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RELATION OF BIRCH CASEBEARER (LEPIDOPTERA: COLEOPHORIDAE) NUMBERS TO PER CENT DEFOLIATION OF WHITE BIRCH

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

Regression equations of per cent defoliation of white birch stands, Betula papyrifera Marsh., to birch casebearer, Coleophora fuscedinella Zeller, eggs or larvae had precisions (standard error of the estimate, b) of about 20% of the estimate. Although log-transformation of counts stabilized the variance, it did not increase the precision of the equations. Precision of regression estimates based on data from whole-stratum sample units differed little from that from only four mid-crown branches. The latter sample universe is smaller and more rapidly examined.

Type
Articles
Information
The Canadian Entomologist , Volume 109 , Issue 10 , October 1977 , pp. 1307 - 1312
Copyright
Copyright © Entomological Society of Canada 1977

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References

Brittain, W. H. and Grant, W. F.. 1967. Observations on Canadian birch (Betula) collections at the Morgan Arboretum. V. B. papyrifera and B. cordifolia from Eastern Canada. Can. Field-Nat. 81: 251–262.CrossRefGoogle Scholar
Bryant, D. G. and Clark, R. C.. 1975. Spruce budworm egg-mass sampling in Newfoundland. Environ. Can., Bi-mon. Res. Notes 31: 12.Google Scholar
Bryant, D. G. and Raske, A. G.. 1975. Defoliation of white birch by the birch casebearer, Coleophora fuscedinella (Lepidoptera: Coleophoridae). Can. Ent. 107: 217–223.CrossRefGoogle Scholar
Cochran, S. G. 1974 (unpub.). Biology and control of the birch casebearer in Newfoundland. M.Sc. Thesis, McGill University. 126 pp.Google Scholar
Morris, R. F. 1955. The development of sampling techniques for forest insect defoliators, with particular reference to spruce budworm. Can. J. Zool. 33: 225–294.CrossRefGoogle Scholar
Morris, R. F. (Ed.). 1963. The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31. 332 pp.Google Scholar
Li, J. C. R. 1964. Statistical inference I. Edwards Brothers, Ann Arbor, Mich.Google Scholar
Raske, A. G. 1973. Difference between two species of birch in attack and susceptibility to defoliation by the birch casebearer. Environ. Can., Bi-mon. Res. Notes 29: 17–18.Google Scholar
Raske, A. G. 1974. Mortality of birch casebearer eggs. Environ. Can., Bi-mon. Res. Notes 30: 1–2.Google Scholar
Raske, A. G. 1975 a. Foliage consumption by late instar birch casebearer larvae. Environ. Can., Bi-mon. Res. Notes 31: 9.Google Scholar
Raske, A. G. 1975 b. Mortality of overwintering birch casebearer larvae. Environ. Can., Bi-mon. Res. Notes 31: 9–10.Google 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
Raske, A. G. and Bryant, D. G.. 1977. Distribution, survival, and intra-tree movement of late-instar birch casebearer larvae on white birch (Lepidoptera: Coleophoridae). Can. Ent. 109: 1297–1306.CrossRefGoogle Scholar
Snedecor, G. W. 1956. Statistical methods, 2 ed. Iowa State Coll. Press.Google Scholar
Warren, W. G. 1971. Correlation or regression: bias or precision. J. Roy. Statist. Soc., Series C. (Applied statistics) 20: 148–164.Google Scholar