甲氧虫酰肼对棉铃虫生长发育的亚致死效应研究

以一个对甲氧虫酰肼具有18.5倍抗性的棉铃虫Helicoverpa armigera(Hübner)种群(R)和其同源对照种群(S)为对象,研究了甲氧虫酰肼对棉铃虫生长发育的亚致死效应。结果表明,甲氧虫酰肼亚致死剂量(LC25)处理R和S种群的3龄初幼虫,对S种群幼虫的生长抑制率(37.30%)显著大于R种群(21.20%)。与空白对照处理相比,致死剂量处理R和S种群后,均表现出生长发育延缓,蛹期延长,化蛹率、羽化率、卵孵化率降低,且对S种群的影响更明显。研究结果表明亚致死剂量的甲氧虫酰肼对棉铃虫存在一定的不利影响,但对甲氧虫酰肼具有一定抗性的棉铃虫种群能够减轻这种不利影响。

Sublethal effects of methoxyfenozide on the growth and development of Helicoverpa armigera

A methoxyfenozide-resistant population （R,18.5-fold resistance） of the cotton bollworm （CBW）,Helicoverpa armigera （Hübner） and a homologous control population （S） were used to evaluate the sublethal effects of methoxyfenozide on this insect pest.The results indicate that a sublethal dose of methoxyfenozide（LC25） significantly inhibited the growth of 3rd instar larvae of the S by 37.30%,compared to 21.20% in the resistant population.A sublethal dose retarded CBW growth,prolonged the pupal period and reduced the pupation,emergence and hatching rates of both populations,but especially the S.The results suggest that sublethal doses of emamectin benzoate have negative effects on the growth and development of H.armigera,but resistant populations have reduced negative effects.