Hostname: page-component-586b7cd67f-vdxz6 Total loading time: 0 Render date: 2024-11-28T11:32:40.108Z Has data issue: false hasContentIssue false
  • English
  • Français

CHANGES IN SPRUCE BUDWORM DEFOLIATION WITH CROWN LEVEL

Published online by Cambridge University Press:  31 May 2012

Harald Piene
Harald Piene
Affiliation:
Canadian Forest Service - Fredericton, PO Box 4000, Fredericton, New Brunswick, Canada E3B 5P7
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.

Detailed estimates of defoliation caused by spruce budworm [Choristoneura fumiferana (Clem.)] over the crown length of young balsam fir [Abies balsamea (L.) Mill.] were made throughout a spruce budworm outbreak from 1976 to 1984 in the Cape Breton Highlands, Nova Scotia. The results show no clear tendency for a particular level of the crown to be damaged more heavily than any other. Thus, there is no reason to continue the common practice of taking samples from the mid-crown level on the assumption that they represent an ‘average’ level of defoliation either for high or low populations. Sampling from the bottom of the crown should provide a more convenient and cost-effective approach for estimating defoliation.

Résumé

Des estimations détaillées de la défoliation par la Tordeuse des bourgeons de l’épinette, Choristoneura fumiferana (Clem.), à tous les niveaux de feuillage chez déjeunes sapins baumiers, Abies balsamea (L.) Mill., ont été relevées pendant toute l’épidémie de tordeuses de 1976 à 1984, dans les hautes terres de l’île du Cap-Breton, Nouvelle-Écosse. Les résultats ont démontré qu’il n’y a pas de tendance particulière à ce qu’un niveau du feuillage soit plus endommagé que tout autre. Il n’y a donc pas de raison de continuer à échantillonner plus particulièrement le niveau moyen du feuillage sous prétexte que ces échantillons représentent un degré ’moyen’ de défoliation tant pour les populations de haute densité que pour les populations de faible densité. L’échantillonnage du feuillage inférieur constitue une approche plus commode et moins onéreuse d’estimation de la défoliation.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 128 , Issue 6 , December 1996 , pp. 1109 - 1113
Copyright
Copyright © Entomological Society of Canada 1996

References

Blais, J.R., DeBoo, R.F., and Auger, M.. 1981. Comparison of early and late timing of spray applications for control of spruce budworm in Quebec. Canadian Journal of Forest Research 11: 538–544.CrossRefGoogle Scholar
Dorais, L., and Kettela, E.G.. 1982. A Review of Entomological Survey and Assessment Techniques used in Regional Spruce Budworm, Choristoneura fumiferana (Clem.), Surveys and in the Assessment of Operational Spray Programs. Report of the Committee for Standardization of Survey and Assessment Techniques. Eastern Spruce Budworm Council, Gouvernement du Québec. 43 pp.Google Scholar
Fettes, J.J. 1950. Investigations of Sampling Techniques for Population Studies of the Spruce Budworm on Balsam Fir in Ontario. Forest Insect Laboratory, Sault Ste. Marie, Ontario, Annual Technical Report 4: 401 pp.Google Scholar
Ford, R.P. 1980. Spruce Budworm in a White Spruce Plantation. United States Department of Agriculture, Forest Service, Broomall, Pennsylvania, Evaluation Survey NA–FB/P–5: 4 pp.Google Scholar
MacGillivray, H.G. 1952. Defoliation, damage and foliage production. pp. 284–370 in The Green River Project, Annual Report. Unit of Forest Zoology, Division of Forest Biology, Canada Department of Agriculture. 472 pp.Google Scholar
MacLean, D.A., and Lidstone, R.G.. 1982. Defoliation by spruce budworm: Estimation by ocular and shoot-count methods and variability among branches, trees, and stands. Canadian Journal of Forest Research 12: 582–594.CrossRefGoogle Scholar
MacLean, D.A., and Ostaff, D.P.. 1989. Patterns of balsam fir mortality caused by an uncontrolled spruce budworm outbreak. Canadian Journal of Forest Research 19: 1087–1095.CrossRefGoogle Scholar
Miller, C.A. 1977. The feeding impact of spruce budworm on balsam fir. Canadian Journal of Forest Research 7: 76–84.CrossRefGoogle Scholar
Morris, R.F. 1955. The development of sampling techniques for forest insect defoliators, with particular reference to the spruce budworm. Canadian Journal of Zoology 33: 225–294.CrossRefGoogle Scholar
Piene, H. 1981. Early Growth Responses to Operational Spacing in Young Balsam Fir Stands on the Cape Breton Highlands, Nova Scotia. Canadian Forestry Service - Maritimes Region, Information Report M–X–125: 29 pp.Google Scholar
Piene, H. 1989. Spruce budworm defoliation and growth loss in young balsam fir: Defoliation in spaced and unspaced stands and individual tree survival. Canadian Journal of Forest Research 19: 1211–1217.CrossRefGoogle Scholar
Piene, H., and Eveleigh, E.S.. 1996. Spruce budworm defoliation in young balsam fir: The 'green' tree phenomenon. The Canadian Entomologist 128: 1101–1107.CrossRefGoogle Scholar
Sanders, C.J. 1980. A Summary of Current Techniques used for Sampling Spruce Budworm Populations and Estimating Defoliation in Eastern Canada. Canadian Forestry Service, Department of the Environment, Great Lakes Forest Research Centre, Sault Ste. Marie, Ontario, Report O–X–306: 34 pp.Google Scholar
Webb, F.E., Cameron, D.G., and MacDonald, D.R.. 1956. Studies of aerial spraying against the spruce budworm in New Brunswick: V. Techniques for large-scale egg and defoliation surveys 1953–55. Canada Department of Agriculture, Science Service, Forest Biology Laboratory, Fredericton, Interim Report 1955–58. 41 pp.Google Scholar