Hostname: page-component-848d4c4894-ttngx Total loading time: 0 Render date: 2024-04-30T18:09:16.627Z Has data issue: false hasContentIssue false
  • English
  • Français

Parasite Studies in Two Residual Spruce Budworm (Choristoneura fumiferana (Clem.)) Outbreaks in Quebec1

Published online by Cambridge University Press:  31 May 2012

J. R. Blais
J. R. Blais
Affiliation:
Forest Research Laboratory, P.O. Box 35, Sillery (Quebec 6), Quebec
Get access Rights & Permissions [Opens in a new window]

Abstract

Parasite studies were carried out in two residual spruce budworm outbreaks in Quebec. Investigations were conducted during the last three years of the outbreak in the Lower St. Lawrence region and during the last year of the one in the Saguenay region. In the Lower St. Lawrence region decline of the insect population was initiated through aerial application of DDT over a period of three years, while in the Saguenay region the unfavourable condition of the forest stands apparently kept budworm numbers below peak outbreak levels. The incidence of mortality through the action of parasites was very high during the last year of both of these outbreaks and probably contributed to bringing about their collapse. Meteorus trachynotus Vier. has repeatedly been recovered in abundance during the last year of a number of budworm outbreaks and it was amongst the important parasites recovered in both outbreaks under discussion. Other species, however, that were abundant in one or the other of these two outbreaks had not been recovered in numbers before. The parasite complex and the relative abundance of each parasite species during budworm outbreaks is fairly constant at the time of peak host populations, but it is now apparent that they vary considerably at the time of outbreak collapse. Variations in the presence and relative abundance of alternate hosts probably account for this situation.

Type
Articles
Information
The Canadian Entomologist , Volume 97 , Issue 2 , February 1965 , pp. 129 - 136
Copyright
Copyright © Entomological Society of Canada 1965

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Blais, J. R. 1952. The relationship of the spruce budworm (Choristoneura fumiferana (Clem.)) to the flowering condition of balsam fir (Abies balsamea (L.) Mill.). Canad. J. Zool. 30: 1–29.CrossRefGoogle Scholar
Blais, J. R. 1960. Spruce budworm parasite investigations in the Lower St. Lawrence and Gaspé regions of Quebec. Canad. Ent. 92: 384–396.CrossRefGoogle Scholar
Blais, J. R., and Martineau, R.. 1960. A recent spruce budworm outbreak in the Lower St. Lawrence and Gaspé Peninsula with reference to aerial spraying operations. For. Chron. 36: 209–224.CrossRefGoogle Scholar
Blais, J. R. 1963. Control of a spruce budworm outbreak in Quebec through aerial spraying operations. Canad. Ent. 95: 821–827.CrossRefGoogle Scholar
Blais, J. R. 1964. Account of a recent spruce budworm outbreak in the Laurentide Park region of Quebec and measures for reducing damage in future outbreaks. For. Chron. 40: 313–323.CrossRefGoogle Scholar
Blais, J. R., and Parks, J. H.. 1964. Interaction of evening grosbeaks (Hesperiphona vespertina) and spruce budworm (Choristoneura fumiferana (Clem.)) in a localized budworm outbreak treated with DDT in Quebec. Canad. J. Zool. 42: 1017–1024.CrossRefGoogle Scholar
Dowden, P. B., and Carolin, V. M.. 1950. Natural control factors affecting the spruce budworm in the Adirondacks during 1946–48. J. econ. Ent. 43: 774–783.CrossRefGoogle Scholar
Jaynes, H. A., and Drooz, A. T.. 1952. The importance of parasites in the spruce budworm infestations in New York and Maine. J. econ. Ent. 45: 1057–1061.CrossRefGoogle Scholar
McGugan, B. M., and Blais, J. R.. 1959. Spruce budworm parasite studies in northwestern Ontario. Canad. Ent. 91: 758–783.CrossRefGoogle Scholar
Miller, C. A. 1963. Parasites and the spruce budworm, pp. 228–244. In Morris, R. F. (ed.), The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31, 332 pp.Google Scholar
Morris, R. F. 1954. A sequential sampling technique for spruce budworm egg surveys. Canad. J. Zool. 32: 302–313.CrossRefGoogle Scholar
Morris, R. F. (Editor). 1963. The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31, 322 pp.Google Scholar
Webb, F. E., Cameron, D. G. and Macdonald, D. R.. 1958. Studies of aerial spraying against the Spruce Budworm in New Brunswick. V. Techniques for large-scale egg and defoliation ground surveys 1953–55. Interim Report 1955–58. Forest Biology Laboratory, Fredericton, N.B., 24 pp.Google Scholar