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在室内用浸叶法累代筛选,建立了抗氯虫苯甲酰胺的小菜蛾Plutella xylostella(L.)种群,通过系统观察法研究了敏感及抗性种群的生物学特性。结果表明:小菜蛾以每代30%～50%的淘汰率筛选10代后,其对氯虫苯甲酰胺的抗性达9.09倍;与敏感种群相比,抗性种群的单雌产卵量下降、雄成虫寿命缩短、幼虫历期延长、幼虫存活率下降、化蛹率降低、蛹重下降、羽化率降低,从而导致抗性种群的净增殖率下降、种群倍增时间延长、内禀增长率下降、相对适合度变小。表明小菜蛾对氯虫苯甲酰胺的抗性在用药初期发展较为缓慢,抗性种群的生物适合度降低,抗性风险相对较低。
In the laboratory, the Plutella xylostella (L.) population against diamondback moth (Plutella xylostella) against chlorantranilol was established by means of leaf dipping in succession. The biological characteristics of susceptible and resistant populations were studied by systematic observation. The results showed that the resistance of P. xylostella to chlorantraniliprole was 9.09 times after being screened for 30 generations by 30% -50% of each generation. Compared with the susceptible population, The larvae survival rate decreased, the pupation rate decreased, the pupal weight decreased, and the emergence rate decreased. As a result, the net reproduction rate of resistant population decreased, the population doubling time prolonged, and the intrinsic rate of increase Decline, the relative fitness becomes smaller. The results indicated that the resistance of P. xylostella to chlorantran has a relatively slow development in the early stage of drug use, the biocompatibility of the resistant population was reduced and the resistance risk was relatively low.