近几年,我县小麦纹枯病的危害逐年加重,面积逐渐扩大,已成为影响小麦高产的主要病害之一.现将我们对该病的调查和防治试验结果总结如下. 一、发病情况 1981年前,小麦纹枯病只在我县山区少数生长过旺的麦田有零星发生。1984年全县发病面积达4.76万亩,1985年达15.83万亩,占小麦总面积的73.3％,发病严重的田块病株率为40.3—89.6％, In recent years, the harm of wheat sheath blight in our county has increased year by year, gradually expanding, has become one of the major diseases that affect the high yield of wheat.We now summarize the results of the investigation and prevention and treatment of the disease as follows. Years ago, wheat sheath blight only sporadically sprouted in the few overgrown wheat fields in the mountainous areas of our county. In 1984 the county incidence of up to 47,600 mu, up to 158,300 mu in 1985, accounting for 73.3% of the total area of ​​wheat, the incidence of severe field plots rate of 40.3-89.6%