常用杀虫剂对小菜蛾天敌卷蛾分索赤眼蜂的影响
Effect of conventional insecticides on Trichogrammatoidea bactrae
王德森1,吕利华2,何余容1**,覃松生1,潘飞1
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作者单位：1华南农业大学昆虫学系 广州 510642； 2广东省农科院植保所 广州 510640
中文关键词：杀虫剂， 小菜蛾， 卷蛾分索赤眼蜂， 影响
英文关键词：pesticides, Plutella xylostella, Trichogrammatoidea bactrae, effect
中文摘要：
在实验室条件下测定田间常用的11种杀虫剂对小菜蛾Plutella xylostella（L.）卵寄生性天敌卷蛾分索赤眼蜂Trichogrammatoidea bactrae Nagaraja的影响。结果表明，高效氯氰菊酯、丁醚脲、阿维菌素、多杀霉素、溴虫腈、氟虫腈和杀螟丹对卷蛾分索赤眼蜂成蜂有极明显触杀毒性，成蜂接触药膜8 h后的死亡率达到89.31%～100%，丁醚脲、阿维菌素和多杀霉素能极显著降低成蜂的寄生力，溴虫腈和氟虫腈处理卵和幼虫期均显著降低卷蛾分索赤眼的成蜂羽化率，杀螟丹对卷蛾分索赤眼蜂各虫态都有极强的毒性，其处理后成蜂的羽化率几乎都为0。试验结果说明，氟啶脲、茚虫威、苏云金杆菌和虫酰肼对卷蛾分索赤眼蜂成蜂及各发育虫态均较安全，可在田间任何时候使用，而高效氯氰菊酯、丁醚脲、多杀霉素和阿维菌素的使用则应尽量避开卷蛾分索赤眼蜂成蜂期。
英文摘要： Under laboratory conditions, effect of 11 kinds of insecticides on Trichogrammatoidea bactrae Nagaraja, an egg parasitioid of Plutella xylostella（L.）, were determined. Betacypermethrin, diafenthiuron, avermectins, spinosad, chlorfenapy, fipronil and cartap had the most significant effect on the survival of adults of T. bactrae, and the mortalities of adults were 89.31%-100%, when they were subjected to the toxic film for 8 hours. Diafenthiuron, avermectins and spinosad had the most significant effect on parasitism capacity of adults of T. bactrae, when they were subjected to the toxic film for 1 hours. Chlorfenapy and fipronil were harmful to egg and larva when the parasitized host eggs at different developmental stages (egg, larva, prepupa, and pupa) of T. bactrae were dipped in the insecticidal solutions.The eclosion rate of adults were reduced significantly. However, cartap had an adverse effect on the T. bactrae and resulted in a low emergence rate of nearly 0 on every treated stages. Based on above results, chlorfluazuron, indoxacarb, Bt and tebufenozide were considered safe to T. bactrae, suggesting that these insecticides are compatible to this parasitoid when being used for control of P. xylostella.