Two biological control agents, the parasitic waspBracon hebetorSay, and the predaceous bug,Xylocoris flavipes(Reuter), are currently being evaluated for control of stored-product insects.B. hebetorcommonly attacks larvae of certain stored-product moths such asGalleriaandEphestia(Sweetman 1958). Reinert and King (1971) interactedPlodia interpunctella(Hübner) with different densities ofB. hebetor, to determine which level provided best control. Jay et al. (1968) found thatX. flavipessuppressed 4 species of stored-product Coleoptera in the laboratory. Arbogast et al. (1971) showed thatX. flavipescan be reared on eggs and 1st-stage larvae ofP. interpunctella. The purpose of our study was to determine whether control ofP. interpunctellawould be enhanced or reduced by using these 2 biological control agents simultaneously.