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INTERACTION BETWEEN SITKA SPRUCE WEEVIL AND ITS HOST, PICEA SITCHENSIS (BONG) CARR.: A NEW MECHANISM FOR RESISTANCE

Published online by Cambridge University Press:  31 May 2012

T.S. Sahota
Affiliation:
Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
J.F. Manville
Affiliation:
Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
E. White
Affiliation:
Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5

Abstract

Available information on the interaction between Sitka spruce weevil, Pissodes strobi (Peck), and its host Sitka spruce, Picea sitchensis (Bong) Carr., is examined. Based on a theoretical consideration of this information, a new mechanism is proposed to explain the resistance exhibited by some of the genetically distinct individuals of some provenances of this species. Experimental evidence is presented to show that resistant trees can sufficiently affect P. strobi reproduction and progeny development and survival to reduce this pest’s ability to kill the leaders of these trees when challenged with weevils containing already mature eggs. Our mechanism also provides an explanation as to how weevils are able to avoid attacking and reproducing on resistant trees in which their progeny would fail.

Résumé

Les informations disponibles sur l’interaction entre le charançon Pissodes strobi (Peck) et son hôte, l’Épinette de Sitka, Picea sitchensis (Bong) Carr., ont été étudiées. Des considérations théoriques sur ces informations ont donné lieu à une hypothèse sur le mécanisme capable d’expliquer la résistance qui prévaut chez certains arbres génétiquement distincts, d’origines particulières. Des preuves expérimentales permettent de démontrer que des arbres résistants peuvent affecter suffisamment la reproduction de P. strobi, de même que le développement et la survie des rejetons, pour réduire la capacité des parasites de tuer les plus forts de ces arbres lorsque ceux-ci sont envahis par des charançons contenant déjà des oeufs à maturité. Le mécanisme invoqué peut également expliquer comment les charançons peuvent éviter de se reproduire dans des arbres résistants où leur progéniture ne réussirait pas à survivre.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1994

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