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RESISTANCE AGAINST WHITE PINE WEEVIL: EFFECTS ON WEEVIL REPRODUCTION AND HOST FINDING

Published online by Cambridge University Press:  31 May 2012

T.S. Sahota ,
J.F. Manville ,
F.G. Peet ,
E.E. White ,
A.I. Ibaraki  and
J.R. Nault
T.S. Sahota
Affiliation:
Pacific Forestry Centre, Canadian Forestry Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada, V8Z 1M5
J.F. Manville
Affiliation:
Pacific Forestry Centre, Canadian Forestry Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada, V8Z 1M5
F.G. Peet
Affiliation:
Pacific Forestry Centre, Canadian Forestry Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada, V8Z 1M5
E.E. White
Affiliation:
Pacific Forestry Centre, Canadian Forestry Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada, V8Z 1M5
A.I. Ibaraki
Affiliation:
Pacific Forestry Centre, Canadian Forestry Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada, V8Z 1M5
J.R. Nault
Affiliation:
Pacific Forestry Centre, Canadian Forestry Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada, V8Z 1M5
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Abstract

Feeding on leaders of resistant Sitka spruce trees, Picea sitchensis (Bong.) Carr., Led to ovarian regression in white pine weevils, Pissodes strobi Peck., that contained already mature eggs at the time of caging on leaders. Such feeding also led to inhibition or a virtual blockage of ovarian development in weevils that did not contain already mature eggs at the time of caging. Ovarian maturation in such weevils was restored by application of juvenile hormone to female weevils. Effects of three levels of resistance were consistent within the experiments and with the field performance of the tested clones. These results indicate that the effects of resistance were postingestive, i.e., resistance was a form of antibiosis. How antibiosis can cause the weevils to concentrate oviposition on susceptible trees is discussed. Results also provide a means of selecting and ranking resistance of individual spruce trees for tree breeding and reforestation.

Résumé

La consommation de bourgeons terminaux d’une variété résistante d’épinette de Sitka, Picea sitchensis (Bong.) Carr., a entraîné la régression des ovaires chez des Charançons du pin blanc qui contenaient déjà des oeufs à maturité au moment du piégeage dans les bourgeons. Ce type d’alimentation a également entraîné l’inhibition ou le blocage virtuel du développement ovarien chez les charançons qui ne contenaient pas déjà des oeufs à maturité au moment de leur capture. La maturation ovarienne a repris son cours à l’administration d’hormone juvénile aux femelles. Les effets de trois degrés de résistance se sont avérés toujours les mêmes au cours des expériences et pouvaient expliquer la performance des clones testés sur le terrain. Ces résultats indiquent que les effets de la résistance se manifestent après l’ingestion, et que la résistance est donc une forme d’antibiose. Comment l’antibiose peut pousser les charançons à concentrer leurs efforts de ponte sur les arbres sensibles reste à déterminer, ce qui fait l’objet d’une discussion. Les résultats fournissent des informations sur la façon de choisir et d’évaluer les épinettes en fonction de leur résistance dans le but de les cultiver et de s’en servir dans les programmes de récupération des forêts.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 130 , Issue 3 , June 1998 , pp. 337 - 347
Copyright
Copyright © Entomological Society of Canada 1998

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