Abstract
Tranosema rostrale rostrale (Brishke) (subfamily Campopleginae) is a parasitoid of the eastern spruce budworm, Choristoneura fumiferana (Clemens), in Canada and the United States. T. r. rostrale has often been confused with the closely related Enytus montanus (Ashmead), another parasitoid of C. fumiferana. These 2 species are defined and characters distinguishing them are compared and illustrated. A survey across southern Quebec indicates that >99% of all T. r. rostrale/E. montanus-like parasitoids recovered from spruce budworm larvae implanted in fir stands over a period of 1 wk belong to the former species. T. r. rostrale oviposits in all postdiapause instars of C. fumiferana, as well as in several alternative hosts, starting in late May in the Quebec City region. At 20°C, development inside the host takes 14 d and the parasitoid goes through 3 stadia. T. r. rostrale is believed to complete 2 or 3 additional generations on alternate hosts. Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, 1055 du PEPS, P.O. Box 3800, Sainte-Foy, QC, Canada G1V 4C7. Eastern Cereal and Oil Seed Research Centre, Agriculture and Agri-Food Canada, Research Branch, Ottawa, ON, Canada K1A 0C6. Departement de biologie, Universite Laval, Sainte-Foy, QC, Canada G1K 7P4.
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