Abstract: A comparative study on development . Survival. Fecundity and innate capacity for population increase of the four geographic populations of brown planthoppers (BHP) (Nilaparvata lugens) was carried out in laboratory. The four populations were collected from Longzhou . Jiugongshan. Jianli, Xinhui in China. The results show: 1. After a longdistance migration, the Jiugongshan immigrant adult females need to be fed for 3.6 days to begin oviposition. Egg number laid per female is only 522, lower than that in second generation (714) . 2. In second generation, there is significant difference in the durationof the first and fifth instar nymphs among populations, but no significant difference in the second . Third, fouth instar that are key stages determining wing dimorphism, and no significant difference in longevity and oviposition period of adult females too. Egg number of Xinhui population is remarkably higher than those of the other three. At the same instar nymphs the generation specific survival rate of Jiugongshan population is lower than those of the other three. The innate capacity for population increase which can comprehensively reflect the information of development. Survival and fecundity changes slightly between 0.1874 to 0.1982. Furthermore, the reasons for the homogenieties and the heterogeneities above-mentioned are discussed.

Key words: Nilaparvata lugens, geographic population, rm