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Biology of the spiny ash sawfly, Eupareophora parca (Hymenoptera: Tenthredinidae: Blennocampinae), in Edmonton, Alberta

Published online by Cambridge University Press:  02 April 2012

Daryl J. Williams
Daryl J. Williams
Affiliation:
Natural Resources Canada, Canadian Forest Service, Northern Forestry Centre, 5320 122 Street, Edmonton, Alberta, Canada T6H 3S5 (e-mail: dawillia@nrcan.gc.ca
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Abstract

The spiny ash sawfly, Eupareophora parca (Cresson, 1880), was discovered in Edmonton in 2003 at the Northern Forestry Centre defoliating planted ash trees (Fraxinus spp.). This represents the first record of this species from Alberta. Observations of adult and larval behaviour and life-history variables such as adult flight, number and duration of larval instars, and overwintering were made. The nature and severity of defoliation was monitored in 2003 and 2004, and large increases were detected in the amount of defoliation per site and the number of sites defoliated between years. The precipitous increase in severity and extent of defoliation indicates the possibility that this species could become a significant urban pest in the province.

Résumé

La tenthrède épineuse du frêne, Eupareophora parca (Cresson, 1880), a été observée pour la première fois à Edmonton en 2003 au Northern Forestry Centre en train de défolier des frênes (Fraxinus spp.) cultivés. C'est la première mention de cette espèce en Alberta. Cette découverte a permis d'observer le comportement des adultes et des larves et de déterminer certaines variables du cycle biologique, telles que le vol des adultes, le nombre et la durée des stades larvaires et la survie à l'hiver. La nature et l'importance de la défoliation observées en 2003 et 2004 montrent une augmentation importante d'une année à l'autre de la défoliation à chacun des sites et du nombre de sites soumis à la défoliation. La croissance rapide de la sévérité et de l'étendue de la défoliation indique de l'espèce pourrait éventuellement devenir un ravageur urbain d'importance dans la province.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 139 , Issue 2 , April 2007 , pp. 269 - 277
Copyright
Copyright © Entomological Society of Canada 2007

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