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Polyurethane foam strips to estimate parasitism of hemlock looper (Lepidoptera: Geometridae) eggs by Telenomus spp. (Hymenoptera: Scelionidae)

Published online by Cambridge University Press:  02 April 2012

Christian Hébert ,
Richard Berthiaume  and
Clément Bordeleau
Christian Hébert*
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, 1055 du P.E.P.S., P.O. Box 3800, Sainte-Foy, Quebec, Canada G1V 4C7
Richard Berthiaume
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, 1055 du P.E.P.S., P.O. Box 3800, Sainte-Foy, Quebec, Canada G1V 4C7
Clément Bordeleau
Affiliation:
Ministère des Ressources naturelles et de la Faune du Québec, Direction de la conservation des forêts, 2700 rue Einstein, Sainte-Foy, Québec, Canada G1P 3W8
*
1Corresponding author (e-mail: chebert@nrcan.gc.ca).
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Abstract

An oviposition trap recently developed to survey hemlock looper (Lambdina fiscellaria (Guenée)) eggs and consisting of a small strip of white polyurethane foam stapled to the tree bole provides reliable estimates of Telenomus spp. parasitism on hemlock looper eggs. Oviposition traps are a standard tool that never varies. They allow us to avoid the tedious and expensive extraction process used when collecting eggs from branches. This new method can be implemented rapidly in a high number of plots and provides the egg parasitism estimates needed in spring to improve hemlock looper population management.

Résumé

Un gîte de ponte récemment développé pour surveiller les populations d'œufs de l'arpenteuse de la pruche (Lambdina fiscellaria (Guenée)) et fait d'une petite pièce de mousse de polyuréthane blanc fixée sur le tronc des arbres fourni des évaluations valables du parasitisme des œufs par Telenomus spp. Les gîtes de ponte sont un outil standard qui ne varie pas. Ils permettent d'éviter le recours au processus laborieux et coûteux d'extraction des œufs utilisé lorsqu'on récolte des branches. Cette nouvelle méthode peut être déployée rapidement dans un nombre élevé de sites pour fournir les évaluations printanières du parasitisme des œufs nécessaires pour améliorer la gestion des populations de l'arpenteuse de la pruche.

Type
Articles
Information
The Canadian Entomologist , Volume 138 , Issue 1: Adaptations and Constraints: a Symposium in Honour of Richard Ring / Adaptations et contraintes : un symposium en l'honneur de Richard Ring , February 2006 , pp. 114 - 117
Copyright
Copyright © Entomological Society of Canada 2006

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