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Effect of artificial diet components on conspecific repellency of larval oral secretions from western spruce budworm (Lepidoptera: Tortricidae)

Published online by Cambridge University Press:  03 January 2012

L.M. Poirier  and
J.H. Borden
L.M. Poirier*
Affiliation:
Ecosystem Science and Management Program, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia, Canada V2N 4Z9
J.H. Borden
Affiliation:
Contech Enterprises Inc., 7572 Progress Way, Delta, British Columbia, Canada V4G 1E9
*
1Corresponding author (e-mail: poirierl@unbc.ca).
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Abstract

A choice feeding bioassay was used to investigate the effects of artificial diet components on the repellency of larval oral secretions from western spruce budworm, Choristoneura occidentalis Freeman, to conspecific larvae. Oral secretions from insects fed on agar supplemented with linseed oil were as repellent as secretions from insects fed on complete artificial diet. Secretions from insects fed on agar alone, agar and casein, or agar and wheat germ were not significantly more repellent than distilled water; neither was linseed oil alone. Linseed oil consists of glycerides of several fatty acids, which are likely metabolized quickly in the insect gut; repellency of oral secretions could be due to any of the related fatty acids or metabolites.

Résumé

Un test biologique de choix de nourriture nous a servi à déterminer les effets des composantes de régimes artificiels sur le caractère répulsif des sécrétions orales des larves de la tordeuse occidentale de l'épinette, Choristoneura occidentalis Freeman, pour les larves de même espèce. La sécrétion orale d'insectes nourris d'agar-agar enrichi d'huile de lin est aussi répulsive que la sécrétion d'insectes alimentés d'un régime artificiel complet. Les sécrétions des insectes nourris seulement d'agar-agar, d'agar-agar et de caséine ou d'agar-agar et de germe de blé ne sont pas significativement plus répulsives que l'eau distillée; il en est de même de celles de larves alimentées d'huile de lin seule. L'huile de lin est composée des glycérides de plusieurs acides gras, qui sont vraisemblablement métabolisés rapidement dans le tube digestif des insectes; le caractère répulsif des sécrétions orales pourrait être dû à n'importe quel des acides gras concernés ou de leurs métabolites.

[Traduit par la Rédaction]

Type
Behavior & Ecology
Information
The Canadian Entomologist , Volume 143 , Issue 4 , August 2011 , pp. 384 - 387
Copyright
Copyright © Entomological Society of Canada 2011

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