none Emulsifiable concentrate (EC) formulations of four synthetic pyrethroids namely decamethrin, permethrin, fenvalerate and cypermethrin were tested against four parasitoids Apanteles angaleti Muesebeck, Bracon kirkpatricki (Wilkinson). Chelonus blackburni Cameron (Hymenoptera, Braconidae) and Eucelatoria bryani Sabrosky (Diptera, Tachinidae). Adults were exposed to filter paper impregnated with pyrethroid solution for six hours and then transferred to untreated vials for observation. synthetic pyrethroids proved nontoxic/less toxic to the hymenopteran parasitoids tested but the tachinid showed differential response to different pyrethroids. Cypermethrin (Cymbush and Volrhocypermethrin) showed low toxicity (6.7 to 10.0% mortality) whereas permethrin exhibited high toxicity (93.3 to 96.7% mortality) to E. bryani .