The ability of natural enemies to reproduce within cropland and effectively suppress pests is contingent on the acceptability and preferences for plants that occur within agroecosystems as oviposition sites. Within-plant preferences on pole beans as oviposition sites were evaluated in the laboratory choice tests. The acceptability and preference of O. insidiosus females for pole bean, soybean, redroot pigweed, and velvetleaf were evaluated in choice and no-choice tests (respectively) in the laboratory. Observations on the acceptability of green foxtail, orchardgrass, buffalograss, smooth brome, redtop grass, blue grama, and tall fescue as oviposition sites for O. insidiosus were also conducted. O. insidiosus preferred to lay its eggs on the petiole and leaflet petioles of poles beans, and did not distinguish among nodes or petioles of different lengths. Although all broadleaved plants were suitable for egg development, the acceptability of these plants differed significantly, with pole beans being most acceptable and almost no eggs being laid on velvetleaf. Preference tests supported the results of the no-choice tests, with pole bean being the most preferred, and no eggs being laid on the velvetleaf. Green foxtail and orchardgrass were the only monocot species found to be acceptable to O. insidiosus. The implications of soybean monocultures on the reproductive capacity of and biological control by O. insidiosus is discussed, as are possible mechanisms underlying the decision-making process for oviposition.