毒死蜱对灰飞虱抗性和敏感种群的亚致死效应比较

Comparison of Sublethal Effects of Chlorpyrifos on Resistant and Susceptible Populations of Laodelphax striatellus

为比较亚致死剂量毒死蜱对灰飞虱抗性和敏感品系种群动态的影响,采用生命表构建法研究了两个品系在亚致死剂量处理下种群生命参数的变化。结果表明,亚致死剂量(LC14)毒死蜱对抗性和敏感品系种群的发展均有明显的抑制作用。与对照相比,抗性和敏感品系若虫死亡率显著上升,发育历期延长,成虫寿命缩短,繁殖力下降,内禀增长率以及相对适合度下降。而且LC14剂量毒死蜱对抗性品系的影响小于敏感品系。药剂处理后,抗性品系繁殖力下降19.89%,明显低于敏感品系(38.29%);相对适合度下降24%,也低于敏感品系(48%)。

In order to study lhe sublethal effect of chlorpyrifos on resistant and susceptible Laodelphax striatellus populations, life parameters of L. vriatellus were analyzed by construction of life tables. The results showed that the population develop ment of the resistant or susceptible strain was significantly inhibited by the sublethal doses of ehlorpyrifos （LC11）. Compared with that of the untrealed populations, nymph mortality was significantly increased, developmental duration extended, adult longevity shortened, fecundity declined, and the intrinsic growth rate and relative fitness decreased in chlorpyrifos treated populations. Moreover, fecundity decline of the resistant strains（ 19.89%） was significantly lower than that of the susceptible strain （39.29%） and relative fitness decrease of the resistant strain（24%） was significantly lower than that of the susseptible strain（48%） after treated with LC14 of chlorpyrifos, implying the less inhibition of chlorpyrifos on the resistant strain than on the susceptible strain.