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EFFECT OF HOST AND NONHOST TREES ON THE GROWTH AND DEVELOPMENT OF THE FOREST TENT CATERPILLAR, MALACOSOMA DISSTRIA (LEPIDOPTERA: LASIOCAMPIDAE)

Published online by Cambridge University Press:  31 May 2012

R.W. Nicol ,
J.T. Arnason ,
B. Helson  and
M.M. Abou-Zaid
R.W. Nicol
Affiliation:
Department of Biology, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5
J.T. Arnason
Affiliation:
Department of Biology, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5
B. Helson*
Affiliation:
Canadian Forest Service, Natural Resources Canada, 1219 Queen St., Sault Ste. Marie, Ontario, Canada P6A 5M7
M.M. Abou-Zaid
Affiliation:
Canadian Forest Service, Natural Resources Canada, 1219 Queen St., Sault Ste. Marie, Ontario, Canada P6A 5M7
*
1Author to whom all correspondence should be addressed.
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Abstract

Larval growth and pupal parameters of the forest tent caterpillar (Malacosoma disstria Hübner) reared on the foliage of two host trees (Populus tremuloides Michx. and Acer saccharum Marsh.) and one nonhost tree (Acer rubrum L.) were quantified. This was achieved by undertaking a larval development bioassay under controlled laboratory conditions, but using fresh leaves collected in two field seasons. Larvae fed foliage of P. tremuloides grew exponentially and began to pupate after 3 weeks. Larvae fed with A. saccharum gained significantly less weight and had a reduced number of larvae pupate, and the pupae weighed significantly less than their counterparts fed on P. tremuloides. All larvae that were fed the foliage of A. rubrum died within 2 weeks. A nutritional utilization bioassay with fourth-instar larvae revealed that the foliage of A. saccharum has a growth-inhibitory component, whereas that of A. rubrum is antifeedant. Reasons are discussed for the discrepancy between the many reports of A. saccharum being a food host for M. disstria in the field and the laboratory results.

Résumé

La croissance larvaire et les caractéristiques de la chrysalide ont été quantifiées chez des Livrées des forêts (Malacosoma disstria Hübner) en élevage sur le feuillage de deux arbres hôtes (Populus tremuloides Michx. et Acer saccharum Marsh.) et un arbre non hôte (Acer rubrum L.). Les chenilles ont été observées en laboratoire dans des conditions contrôlées et elles étaient nourries de feuilles fraîches cueillies au cours de deux saisons de croissance. Les chenilles nourries de feuilles de P. tremuloides ont subi une croissance exponentielle et ont commencé leur nymphose après 3 semaines. Chez les chenilles nourries du feuillage d’A. saccharum, les gains de masse ont été significativement moins importants, un moins grand nombre d’entre elles sont parvenues à la nymphose et les chrysalides obtenues avaient une masse significativement moins élevée que celles du groupe précédent. Toutes les chenilles nourries de feuilles d’A. rubrum sont mortes en moins de 2 semaines. Une expérience sur l’alimentation des larves de quatrième stade a démontré que le feuillage d’A. sacharrum contient une substance inhibitrice de la croissance et que le feuillage d’A. rubrum inhibe l’alimentation. Les contradictions entre les différentes études sur les propriétés d’A. saccharum comme hôte de M. disstria en nature et en laboratoire sont analysées.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 6 , December 1997 , pp. 991 - 999
Copyright
Copyright © Entomological Society of Canada 1997

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