草地贪夜蛾和斜纹夜蛾卵块表面鳞毛层对夜蛾黑卵蜂寄生效能的影响

Effect of egg masses scale layer on the parasitic efficacy of Telenomus remus against Spodoptera frugiperda and Spodoptera litura

草地贪夜蛾Spodoptera frugiperda是近期入侵我国的重大迁飞性害虫。夜蛾黑卵蜂Telenomus remus是鳞翅目夜蛾科害虫卵期的重要寄生性天敌。本试验以有和无鳞毛层的草地贪夜蛾和斜纹夜蛾S.litura卵为寄主,揭示寄主卵块表面鳞毛层对夜蛾黑卵蜂寄生适应性的影响。结果表明:两种寄主的卵块,无论有无鳞毛层,夜蛾黑卵蜂对卵块寄生率均达到100%,卵粒寄生率均超过95%;且对夜蛾黑卵蜂子代羽化率和个体大小均无显著影响。但无论有无鳞毛层,斜纹夜蛾卵中夜蛾黑卵蜂的羽化率均显著高于草地贪夜蛾。研究结果说明寄主卵块表面的鳞毛对夜蛾黑卵蜂的寄生作用无显著影响。

Spodoptera frugiperda is a major migratory pest and has invaded our country recently.Telenomus remus is an egg parasitoid of Noctuidae insects.In this paper,the egg masses of S.frugiperda and S.litura with or without scale layer were used as hosts to study the effect of scale layer on the parasitic efficacy of T.remus against the hosts.The results showed that for the egg masses of the two hosts,regardless with or without the scale layer,the parasitic rates of the T.remus to egg masses all reached 100%,and the parasitic rates to the eggs all above 95%.Meanwhile,the emergence rates and body sizes of the offspring wasps came from the egg masses with or without scale layers showed no significant difference.But the emergence rate of the T.remus from the eggs of S.litura was significantly higher than that from the eggs of S.frugiperda,regardless with or without the scale layer.These results suggested that the scale layer on the egg mass has no effect on the parasitic efficacy of the T.remus.