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FEEDING RESPONSES OF THE WHITE PINE WEEVIL, PISSODES STROBI (PECK) (COLEOPTERA: CURCULIONIDAE), IN RELATION TO HOST RESISTANCE IN BRITISH COLUMBIA

Published online by Cambridge University Press:  31 May 2012

Elizabeth S. Tomlin
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
John H. Borden
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6

Abstract

Feeding preferences of the white pine weevil, Pissodes strobi (Peck), for resistant or susceptible Sitka spruce, Picea sitchensis (Bong) Carr., were investigated using three types of laboratory bioassay. In paired-twig bioassays, fall weevils were significantly deterred from feeding up to 80% by resistant clones from four British Columbia provenances: Green Timbers, Cedarvale, Haney, and Big Qualicum. Females showed greater discrimination than males. Spring weevils were deterred from feeding by clones from the Green Timbers and Big Qualicum provenances by up to 60%. Fall males were more consistently deterred than spring males, suggesting that some host selection occurs in the fall. Females were significantly deterred from ovipositing on twigs from one clone from Big Qualicum, and stimulated by clones from Cedarvale when given a choice. Given no choice, however, they were significantly deterred from ovipositing, but not feeding by several resistant clones. In agar-disc bioassays, spring weevils were significantly deterred from feeding by bark from the provenances of Cedarvale and Big Qualicum by up to 86%. Trees from the provenances of Big Qualicum and Green Timbers caused the most consistent feeding or oviposition deterrency and may rely on this in part as a resistance mechanism. Because not all resistant clones and provenances were deterrent, we hypothesize that these trees may employ other resistance mechanisms which could be incorporated along with feeding and oviposition deterrency into breeding for resistance.

Résumé

Les préférences alimentaires du Charançon du pin blanc, Pissodes strobi (Peck), pour les épinettes de Sitka, Picea sitchensis (Bong) Carr., résistantes ou sensibles ont été déterminées au cours de trois types d’expériences en laboratoire. Au cours d’expériences où les rameaux étaient pairés, les charançons d’automne ont réagi en réduisant considérablement leur alimentation, jusqu’à 80%, en présence de clones résistants de quatre provenances en Colombie-Britannique, Green Timbers, Cedarvale, Haney et Big Qualicum. Les femelles étaient encore plus sélectives que les mâles. Au printemps, les charançons ont réduit leur alimentation, jusqu’à 60%, en présence de clones de Green Timbers et de Big Qualicum. Les mâles d’automne étaient toujours plus inhibés que les mâles de printemps, ce qui indique qu’il se fait un certain degré de sélection de l’hôte à l’automne. En présence d’un choix, les femelles s’abstenaient de pondre leurs oeufs sur des rameaux d’un clone de Big Qualicum et étaient stimulées à pondre par des clones de Cedarvale. Lorsqu’elles n’avaient pas le choix cependant, le comportement de ponte de ces femelles, mais pas leur alimentation, était significativement inhibé par plusieurs clones résistants. Dans les expériences sur disques d’agar, l’alimentation des charançons de printemps était significativement inhibée, jusqu’à 86%, en présence d’écorces provenant de Cedarvale et de Big Qualicum. Les arbres en provenance de Big Qualicum et de Green Timbers sont ceux qui ont inhibé le plus l’alimentation et la ponte des charançons et il est possible que ces propriétés inhibitrices fassent partie de leurs mécanismes de résistance. Cependant, comme les clones résistants et les arbres des diverses provenances n’ont pas tous des propriétés inhibitrices, nous croyons que les arbres utilisent d’autres mécanismes de résistance qui, combinés à l’inhibition de la ponte et de l’alimentation, pourraient contribuer à la sélection de la résistance chez ces arbres.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1996

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