Attempts to enrich the parasite fauna of the European corn borer in Minnesota.
Laboratory experiments were carried out in Minnesota to deterine the adaptability of 4 species of insect parasites to the maize pest Ostrinia nubilalis (Hb.). Lixophaga diatraeae (Tns.) (obtained originally from Trinidad) was able to survive on O. nubilalis, but Apanteles sesamiae Cam. (obtained from South Africa), A. flavipes (Cam.) (collected in Florida) and Chelonus knabi Vier. (collected in Minnesota) did not adapt to the pest. Mass propagation of L. diatraeae together with Macrocentrus grandii Giodanich, Diadegma terebrans (Grav.) (Eriborus terebrans) and Lydella thompsoni Herting (which already parasitise O. nubilalis in Minnesota) was attempted in the laboratory for studies on reproduction, release and ecology, with favourable results. These parasites did not protect crops against injury by the current pest generation, but reduced the population of the subsequent generation.