The research interest in pesticides derived from natural products has recently increased because of their compatibility with the environment. However, to be effective natural product pesticides need to be active against target pests while having no adverse effect on natural enemies. Plant extracts from two plant species (Xanthium sibiricum Petr. et Widd. and Syngonium podophyllum Schott) were selected for this study from a screening of 63 species against Myzus persicae (Sulzer) and Lipaphis erysimi (Kaltenbach) on vegetables. The effects of X. sibiricum and S. podophyllum extracts as well as Beta-Cypermethrin EC, Azadirachtin EC, Avermectin EC, Petroleum spray oil and Rotenone on survival, emergence and parasitism of the aphid parasitoids Aphidius gifuensis Ashmead and Diaeretiella rapae M'Intosh were investigated in laboratory studies. The toxicity sequence of pesticides to adult parasitoids was 4.5% Beta-Cypermethrin EC (3000 X ) > 0. 3% Azadirachtin EC (2000 X )>0.6% Avermectin EC (2000 X )> rotenone (800 X ). Adult mortality in the remaining treatments, Petroleum spray oils (400X ), X. sibiricum extract (0. 04gDW/ml) and S. podophyllum extract (0. 04gDW/ml) did not differ significantly from the control. However, for 0.3% Azadirachtin EC and Petroleum spray oil, the emergence rate of the parasitoids was reduced by 14.67% and 18.67% compared to the control. The parasitism of aphid parasitoids was reduced by treatment with 2.5% rotenone (800X ) and 0. 3% Azadirachtin EC (2000X ) while the plant extracts and Petroleum spray oil had no adverse effect on parasitism. Results indicated that alcohol extracts of X. sibiricum and S. podophyllum were safe for the aphid parasitoids tested. Azadirachtin EC and Petroleum spray oil could also be used in an aphid control program if applications were carefully timed to avoid emergence of parasitoids. none