我县1973年发现小麦纹枯病,1974年发病面积仅749亩,以后迭年上升,至1983年发病面积达2.93万亩,占全县小麦总面积的53.1％。以1980年为例,全县发病2.22万亩,占播种面积5.9万亩的37.63％。亩平产量由338斤下降为292斤,减产46斤,全县共损失小麦271.4万斤。从1980年起,我们对该病的发生规律和防治方法作了一些探索,现简报如下。一、发病情况 In 1973, the county discovered the sheath blight of wheat. In 1974, the disease area was only 749 mu. After that, the area rose to 23,900 mu in 1983, accounting for 53.1% of the total area of ​​wheat in the county. In 1980, for example, the county incidence of 22,200 mu, accounting for sown area of ​​5.9 million mu of 37.63%. Mu flat output dropped from 338 pounds to 292 pounds, cut 46 pounds, the county lost a total of 2714000 kg of wheat. Since 1980, we have made some explorations on the law of occurrence and prevention of the disease and are briefing as follows. First, the incidence