棉铃虫对甲氨基阿维菌素苯甲酸盐的抗性遗传力

Realized Heritability of Resistance to Emamectin Benzoate in Helicoverpa Armigera(Hbner)

为了评估棉铃虫对甲氨基阿维菌素苯甲酸盐的抗性风险,在室内进行了棉铃虫对该药剂的抗性选育和现实遗传力分析。连续用甲维盐对棉铃虫选育25代,与同源对照种群相比,获得抗性倍数为2.974倍的汰选种群。采用阈性状分析方法,获得棉铃虫对甲维盐的抗性现实遗传力(h2)为0.05218。进一步预测其抗性发展速度,假设以90%致死率继代处理棉铃虫,其抗性达到5倍、10倍分别需要18.67代和26.71代。

In order to evaluate the resistance risk of Helicoverpa armigera to emamectin benzoate,the resistance selection and realized heritability of H.armigera were analysed in the laboratory.The insecticide-treated population developed 2.974-fold resistance to the insecticide comparing with the homologous control population,after 25 generations of resistance selection with emamectin benzoate.Realized heritability（h2） of resistance in selection stages was evaluated based on the Tabashnik＇s methods.The results showed that h2 for the entire selection experiment was 0.05218.To predict the development of resistance,it required 18.67 and 26.71 generations of H.armigera to obtain 5-fold and 10-fold increase of emamectin benzoate in LC50 under selection pressure at 90% mortality for each generation of selection.