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中文摘要：
本实验研究了小菜蛾Plutella xylostella L1．高抗CrylAc种群DBMIAc—R（抗性倍数大于1000）及敏感种群DBMlAc．S的生长发育、繁殖等生物特征情况，组建了两种群的生命表，并对其适合度进行了研究。结果表明，DBMlAc。R的产卵量、卵历期、孵化率和化蛹率、蛹重及雌雄比（9：6），均显著低于DBMlAc—S。DBMlAc—R相对于DBMlAc—S的相对适合度为0．5762，表明CrylAc抗性种群在繁殖能力上存在明显的生存劣势。
英文摘要：
A resistant strain （DBM1Ac-R） of Plutella xylostella L. （diamondback moth） with more than 1 000-fold resistance to CrylAc was obtained. Life history characteristics, such as the development and fecundity of susceptible （DBM1Ac-S） and resistant strains, were studied. Life tables were established and the relative fitness cost of developing resistance analyzed. The results show that the DBM1Ac-R strain has distinct reproductive disadvantages, such as a fitness value of 0. 5762, including lower fecundity, hatching rate, pupation rate and sex ratio （ 9 ：δ ） , shorter egg period and lighter pupa weight, compared with the non-resistant DBM1Ac-S strain.
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