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纹枯病是水稻主要病害,常年发生较重,一般在水稻开始分蘖时明显发生,孕穗至抽穗期前后发病加剧,主要为害叶鞘和叶片,由下向上发展,严重时危害茎秆和穗部[1-2]。田间湿度大,偏施或过量集中追施氮肥,稻株生长势过旺有利于纹枯病发生且病情严重[3]。
Rhizoctonia solani is a major disease of rice, perennial heavy occurrence, usually occurs when the rice began tillering, booting to the heading stage before and after the onset of aggravating, the main damage to leaf sheaths and leaves, the development from the bottom up, and seriously endanger the stem and ear [ 1-2]. Field humidity, partial or excessive concentration of topdressing nitrogen fertilizer, rice plant growth potential is conducive to sheath blight and exacerbations [3].