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FACTORS AFFECTING CATCH IN PHEROMONE TRAPS FOR MONITORING THE WESTERN SPRUCE BUDWORM, CHORISTONEURA OCCIDENTALIS FREEMAN

Published online by Cambridge University Press:  31 May 2012

J.D. Sweeney ,
J.A. McLean  and
R.F. Shepherd
J.D. Sweeney
Affiliation:
Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
J.A. McLean
Affiliation:
Faculty of Forestry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1W5
R.F. Shepherd
Affiliation:
Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
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Abstract

The effects of trap design, lure concentration, lure age, and trap maintenance on the catch of western spruce budworm moths, Choristoneura occidentalis Freeman, in pheromone traps were tested in light to moderate infestations near Ashcroft, B.C. High cumulative moth catches reduced the trapping efficiency of both the sticky traps and the non-sticky Uni-traps relative to traps from which the moths were removed every 2 days. Correlations between the total season’s catch and larval density per plot in the same and following generations were not significant (P>0.05) for any of the eight combinations of trap design, lure concentration, and maintenance regimen tested. However, by dividing the mean moth catch in Uni-traps by either the basal area or foliage biomass per hectare in each plot, correlations with the following year’s larval density were significant (r 2 = 0.77–0.98; P<0.05; n=5).

Résumé

L’influence du modèle de piège, de la concentration de l’amorce, de l’âge de l’amorce et de l’entretien du piège à la prise de la tordeuse occidentale de l’épinette, Choristoneura occidentalis Freeman, aux pièges ont été mis à l’épreuve à la lumière contre les infestations modérées près d’Ashcroft, Colombie-Britannique. Les prises cumulatives élevées ont réduit l’efficacité comme piège des pièges collants et les pièges Uni-traps non-collants, tous les deux, à comparer aux pièges où les adultes ont été enlevés à tous les 2 jours. Les corrélations entre la prise globale pour la saison et la densité larvaire par lot de terrain de la même génération et la génération suivante n’ont pas été significatives (P>0,05), dans le cas de n’importe des huit combinaisons de modèle de piège, concentration de l’amorce et régime d’entretien essayées. Cependant, en divisant le nombre moyen d’adultes pris par les pièges Uni-traps soit par la superficie de base, soit par la biomasse de feuillage par hectare de chaque lot de terrain, les corrélations avec la densité larvaire de l’année suivante ont été significatives (r 2 = 0,77–0,98; P<0,05; n=5).

Type
Research Article
Information
The Canadian Entomologist , Volume 122 , Issue 6 , December 1990 , pp. 1119 - 1130
Copyright
Copyright © Entomological Society of Canada 1990

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Footnotes

1

Present address: Forestry Canada — Maritimes, PO Box 4000, Fredericton, New Brunswick, Canada E3B 5P7.

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