Hostname: page-component-78c5997874-j824f Total loading time: 0 Render date: 2024-11-13T11:32:58.775Z Has data issue: false hasContentIssue false

INCIDENCE OF PARASITOIDS ATTACKING ENDEMIC SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) POPULATIONS IN NEW BRUNSWICK

Published online by Cambridge University Press:  31 May 2012

C. A. Miller
Affiliation:
Canadian Forestry Service Maritimes Forest Research Centre, Fredericton, New Brunswick
T. R. Renault
Affiliation:
Canadian Forestry Service Maritimes Forest Research Centre, Fredericton, New Brunswick
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Annual population estimates of spruce budworm, Choristoneura fumiferana (Clem.), larvae and the incidence of larval parasitism were monitored in northern New Brunswick following the collapse of the 1949–1959 epidemic in the region. The most common parasitoid among the very sparse hosts was Synetaeris tenuifemur, although it had been rarely found during the epidemic. Larval parasitism sometimes exceeded 50% but it could not be shown as a key factor associated with changing host abundance.

Résumé

Dans le nord du Nouveau-Brunswick, après que l’épidémie de Tordeuses des bourgeons de l’Épinette eut fortement diminué, les auteurs suivirent de près la population annuelle des larves de la Tordeuse et le taux de parasitisme des mêmes larves. Le parasitoide le plus commun sur les hôtes devenus rares était Synetaeris tenuifemur, bien qu’auparavant, durant l’épidémie, on l’ait alors trouvé rarement comme parasite des larves. Parfois plus de 50% des larves étaient parasitées mais on ne put prouver qu’il s’agissait d’un facteur principal affectant l’abondance des hôtes.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1976

References

Blais, J. R. 1959. Incidence of overwintering parasites in post-outbreak populations of the spruce budworm in Gaspé. Can. Dep. Agric., For. Biol. Div., Bi-mon. Prog. Rep. 15: 1.Google Scholar
Blais, J. R. 1960. Spruce budworm parasite investigations in the lower St. Lawrence and Gaspé regions of Quebec. Can. Ent. 92: 384396.CrossRefGoogle Scholar
Dowden, P. B., Buchanan, W. D., and Carolin, V. M.. 1948. Natural control factors affecting the spruce budworm. J. econ. Ent. 41: 457464.CrossRefGoogle Scholar
Fye, R. E. 1963. The status of the spruce budworm in the Black Sturgeon Lake region of Ontario. Can. Dep. For. Bio-mon. Prog. Rep. 19: 2.Google Scholar
Fye, R. E. 1965. Mortality in artificial populations of spruce budworm under field conditions. Can. Dep. For. Bi-mon. Prog. Rep. 21: 3.Google Scholar
Gage, S. H., Miller, C. A., and Mook, L. J.. 1970. The feeding response of some forest birds to the black-headed budworm. Can. J. Zool. 48: 359366.CrossRefGoogle Scholar
Greenbank, D. O. 1973. The dispersal process of spruce budworm moths. Can. For. Serv., Marit. For. Res. Cent. Inf. Rep. M-X-39. 25 pp.Google Scholar
Mason, W. R. M. 1974. The Apanteles species (Hymenoptera: Braconidae) attacking Lepidoptera in the micro-habitat of the spruce budworm (Lepidoptera: Tortricidae). Can. Ent. 106: 10871102.CrossRefGoogle Scholar
McGugan, B. M. and Blais, J. R.. 1959. Spruce budworm parasite studies in northwestern Ontario. Can. Ent. 91: 758783.CrossRefGoogle Scholar
Miller, C. A. 1963. Parasites and the spruce budworm, pp. 228241. In The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31.Google Scholar
Miller, C. A. and Renault, T. R.. 1963. Notes on the biology of Synetaeris tenuifemur Walley (Hymenoptera: Ichneumonidae). Can. Ent. 95: 2428.CrossRefGoogle Scholar
Royama, T. 1971. A comparative study of models for predation and parasitism. Res. Pop. Ecology, Suppl. 1.Google Scholar
Watt, K. E. F. 1959. A mathematical model for the effect of densities of attacked and attacking species on the number attacked. Can. Ent. 91: 129144.CrossRefGoogle Scholar
Wilkes, A., Coppel, H. C., and Mathers, W. G.. 1948. Notes on insect parasites of the spruce budworm, Choristoneura fumiferana (Clem.) in British Columbia. Can. Ent. 80: 138155.CrossRefGoogle Scholar