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INTRODUCTION, PERMANENT ESTABLISHMENT, AND DISPERSAL IN EASTERN CANADA OF OLESICAMPE GENICULATAE QUEDNAU AND LIM (HYMENOPTERA: ICHNEUMONIDAE), AN IMPORTANT BIOLOGICAL CONTROL AGENT OF THE MOUNTAIN ASH SAWFLY, PRISTIPHORA GENICULATA (HARTIG) (HYMENOPTERA: TENTHREDINIDAE)

Published online by Cambridge University Press:  31 May 2012

F.W. Quednau
F.W. Quednau
Affiliation:
Forestry Canada, Quebec Region, 1055 du P.E.P.S., Sainte-Foy, Quebec, Canada G1V 4C7
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Abstract

From 1976 to 1978, 1300 mated females of Olesicampe geniculatae Quednau and Lim were released near Quebec City during a severe infestation of the mountain ash sawfly, Pristiphora geniculata (Hartig). Both cage and open releases were made. The interactions among the mountain ash sawfly, the imported primary parasite O. geniculatae, and the indigenous hyperparasite Mesochorus globulator (Thunb.), and the effect of O. geniculatae on the host population during and after the establishment phase, are reported. In 1984, O. geniculatae was recovered from all over southern Quebec. Parasitism ranged from 6 to 94%. Concurrently, infestation levels by the mountain ash sawfly declined significantly, and since 1985, the insect has almost disappeared in Quebec. With an annual spread of about 50 km per year after successful establishment, O. geniculatae now covers an area 1000 km in diameter. No major infestation by the mountain ash sawfly has been recorded in Quebec during the past 7 years. The introduction of O. geniculatae is rated as a complete success in classical biological control.

Résumé

Entre 1976 et 1978, 1300 femelles accouplées d’Olesicampe geniculatae Quednau et Lim ont été relâchées près de la ville de Québec pendant une infestation grave de la tenthrède du sorbier, Pristiphora geniculata (Hartig). Les parasites ont été relâchés et dans les enceintes et dans les champs. Les interactions entre la tenthrède du sorbier, le parasite primaire importé, O. geniculatae, et l’hyperparasite indigène, Mesochorus globulator (Thunb.), sont présentées, aussi bien que l’effet initial d’O. geniculatae contre la population hôte et suivant la phase d’établissement. En 1984, O. geniculatae a été recueilli partout dans le sud de la province de Québec. Le parasitisme a varié entre 6 et 94%. Simultanément, les taux d’infestation de la tenthrède du sorbier ont diminué significativement et depuis 1985 l’insecte est presque disparu au Québec. Ayant un taux de dispersion annuel de 50 km, suivant l’établissement, O. geniculatae occupe maintenant une étendue de 1000 km en diamètre. Aucune infestation majeure de la tenthrède du sorbier n’a été observée au Québec pendant les 7 dernières années. L’introduction d’O. geniculatae est alors jugée une réussite complète en lutte biologique classique.

Type
Articles
Information
The Canadian Entomologist , Volume 122 , Issue 5 , October 1990 , pp. 921 - 934
Copyright
Copyright © Entomological Society of Canada 1990

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