褐稻虱(Nilaparvata lugens Stal)是我国水稻的重要害虫,近十多年来,大发生频率增高,发生为害区域扩大,为害程度加重,对水稻生产威胁甚大。褐稻虱的发生与为害受虫源、气候、天敌、水稻生育期、栽培制度及防治情况等多种因素的影响,而虫源、天敌、水稻生育期和栽培制度又与气候条件有关。近年来,我们在全国褐稻虱科研协作组统一计划下,对褐稻虱在我国的发生与为害区域分布和季节性迁飞的气候 Nilaparvata lugens Stal (Nilaparvata lugens Stal) is an important pest of rice in our country. In the recent ten years, the occurrence frequency of Nilaparvata lugens Stal has been increased and the damage area has expanded. The occurrence and damage of brown planthopper are affected by many factors such as insect source, climate, natural enemies, rice growth period, cultivation system and control situation, etc. Insect source, natural enemies, rice growth period and cultivation system are also related to climatic conditions. In recent years, under the unified plan of the National Cooperative Research Group on Brown Planthopper, we have studied the regional distribution and seasonal migration of brown planthopper in China