夜蛾黑卵蜂寄生草地贪夜蛾和斜纹夜蛾卵的生物学特性

Biological characteristics of Telenomus remus against Spodoptera frugiperda and Spodoptera litura eggs

2019年7月,我们在贵州黔东南地区采集的草地贪夜蛾Spodoptera frugiperda卵块内发现1种卵寄生蜂,经分子鉴定确认为夜蛾黑卵蜂Telenomus remus。为验证该蜂对草地贪夜蛾卵的寄生效能,本研究以草地贪夜蛾卵为主要研究材料,以斜纹夜蛾Spodoptera litura卵为对照,统计了夜蛾黑卵蜂对这两种寄主卵的卵粒寄生率、单卵出蜂数、雄性比和个体大小等指标。结果显示,夜蛾黑卵蜂对草地贪夜蛾卵和斜纹夜蛾卵的卵粒寄生率均可达到95%以上。与斜纹夜蛾卵相比,草地贪夜蛾卵育出的子代蜂个体较大,但单卵出蜂数相对较低。结果说明夜蛾黑卵蜂是草地贪夜蛾潜在的高效生防作用物,斜纹夜蛾卵可以作为替代寄主用于繁育夜蛾黑卵蜂。本研究将为我国利用夜蛾黑卵蜂防治草地贪夜蛾提供重要参考。

In July 2019,we found a species of egg parasitoid wasp emerged from Spodoptera frugiperda eggs collected in southeast of Guizhou province.This parasitoid species was identified by molecular method as Telenomus remus.To test the parasitic efficacy of T.remus against S.frugiperda and S.litura eggs,we investigated the parasitic rates,offspring number per host eggs,body size,and male ratio of T.remus on S.frugiperda or S.litura eggs.The results showed that the parasitic rates of eggs reached at least 95%regardless of S.frugiperda or S.litura eggs.T.remus offspring emerged from S.frugiperda eggs showed larger body size and lower offspring number per host egg than those emerged from S.litura eggs.Our results revealed that T.remus is a potentially effective biological control agent against S.frugiperda,and S.litura eggs are the potential alternative host for the mass rearing of T.remus.This study will supply a primary reference for the application of T.remus against S.frugiperda.