1976年我省开始较大面积试种杂交水稻,1977年全省杂稻面积扩大到25万亩。两年实践证明,杂交水稻分蘖力强,穗大、粒多、产量高。但是,当前我省较大面积栽培的南优2号,南优3号等杂稻品种均感染白叶枯病,严重影响杂稻产量,为了进一步了解杂交水稻白叶枯病发生及防治情况,我们重点在罗甸县进行了调查,现将调查情况简报如下: In 1976, a large area of ​​hybrid rice was planted in our province. In 1977, the area of ​​hybrid rice in the province was expanded to 250,000 mu. Two years of practice has proved that hybrid rice tillering ability, spike, grain and more, high yield. However, the hybrid rice varieties Nanyou 2 and Nanyou 3, which are cultivated in a large area of ​​our province, are all susceptible to bacterial leaf blight and seriously affect the yield of hybrid rice. In order to further understand the occurrence and control of bacterial blight in hybrid rice, We focus on investigation in Luodian County, the investigation is now briefed as follows: