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DISTRIBUTION, SURVIVAL, AND INTRA-TREE MOVEMENT OF LATE-INSTAR BIRCH CASEBEARER LARVAE ON WHITE BIRCH (LEPIDOPTERA: COLEOPHORIDAE)

Published online by Cambridge University Press:  31 May 2012

A. G. Raske  and
D. G. Bryant
A. G. Raske
Affiliation:
Newfoundland Forest Research Centre, Canadian Forestry Service, St. John's A1C 5X8
D. G. Bryant
Affiliation:
Newfoundland Forest Research Centre, Canadian Forestry Service, St. John's A1C 5X8
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Abstract

The number of the birch casebearer larvae, Coleophora fuscedinella Zeller, within white birch crowns, Betula papyrifera Marsh., decreased 70% from overwintered survivors to about 50% pupae in the population. Within a crown, the highest number occurred in the outer shell and lowest in the inner. Casebearer numbers, weighted by the number of leaf clusters, were highest in the inner shell and lowest in the outer. Among crown quarters, both unweighted and weighted numbers were generally highest in the middle two crown quarters, lowest in the bottom quarter, and variable in the top quarter.

Peaks in immigration and emigration of larvae among crown strata occurred first when third and again when fourth instar larvae were most abundant. Immigration consisted only of intra-tree crawling, but emigration consisted of intra-tree crawling, removal by predation, and larvae leaving the tree to pupate on ground vegetation.

Type
Articles
Information
The Canadian Entomologist , Volume 109 , Issue 10 , October 1977 , pp. 1297 - 1306
Copyright
Copyright © Entomological Society of Canada 1977

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References

Bryant, D. G. and Raske, A. G.. 1975. Defoliation of white birch by the birch casebearer (Lepidoptera: Coleophoridae). Can. Ent. 107: 217–223.CrossRefGoogle Scholar
Canadian Forestry Service. 1974. A. Rep. Forest Insect and Disease Surv., 1973. Environ. Can., Can. For. Serv., Ottawa, 101 pp. (See also reports for years 1970 to 1972.)Google Scholar
Cochran, S. G. 1974. The birch casebearer in Newfoundland. M.Sc. Thesis, McGill University. 126 pp.Google Scholar
Gillespie, A. M. 1932. The birch casebearer in Maine. Bull. Maine For. Serv. 7.Google Scholar
Guèvremont, H. and Juillet, J.. 1974. Recherches sur la dynamique des populations naturelles de Coleophora fuscedinella Zeller (Lépidoptères: Coleophoridae) dans la région de Sherbrooke, Québec. Phytoprotection 55: 121–134.Google Scholar
Morris, R. F. 1955. The development of sampling techniques for forest insect defoliators, with particular reference to the spruce budworm. Can. J. Zool. 33: 225–294.CrossRefGoogle Scholar
Raske, A. G. 1976. Complexities in the number of larval instars of the birch casebearer in Newfoundland (Lepidoptera: Coleophoridae). Can. Ent. 108: 401–405.CrossRefGoogle Scholar
Raske, A. G. and Bryant, D. G.. 1976. Distribution of overwintering birch casebearer larvae, Coleophora fuscedinella, on white birch (Lepidoptera: Coleophoridae). Can. Ent. 108: 407–414.CrossRefGoogle Scholar
Salman, K. A. 1929. Notes on immature stages and biology of a birch casebearer. Ann. ent. Soc. Am. 22: 480–488.CrossRefGoogle Scholar