沿淮地区属稻麦两熟区，水稻为单季中稻型。近年来杂交稻种植面积逐年扩大，占水稻种植面积的80％。由于杂交稻生长旺盛，植株嫩绿、高大，田间郁闭，病虫发生较重，突出表现为二化螟一代、白叶枯病、揭飞虱、稻曲病、稻粒黑粉病等发生严重。针对一季中稻病虫发生重的特点，结? The area along the Huaihe River is rice-wheat two-cropping area, and the rice is a single-season middle-rice type. In recent years, the acreage of hybrid rice has been expanding year by year, accounting for 80% of the rice acreage. Due to the vigorous growth of hybrid rice, the plants are tender green, tall, field canopy closed, pests and diseases occur heavier, the performance of the second generation rice stem borer, bacterial leaf blight, planthopper, rice smut disease, rice grain smut and other serious . For a season of mid-pest heavy occurrence of characteristics, knot?