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A new standard pupation shelter for sampling pupae and estimating mortality of the hemlock looper (Lepidoptera: Geometridae)

Published online by Cambridge University Press:  02 April 2012

Christian Hébert ,
Luc Jobin ,
Richard Berthiaume ,
Jean-François Mouton ,
Alain Dupont  and
Clément Bordeleau
Christian Hébert*
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, 1055 du P.E.P.S., PO Box 3800, Sainte-Foy, Quebec, Canada G1V 4C7
Luc Jobin
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, 1055 du P.E.P.S., PO 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., PO Box 3800, Sainte-Foy, Quebec, Canada G1V 4C7
Jean-François Mouton
Affiliation:
CLC-Camint Inc, 227 boulevard St-Joseph (2e étage), Gatineau (secteur Hull), Québec, Canada J8Y 3X5
Alain Dupont
Affiliation:
Société de protection des forêts contre les insectes et maladies, 1780 Semple, Québec, Québec, Canada G1N 4B8
Clément Bordeleau
Affiliation:
Ministère des Ressources naturelles, de la Faune et des Parcs, Direction de la conservation, Complexe scientifique, 2700 Einstein, Sainte-Foy, Québec, Canada G1P 3W8
*
1Corresponding author (e-mail: Christian.hebert@nrcan.gc.ca).
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Abstract

A new standard pupation shelter for sampling hemlock looper (Lambdina fiscellaria) pupae is described and compared with the burlap band method developed by Otvos (1974; The Canadian Entomologist106: 329–31). The new pupation shelter is placed on the bole, at breast height or in the crown, to estimate population abundance and mortality. The utilization of two shelters at breast height was as efficient as the use of burlap bands to estimate hemlock looper abundance and more efficient for sampling braconid cocoons. It provided reliable estimates of braconid and tachinid parasitism but overestimated that by ichneumonids. This new pupation shelter is an inexpensive tool that can be used easily by nonspecialized personnel, thus allowing increases in the number of sample plots, which is necessary to improve detection of outbreaks of the hemlock looper. This new shelter could be used to sample other lepidopterans whose late-instar larvae aggregate in concealed pupation sites.

Résumé

Un nouveau gîte de nymphose standard pour échantillonner les chrysalides de l'arpenteuse de la pruche (Lambdina fiscellaria) est décrit et comparé avec la méthode des bandes de jute développée par Otvos (1974; The Canadian Entomologist106: 329–31). Le nouveau gîte de nymphose est placé sur le tronc, à hauteur de poitrine ou dans la cime, pour estimer l'abondance et la mortalité des populations. L'utilisation de deux gîtes de nymphose à hauteur de poitrine est aussi efficace que les bandes de jute pour estimer l'abondance de l'arpenteuse de la pruche et plus efficace pour échantillonner les cocons de braconidae. Il procure des estimations fiables du parasitisme par les braconidae et les tachinidae mais surestime celui fait par les ichneumonidae. Ce nouveau gîte de nymphose est un outil peu coûteux qui peut être utilisé par du personnel non-spécialisé, permettant ainsi d'augmenter le nombre de parcelles d'échantillonnage nécessaires afin d'améliorer la détection des épidémies de l'arpenteuse de la pruche. Ce nouveau gîte de nymphose pourrait être utilisé pour échantillonner d'autres Lépidoptères dont les larves âgées se rassemblent dans des sites de pupaison leur permettant de se dissimuler.

Type
Articles
Information
The Canadian Entomologist , Volume 136 , Issue 6 , December 2004 , pp. 879 - 887
Copyright
Copyright © Entomological Society of Canada 2004

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