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POPULATION DENSITY AND DYNAMICS OF LARCH CASEBEARER (LEPIDOPTERA: COLEOPHORIDAE) IN THE BLUE MOUNTAINS OF OREGON AND WASHINGTON BEFORE THE BUILD-UP OF EXOTIC PARASITES

Published online by Cambridge University Press:  31 May 2012

R. B. Ryan
R. B. Ryan
Affiliation:
Forestry Sciences Laboratory, Pacific Northwest Forest and Range Experiment Station, U.S. Department of Agriculture, Forest Service, Corvallis, Oregon 97331
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Abstract

Population density and parasitism of larch casebearer, Coleophora laricella (Hübner), were monitored for 10 years before parasites introduced for biological control became abundant. Overwintering densities remained fairly stable at about 100 larvae per 100 buds. The factor most closely correlated with population change was something, as yet unknown, other than the native parasites, which tended to be inversely density-dependent. The data will serve as the “before” period in a before and after evaluation of the biological control program.

Résumé

La densité de population et le parasitisme du porte-case du mélèze, Coleophora laricella (Hübner), ont été recensés pendant 10 ans avant que des parasites introduits comme auxiliaires de lutte biologique ne soient devenus abondants. Les densités d'hivernement sont restées assez stables à environ 100 larves par 100 bourgeons. Le facteur le plus étroitement correlé avec les variations d'abondance est encore inconnu. Ce facteur est différent des parasites indigènes, qui sont inversement dépendant de la densité. Ces données serviront à couvrir la période “avant” d'une étude d'évaluation avant et après de ce programme de lutte biologique.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 9 , September 1983 , pp. 1095 - 1102
Copyright
Copyright © Entomological Society of Canada 1983

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