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RELATING WEATHER TO OUTBREAKS OF WESTERN SPRUCE BUDWORM, CHORISTONEURA OCCIDENTALIS (LEPIDOPTERA: TORTRICIDAE), IN BRITISH COLUMBIA

Published online by Cambridge University Press:  31 May 2012

A. J. Thomson ,
R. F. Shepherd ,
J. W. E. Harris  and
R. H. Silversides
A. J. Thomson
Affiliation:
Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia V8Z 1M5
R. F. Shepherd
Affiliation:
Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia V8Z 1M5
J. W. E. Harris
Affiliation:
Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia V8Z 1M5
R. H. Silversides
Affiliation:
Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia V8Z 1M5
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Abstract

The relationship of western spruce budworm outbreaks and population collapse to weather parameters was examined using long term weather records from two stations in the budworm outbreak area of British Columbia and outbreak patterns obtained from Forest Insect and Disease Survey records and from tree stem analyses.

Outbreaks were associated with warm dry summers in conjunction with synchrony of larval emergence and bud flush. Collapse of the last two outbreaks was clearly associated with extreme high temperatures following moth flight. Collapse of the earlier outbreaks may have been due to asynchrony between larval emergence and bud flush.

Résumé

Les auteurs ont étudié le rapport entre des paramètres météorologiques et les pullulations et effondrements des populations de la tordeuse occidentale de l'épinette. Ils ont utilisé pour leur analyse les données météorologiques enregistrées sur une longue période par deux stations situées dans la zone d'infestations en Colombie-Britannique et les données sur les caractéristiques des infestations obtenues des relevés des insectes et des maladies des arbres et des analyses de la tige.

Ils ont trouvé que les pullulations étaient reliées à des étés secs associés au synchronisme de l'apparition des larves et de la sortie des bourgeons. L'effondrement des deux dernières pullulations est nettement associable à des températures élevées extrêmes après l'envol des papillons. La non-coïncidence de l'émergence des larves et de la sortie des bourgeons a pu causer l'effondrement des pullulations antérieures.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 3 , March 1984 , pp. 375 - 381
Copyright
Copyright © Entomological Society of Canada 1984

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