寄主烟草粉螟冷藏对麦蛾茧蜂适合度的影响

Effects of cold storage of the tobacco moth Ephestia elutella on the fitness of ectoparasitoid wasp Habrobracon hebetor

为评估在5℃条件下冷藏不同时间的寄主烟草粉螟Ephestia elutella对麦蛾茧蜂Habrobracon hebetor适合度的影响,利用年龄-龄期两性生命表评估麦蛾茧蜂在0、15、30和60 d不同冷藏时间烟草粉螟上的发育历期、存活率、繁殖力、种群参数、麻痹率参数、种群数量和麻痹潜能。结果表明,在冷藏30 d的烟草粉螟上,麦蛾茧蜂成虫前期较短,存活率、平均繁殖力和雌成虫比例均最高;内禀增长率、周限增长率和净增殖率等种群参数均优于其他3个冷藏处理;净麻痹率、稳定麻痹率和周限麻痹率等麻痹率参数与其他冷藏处理间均无显著差异,但转化率(0.36)显著低于对照(0.39)和冷藏60 d处理(0.40)。预测结果显示在冷藏30 d的烟草粉螟上麦蛾茧蜂种群数量和麻痹潜能均最大,分别为3587837818头和539670155头。表明麦蛾茧蜂能在冷藏60 d内的烟草粉螟上完成整个世代周期,而冷藏30 d的烟草粉螟最有利于麦蛾茧蜂的规模化繁殖,建议以冷藏30 d的烟草粉螟为寄主繁育麦蛾茧蜂。

In order to evaluate the effects of tobacco moth Ephestia elutella stored at 5℃for different durations on the fitness of ectoparasitoid wasp Habrobracon hebetor,the age-stage,two-sex life table was used to evaluate the developmental duration,survival rate,fecundity,population parameters,paralysis rate,population size and paralytic potential of H.hebetor on E.elutella for different periods of cold storage.The results showed that the pre-adult duration of E.elutella stored for 30 days was shorter,and its survival rate,mean reproduction rate and the proportion of females were the highest.The population parameters such as intrinsic rate of increase,finite rate of increase,and net reproduction rate were higher than those under other three treatments.The net paralysis rate,stable paralysis rate and finite paralysis rate were not significantly different from those in other treatments,but the transformation rate(0.36)was significantly lower than the control(0.39)or under cold storage treatment for 60 days(0.40).The predicted population size and paralytic potential of H.hebetor were the largest on E.elutella stored for 30 days,which were 3587837818 and 539670155,respectively.The results indicated that H.hebetor could complete the whole generation cycle on E.elutella within 60 days of cold storage,and the host stored for 30 days was most beneficial to the mass rearing of H.hebetor.It suggested that cold storage of E.elutella for 30 days was optimal for rearing H.hebetor.