none The residual contact toxicity of MK-243 (4"- epi- methylamino-4"- deoxyavermectin B- 1 hydrochloride), permethrin, esfenvalerate (pyrethroids) and methomyl (carbamate) to 2 parasitic hymenoptera, Cotesia orobenae (L.) (Braconidae) and Pteromalus puparum (L.) (Pteromalidae), in broccoli was evaluated. Each parasite was caged on treated broccoli leaves at various times after the plants had been sprayed in the field. Methomyl was the only insecticide consistently toxic to P. puparum up to 1 d after the leaves were sprayed, but this compound had no affect 3 d after treatment. MK-243 and the 2 pyrethroids had no significant effect on P. puparum. The effect of the insecticides on C. orobenae was different and less consistent. Esfenvalerate caused significant mortality of C. orobenae, but methomyl and permethrin killed a significant number of parasites in only 1 of the 2 trials. MK-243 was not toxic to C. orobenae in our studies.