棉铃虫对氰戊菊酯抗性品系和敏感品系的相对适合度

RELATIVE FITNESS OF FENVALERATE RESISTANT AND SUSCEPTIBLE STRAINS OF HELICOVERPA ARMIGERA (HUBNER)

通过构建棉铃虫Ｈｅｌｉｃｏｖｅｒｐａａｒｍｉｇｅｒａ（Ｈｕｂｎｅｒ）对氰戊菊酯抗性品系（Ｆｅｎ－Ｒ）和敏感品系（Ｓ）的实验种群生命表，比较了一系列生长发育和繁殖特征；并用净增殖率（Ｒ。）来确定两个品系的相对适合度。结果表明，Ｆｅｎ－Ｒ品系与敏感品系相比具有一定程度的繁殖不利性，包括雌蛾交配率降低，每头雌蛾的平均产卵量减少以及较低的卵孵化率；没有观察到Ｆｅｎ－Ｒ品系在生长发育上的不利性。Ｆｅｎ－Ｒ品系相对于敏感品系具有０．６９的适合度。

The effects of fenvalerate resistance on fitness in Helicorerpa armigera (Hubner) were evaluated in terms of developmental and reproductive characteristics'Life tables of Fen-R strain (fenvalerate-resistant) and S strain (susceptible) were also constructed to determine relative fitness by net reproductive rate (Ro). The results indicated that Fen-R strain possessed reproductive disadvantages including percentage of females mated, lower mean number of eggs per female laid and decreased percentage of eggs hatching when compared with the S strain. No developmental defect ofFen-R strain was observed. The Fen-R strain was calculated to have a fitness value of 0.69 relative to the susceptible S strain.