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INFLUENCE OF DIET ON REPELLENT AND FEEDING-DETERRENT ACTIVITY OF LARVAL ORAL EXUDATE IN SPRUCE BUDWORMS (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

L.M. Poirier  and
J.H. Borden
L.M. Poirier*
Affiliation:
Department of Forest Sciences, Faculty of Forestry, University of British Columbia, 2424 Main Mall, Vancouver, British Columbia, Canada V6T 1Z4
J.H. Borden
Affiliation:
Department of Forest Sciences, Faculty of Forestry, University of British Columbia, 2424 Main Mall, Vancouver, British Columbia, Canada V6T 1Z4
*
1 Author to whom all corresponding should be addressed (E-mail: poirier@interchg.ubc.ca).
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Abstract

A two-choice feeding bioassay was used to investigate the effects of larval source (colony versus wild larvae) and rearing medium (artificial versus foliar diet) on the feeding-deterrent activity of the oral exudate of the spruce budworm and the western spruce budworm, Choristoneura fumiferana (Clem.) and Choristoneura occidentalis Free., respectively. Feeding by both wild and colony larvae was deterred by conspecific oral exudate. Larvae reared on artificial diet responded to exudate from both diet- and foliage-reared larvae, whereas the foliage-reared larvae responded only to exudate from other foliage-reared larvae. These results suggest that differences exist between artificial diet- and foliage-reared larvae in the composition of oral exudate, in the concentrations of its biologically active constituents, or in differential sensitivity of diet- and foliage-reared larvae to exudate from foliage-reared larvae.

Résumé

Une expérience d’alimentation à deux choix a servi à étudier les effets de la provenance des larves (colonie versus larves sauvages) et du milieu d’élevage (artificiel versus régime de feuilles) sur l’activité inhibitrice de l’alimentation des sécrétions orales de la Tordeuse des bourgeons de l’épinette, Choristoneura fumiferana (Clem.), et de la Tordeuse occidentale de l’épinette, Choristoneura occidentalis Free. L’alimentation a été inhibée par les sécrétions orales d’individus conspécifiques, aussi bien chez les larves de la colonie que chez les larves sauvages. Les larves nourries du régime artificiel ont réagi aux sécrétions des larves nourries aux deux régime, mais les larves nourries de feuillage n’ont réagi qu’aux sécrétions d’autres larves nourries de feuillage. Ces résultats indiquent qu’il existe des différences dans la nature des sécrétions orales des larves nourries à un régime artificiel et celles des larves nourries de feuillage et dans les concentrations des composantes biologiquement actives de ces sécrétions; il existe également des différences dans la sensibilité de deux types de larves aux sécrétions des larves nourries de feuillage.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 132 , Issue 1 , February 2000 , pp. 81 - 89
Copyright
Copyright © Entomological Society of Canada 2000

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