褐飞虱不同地理种群生物学特性的比较

在实验条件下比较了四个(龙州、九宫山、监利、新会)褐飞虱Nilaparvata lugens(Stal)地理种群的发育、繁殖、内禀增长能力等参数的异同。结果表明：1.北迁的迁入当代九宫山种群雌虫降落取食3.6d开始产卵，产卵量平均为522粒，低于其第二代居留型种群的714粒；2.四个种群在若虫l龄、5龄历期上有显著差异(a＝0.05).但决定翅型分化的2、3、4龄历期上无显著差异；成虫寿命、产卵历期无显著差异；新会种群产卵量高于其它三个种群；同龄期若虫的世代存活率，九宫山种群低于其它三个种群；综合反映发育、存活、繁殖等生命信息的内禀增长能力rm差异较小，在0.1874～0.1982间变化。本文还分析了产生上述异同的原因。

A COMPARATIVE STUDY ON BIOLOGICAL CHARACTER- ISTICS OF DIFFERENT GEOGRAPHIC POPULATIONS OF BROWN PLANTHOPPERS NILAPARVATA LUGENS (STAL)

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.