none Enter In this study, the effects of four insecticides including: Pirimicarb, Pymetrozine, Imidaclopride, and Dimethoate on life table parameters of the aphid parasitoid, Diaeretiella rapae (McIntosh) (Hymenoptera: Braconidae) were investigated. The Parasitoid colony was reared on Schizaphis graminum (Rondani) (Homoptera: Aphididae) in a growth chamber at 25 [plus or minus] 1 [degrees]C, 60-70% R.H. and a ph otoperiod of 16 L: 8 D hours. Life table parameters were determined by offering 100 greenbugs to the female parasitoids on wheat leaves daily. Our results indicated that pupa was less susceptible to all tested insecticides to compare with adults, so that Pirimicarb, Imidaclopride and Dimethoate killed all treated parasitoid adults in their field application rates. Furthermore, Pymetrozine caused 27% mortality in adult stage and significantly reduced parasitoid's life table parameters in comparison to the control. No mortality was observed in treated mummies by Pymetrozine and this poison didn't indicate significant effects on life table parameters of emerged wasps from treated mummies and so was seems to be the most selective insecticide. Dimethoat indicated considerable reduction in emergence rate of wasps from mummies. The lowest intrinsic rate of increase (rm), net reproductive rate (R0) and finite rate of increase ([lambda]) (0.31[plus or minus]0.0069, 24.3 [plus or minus]1.1 and 1.37 [plus or minus]0.009, respectively) was estimated for Pirimicarb. Based on the results, chemicals should be applied, if necessary, when most parasitoid populations are at pupal stage inside mummies. Application of selective insecticides such as Pymetrozine for parasitoid conservation was also recommended. 2012