一、纹枯病小麦纹枯病又称立枯病、尖眼点病,本世纪初以来在江苏省发生逐年加重,已成为麦田常发性病害之一。可导致病株茎蘖死亡,或造成麦株养分与水分运输受阻,影响正常生长发育,粒数、粒重减少,常发区一般减产5%~10%,严重的达20%~40%。1.发生规律纹枯病病程大致可分为5个时期:(1)冬前始病期:麦苗2叶期见病,主要在基部叶鞘上,播后多雨年份,冬前田间病株率可达 First, the sheath blight Wheat sheath blight, also known as blight, sharp point disease, occurred in Jiangsu Province since the beginning of this century has increased year by year, has become one of the frequent wheat diseases. Can lead to the death of diseased plant stems and tillers, or cause the obstruction of nutrient and water transport of wheat plants, affecting the normal growth and development, reducing the grain number and grain weight. Generally, the yield is reduced from 5% to 10% and the severity is up to 20% to 40%. 1. The occurrence of regular sheath blight course can be divided into five periods: (1) pre-winter period of disease: 2-leaf stage wheat seedlings disease, mainly in the basal leaf sheath, rainy days after sowing, Up to