leaves, rapidly spreading to the entire leaf withered and developing to petiole, stem, and fruit pin. Pathogens and the law of occurrence: Peanut spot is a fungal disease that occurs in the leaves. The bacteria used hyphae and capsule shells to survive winter in the diseased plants. The asthenospores proliferation peaks at the morning dew and the beginning of rainfall. The temperature is 25-27°C and the relative humidity is 70%-74%, which is conducive to the occurrence of coccoliosis. Control methods: Agricultural control: Adopting crop rotation, deep turning, burying diseased plant residues, appropriate early sowing, lowering density, and covering plastic film have good control effects. Chemical control: 1:2:200 times (copper sulfate: lime: water) Bordeaux mixture, or 75% chlorothalonil 500 ~ 800 times solution, or 70% mancozeb WP wetted 300 ~ 400 times liquid control. Disease prevention and control index with 10% to 15% diseased leaf rate, disease index 3 to 5 when the first spraying, after the development of the disease, separated by 10 to 15 days spray 1, disease heavy spray 2 to 3 times. RP International Ltd is top Food Flavourings Supplier and Manufacturer in China. Food Flavourings Food Flavourings,Food Grade Flavourings,Food Additives Flavourings,Flavor Enhancer RP International Ltd , http://www.rp-foodadditives.com
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