小麦纹枯病是由禾谷丝核菌或立枯丝核菌引起的一种土传真菌病害,广泛分布于世界各小麦产区。我国早有发生,但未引起重视。随着小麦种植品种的改变及栽培措施的强化,20世纪70年代中后期,纹枯病在部分地区上升为重要病害。到80年代,我国各冬麦区普遍发生纹枯病,而尤以江淮冬 Wheat sheath blight is a soil borne fungal disease caused by Rhizoctonia cerealis or Rhizoctonia solani and is widely distributed in various wheat producing areas in the world. My country has long occurred, but did not pay attention. With the change of cultivated wheat varieties and the intensification of cultivation measures, sheath blight rose to some important diseases in some areas in the mid and late 1970s. By the 1980s, sheath blight occurred in various winter wheat areas in our country, especially in the JAC winter