Immature maize weevils,Sitophilus zeamaisMotschulsky, in corn were exposed toAnisopteromalus calandrae(Howard) alone,Choetospila elegansWestwood alone, or a combination of both species.Anisopteromalus calandraewas much more efficient at parasitizing immature maize weevils in corn than wasC. elegans.The combination ofA. calandraeplusC. eleganshad similar effects asA. calandraealone on total maize weevil mortality for equal numbers of parasitoids. Under interspecific competition, the emergence ofC. elegansprogeny and their sex ratio (percentage female) were significantly reduced in the presence ofA. calandrae, butA. calandraewas not affected substantially byC. elegans.