Annals of the Entomological Society of America (1998) 91, 87-93

M. Cusson, J.R. Barron, H. Goulet, J. Regniere and D. Doucet (1998)
Biology and status of Tranosema rostrale rostrale (Hymenoptera : Ichneumonidae), a parasitoid of the eastern spruce budworm (Lepidoptera : Tortricidae)
Annals of the Entomological Society of America 91 (1), 87-93
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.
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(original language: English)
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Database assignments for author(s): Jacques Regniere, Michel Cusson, Daniel Doucet

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Choristoneura fumiferana	Fir (Abies)	Canada (east)
Tranosema rostrale (parasitoid)	Choristoneura fumiferana	Fir (Abies)	Canada (east)