小麦纹枯病是我市近两年出现的一种新病害。该病自1997年零星发生以来,由于受品种、气候、栽培、菌源等诸多因素的影响,发生危害逐年加重,发生范围迅速扩展。1999年小麦纹枯病在全市普遍发生,面积达312.1万亩,且已上升为主要病害。受害麦田一般减产5％～10％,严重的可达30％左右,是小麦生产上潜在的危险性病害。 小麦纹枯病是由禾谷丝核菌引起的真菌性病害。小麦全生育期均可发生,其田间病情消长可分为苗期侵染期、越冬 Wheat sheath blight is a new disease in our city in recent two years. Since the sporadic occurrence of the disease in 1997, the occurrence of harm has been increasing year by year due to many factors such as variety, climate, cultivation and bacteria sources, and the scope of the disease has expanded rapidly. Wheat sheath blight occurred in the city in 1999, covering an area of ​​3,121,000 mu and has risen to major diseases. Damage to the wheat fields generally cut 5% to 10%, a serious up to 30%, is a potential risk of wheat disease. Wheat sheath blight is a fungal disease caused by Rhizoctonia cerealis. The whole growth period of wheat can occur, and its field growth and decline can be divided into seedling stage of infection, wintering