How does peanut sheath blight occur? How to prevent and cure?

How does peanut sheath blight occur? How to prevent and cure? (1) incidence regularity: peanut sheath blight is a disease caused by basidiomycetes. The young hyphae are colorless and yellowish brown when mature; they are branched, constricted obviously at the branches, and there is a septum not far from the branches. The mycelium on the surface of diseased tissue can form sclerotia, the surface of sclerotia is rough, at first white, then becomes dark brown, nearly spherical, oblate or irregular, the sclerotia is black inside and outside, and the protruding invagination is honeycomb. The pathogen likes high temperature and high humidity, and the suitable temperature for development is 28-31. The pathogen overwintered with sclerotia or mycelium in the remnants of diseased plants or in soil. Under suitable environmental conditions, sclerotia germinated and grew hyphae, invaded from the natural orifice and infected neighboring healthy plants by contact. The sclerotia of the disease department can also spread and re-infect by wind, rain and running water. High temperature and heavy rain, stagnant water in peanut field, over application of nitrogen fertilizer, closed field and high humidity are beneficial to the occurrence of sheath blight. The sheath blight of previous crops is serious, and so is peanut sheath blight. (2) Control methods: ① does not grow peanuts in rice fields with serious sheath blight. Peanut fields should be drained in time, reduce field humidity, apply appropriate amount of nitrogen fertilizer, increase phosphorus and potassium fertilizer, and reasonable close planting. ② uses 2% Jinggangmycin 800g 1000 times liquid, spray solution 60kg / mu, or 5% Tianan emulsion (methyl arsenate amine) 150g 200g, 50% carbendazim wettable powder 100g, 70% methyl thiophanate wettable powder 100g, 50% wenkuli emulsion 100g, spray 60kg / mu of water.