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ENHANCED WOODPECKER PREDATION ON THE MOUNTAIN PINE BEETLE, DENDROCTONUS PONDEROSAE HOPK., IN GLYPHOSATE-TREATED LODGEPOLE PINES

Published online by Cambridge University Press:  31 May 2012

David J. Bergvinson  and
John H. Borden
David J. Bergvinson
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, CanadaV5A 1S6
John H. Borden
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, CanadaV5A 1S6
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Abstract

Lodgepole pines, Pinus contorta var. latifolia Engelm., treated with the herbicide glyphosate applied by axe frill or drill hole into the sapwood around the root collar, were readily infested by mountain pine beetles, Dendroctonus ponderosae Hopk. On trees treated with 360 mg of glyphosate per centimetre of circumference, foraging woodpeckers, Picoides spp., debarked 15% of the bole surface within 10 weeks and > 30% after 1 year, compared with < 5% for controls. Foraging efficiency on mountain pine beetle at 4 m exceeded 90% after applications by axe frill of glyphosate at doses of 360, 36, and 3.6 mg per centimetre of circumference, compared with < 50% for controls. Glyphosate-treated trees rapidly became suitable for cavity excavation by woodpeckers.

Résumé

L’aubier du pin vrille, Pinus contorta var. latifolia Engelm., traité avec l’herbicide glyphosate appliqué ècorcer au dans des trous percés autour de la base du tronc, a été infesté par le dendroctone du pin ponderosa Dendroctonus ponderosae Hopk. Sur les arbres traités avec 360 mg de glyphosate par centimètre de circonférence, les pics Picoides spp. ont écorcé 15% de la surface du tronc en moins de 10 semaines et plus de 30% après 1 an, comparativement à moins de 5% pour les arbres contrôles. L’efficacité de forage des pics sur dendroctone du pin ponderosa à 4 m dépassait 90% après application écorcer de glyphosate à des doses de 360, 36 et 3.6 mg par centimètre de circonférence, compartivement à moins de 50% pour les arbres contrôles. Les arbres traités au glyphosate se sont avérés rapidement favorables au creusage de trous par les pics.

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 1 , February 1992 , pp. 159 - 165
Copyright
Copyright © Entomological Society of Canada 1992

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