多杀菌素对小菜蛾及其天敌的毒力研究

Toxicity of spinosad to Plutella xylostella（L.）and its natural enemies

摘要: 研究评价多杀菌素（菜喜）对小菜蛾及其主要天敌的毒力结果表明，菜喜对小菜蛾具有很高的毒力和良好的田间防治效果，菜喜对青翅蚁型隐翅虫和菜蛾绒茧蜂具有直接杀伤作用，其1000倍稀释液24h使菜蛾绒茧蜂死亡率达62.2%，36h死亡率达88.7%，药液直接处理寄生蜂茧或饲喂均导致很高的死亡率，但对拟环纹狼蛛影响较小。多杀菌素对小菜蛾有很好的控制效果，但对小菜蛾天敌，特别是寄生蜂有相当的负面影响。

Abstract: The toxicities of spinosad to Plutella xylostella and its natural enemies are evaluated in this paper.The results show that spinosad has a high toxicity to P.xylostellaand a high efficacy against the pest in fields.Spinosad has a lethal effect on Paederus fuscipes and C.plutellae，but no significant effect on Lycosa psedoannulata.For C.plutellae，the treatment with 1000 times dilution of 2.5% CAIXI causes its mortality of 62.2% after 24h and 88.7% after 36h.The side-effects of spinosad on parasitoid of P.xylostella are very high and should be considered when the pesticide is used.