褐飞虱是我区水稻生产上的主要害虫。有关褐飞虱的越冬问题,湖南农科院1958年曾报道以卵在游草上越冬,以后又提出以卵在千金子、双穗雀稗以及再生稻苗上越冬;程遐年等(1979)报道褐飞虱越冬北限以一月分平均12℃为等温线,在北纬25度以北冬 Nilaparvata lugens is a major pest in rice production in our district. Concerning the overwintering problem of brown planthopper, Hunan Academy of Agricultural Sciences in 1958 reported that overwintering the eggs on the grass, and later proposed that the eggs overwinter on the stems of the golden seeds, the paspalum and the regenerated rice seedlings; Cheng et al. (1979) Northern limit to January average 12 ℃ isotherm, 25 degrees north latitude north winter