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ASSESSING NATURAL SELECTION IN WHITE PINE WEEVILS (PISSODES STROBI PECK) (COLEOPTERA: CURCULIONIDAE) FOR OVERCOMING RESISTANCE IN TREES: AN EVOLUTIONARY MODEL

Published online by Cambridge University Press:  31 May 2012

Hugh J. Barclay
Affiliation:
Pacific Forestry Centre, 506 West Burnside Rd., Victoria, British Columbia, Canada V8Z 1M5, andDepartment of Biology, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2

Abstract

An evolutionary model was constructed for the white pine weevil (Pissodes strobi Peck). This weevil attacks Sitka spruce [Picea sitchensis (Bongard) Carriere], and Sitka spruce trees have two forms, one being susceptible to the insect attacks and the other being resistant to attack. There is a fear that insects may develop tolerance to the resistant trees. The strategy of interplanting susceptible and resistant trees to minimize the likelihood of the insects developing tolerance mechanisms to circumvent the resistance is examined. It is found that if only one gene locus is involved, the development of tolerance occurs more quickly than if resistance is governed by two independent loci. The rate of evolution of tolerance to tree resistance is retarded by increased adult survivorship, the degree of recessiveness of the gene, preferential attack of susceptible trees, redistribution of intolerant insects from resistant to susceptible trees, and the immigration of wild-type insects.

Résumé

Un modèle évolutif a été élaboré pour étudier la tolérance chez le Charançon du pin blanc (Pissodes strobi Peck). Ce charançon attaque l’épinette de Sitka (Picea sitchensis (Bongard) Carrière), arbre qui compte deux formes, l’une sensible et l’autre résistante aux attaques des insectes. Il est à craindre que les insectes ne développent une tolérance aux arbres résistants. La stratégie qui consiste à planter des arbres sensibles et des arbres résistants en alternance pour minimiser la probabilité que l’insecte ne génère des mécanismes de tolérance pour vaincre la résistance des arbres est examinée. Il semble que, lorque la résistance ne dépend que d’un locus, la tolérance apparaît plus rapidement que si la résistance est contrôlée par deux locus indépendants. La vitesse d’évolution de la tolérance à la résistance des arbres est retardée par une augmentation de la survie des adultes, par le degré de récessivité du gène, par les attaques préférentielles d’arbres sensibles, par tranfert des insectes intolérants d’arbres résistants à des arbres sensibles et par immigration d’insectes de type sauvage.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1997

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