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The Role of Introduced Parasites in the Control of the Winter Moth in Nova Scotia

Published online by Cambridge University Press:  31 May 2012

D. G. Embree
D. G. Embree
Affiliation:
Forest Research Laboratory, Department of Forestry of Canada, Fredericton, New Brunswick
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Abstract

The history of the winter moth, Operophtera brumata (Linnaeus), a geometrid introduced into Nova Scotia, is reviewed and an assessment is made of two introduced parasites: a tachinid, Cyzenis albicans (Fallen), and an ichneumonid, Agrypon flaveolatum (Gravenhorst). Functional response curves of both species are discussed, particularly the atypical S-shaped curve of C. albicans, which demonstrates regulatory properties. Biological control efforts to date have been successful but a virus that appeared in winter moth populations may change initial relationships between the introduced parasites and the host.

Résumé

Le cycle évolutif de l'arpenteuse tardive, Operophtera brumata Linné, introduite en Nouvelle-Écosse, fait le sujet d’une revue. Deux de ses parasites sont évalués. Il s’agit de Cyzenis albicans Fallen (Tachinidées), et d’Agrypon flaveolatum Gravenhorst (Ichneumonidées). L’auteur étudie les courbes de réaction fonctionnelle pour ces deux espèces-ci. Il fait surtout cas de celle, atypique et de figure en S, de C. albicans d’où ressortent certaines propriétés régulatoires. On a jusqu’à ce jour contenu toute prolifération de ces insectes mais une récente infestation des arpenteuses tardives par un virus peut déranger l'ordre établi.

Type
Articles
Information
The Canadian Entomologist , Volume 98 , Issue 11 , November 1966 , pp. 1159 - 1168
Copyright
Copyright © Entomological Society of Canada 1966

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