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INCIDENCE OF PARASITOIDS ATTACKING ENDEMIC SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) POPULATIONS IN NEW BRUNSWICK

Published online by Cambridge University Press:  31 May 2012

C. A. Miller  and
T. R. Renault
C. A. Miller
Affiliation:
Canadian Forestry Service Maritimes Forest Research Centre, Fredericton, New Brunswick
T. R. Renault
Affiliation:
Canadian Forestry Service Maritimes Forest Research Centre, Fredericton, New Brunswick
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Abstract

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Annual population estimates of spruce budworm, Choristoneura fumiferana (Clem.), larvae and the incidence of larval parasitism were monitored in northern New Brunswick following the collapse of the 1949–1959 epidemic in the region. The most common parasitoid among the very sparse hosts was Synetaeris tenuifemur, although it had been rarely found during the epidemic. Larval parasitism sometimes exceeded 50% but it could not be shown as a key factor associated with changing host abundance.

Résumé

Dans le nord du Nouveau-Brunswick, après que l’épidémie de Tordeuses des bourgeons de l’Épinette eut fortement diminué, les auteurs suivirent de près la population annuelle des larves de la Tordeuse et le taux de parasitisme des mêmes larves. Le parasitoide le plus commun sur les hôtes devenus rares était Synetaeris tenuifemur, bien qu’auparavant, durant l’épidémie, on l’ait alors trouvé rarement comme parasite des larves. Parfois plus de 50% des larves étaient parasitées mais on ne put prouver qu’il s’agissait d’un facteur principal affectant l’abondance des hôtes.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 10 , October 1976 , pp. 1045 - 1052
Copyright
Copyright © Entomological Society of Canada 1976

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