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FOLIAGE SUITABILITY OF SAPLINGS GROWN UNDER CONTRASTING WATER REGIMES TO THE GYPSY MOTH, LYMANTRIA DISPAR

Published online by Cambridge University Press:  31 May 2012

Robin Naidoo  and
Martin J. Lechowicz
Robin Naidoo*
Affiliation:
Department of Biology, McGill University, 1205 Dr. Penfield Avenue, Montréal, Quebec, Canada H3A 1B1
Martin J. Lechowicz
Affiliation:
Department of Biology, McGill University, 1205 Dr. Penfield Avenue, Montréal, Quebec, Canada H3A 1B1
*
1 Author to whom all correspondence should he sent at the following address: Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E9.
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Abstract

We assessed the robustness of a standard classification of foliage suitability of North American tree species to the gypsy moth (Lymantria dispar L.) for tree species of southern Quebec grown under contrasting water regimes. Dispersal trials for 1st-instar larvae and feeding trials for 4th-instar larvae were conducted to determine whether water regime and (or) maternal effects influenced the preference or avoidance of gypsy moth larvae for foliage from saplings of native tree species of Quebec. We found no effect of water regime on the suitability of foliage to 1st-instar larvae and no effect of water regime and maternal effects for 4th-instar larvae. The standard classification scheme used by U.S. Department of Agriculture researchers in the United States was generally robust to the above factors, and thus suitable for use in southern Quebec.

Résumé

Nous avons evalué, pour les espèces d’arbres au sud du Québec, la robustesse d’une système de classification au sujet de la préférence de la spongieuse (Lymantria dispar L.) pour des espèces d’arbres du Nord Amérique. Les effets de la disponibilité d’eau, ainsi que les effets maternelles ont été évaluées dans plusieurs expériences dans lesquelles des larves de la spongieuse étaient fournis avec des feuilles des jeunes arbres qui ont été soit irrigués ou bien non-irrigués. Les larves du premier niveau et du quatrième niveau ont été utilisés dans les experiences. Il n’y avait aucun effet d’irrigation ou d’effets maternelles sur la préférence des larves pour le feuillage. Le système de classification utilisé dans les Etats-Unis par les chercheurs a été généralement constant avec les préférences des larves pour les espèces Québécoises dans nos expériences.

Type
Articles
Information
The Canadian Entomologist , Volume 130 , Issue 6 , December 1998 , pp. 853 - 857
Copyright
Copyright © Entomological Society of Canada 1998

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