Study on the effects of three pesticides on the emergence rates of Trichogramma at different develoment stages
In order to clarify the effects of commonly used pesticides on parasitoid wasps Trichogramma,the emergence rates of T.japonicum and T.chilonis after treated with avermectin,imidacloprid and pymetrozine at different develoment stages,were determined indoors by egg card impregnation method.The results showed that after treatment with avermectin at egg,larva,prepupa and pupa stages,the emergence rates of parasitoid wasps were significantly decreased.The emergence rates of avermectin on T.japonicum and T.chilonis were 24.77％-43.99％and 35.00％-39.15％,respectively.Avermectin had high safety risks to Trichogramma at immature stages.Imidacloprid and pymetrozin had low risks to Trichogramma,with the emergence rates above 93.82％.Therefore,the application of avermectin should be prohibited after releasing Trichogramma,while imidacloprid and pymetrozine could be used.
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