Evaluation of toxicity of some new insecticides against egg parasitoid Trichogramma chilonis (Ishii) (Hymenoptera: Trichogrammitidae)

Toxicity of some new insecticides viz.,spinosad,lufenuron,flubendiamide,chlorantraniliprole,emamectin benzoate and imidacloprid were tested against immature and adult stages of trichogramma chilonis (ishii) (hymenoptera: trichogrammitidae) under laboratory conditions. exposure of spinosad to t. chilonis resulted in the lowest emergence at all the parasitism situations. the application of emamectin benzoate and lufenuron after 1st day parasitism,imidacloprid,emamectin benzoate and lufenuron after 3rd day parasitism,imidacloprid,emamectin benzoate,flubendiamide and lufenuron after 4,5 and 7 days of parasitism,respectively showed minimum effect on the emergence of t. chilonis and were found to be safe to the parasitoid. after 8-days parasitism,chlorantraniliprole resulted in maximum emergence of t. chilonis and did not show significant difference with lufenuron and emamectin benzoate. chlorantraniliprole showed maximum survival (42%) and did not differ significantly with lufenuron with 36% survival at 3 h post application. emamectin benzoate was found to be a toxic insecticide which resulted in minimum survival of the parasitoid with 18.0% and did not show significant differences to those of imidacloprid with 22.0% survival. all the insecticides showed non-significant difference with one another on the survival of t. chilonis adults recorded 24 h post application and found toxic to the adults of t. chilonis regarding survival range between 8.0 to 14.0% as against control treatment with 92.0% survival of t. chilonis adult. © 2012 zoological society of pakistan.