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GUSTATORY CUES IN THE ORIENTATION OF DENDROCTONUS PONDEROSAE (COLEOPTERA: SCOLYTIDAE) TO HOST TREES1

Published online by Cambridge University Press:  31 May 2012

K. F. Raffa  and
A. A. Berryman
K. F. Raffa
Affiliation:
Department of Entomology, Washington State University, Pullman, Washington99164
A. A. Berryman
Affiliation:
Department of Entomology, Washington State University, Pullman, Washington99164
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Abstract

Female mountain pine beetles, Dendroctonus ponderosae Hopkins, were exposed to papers soaked in outer bark extracts of lodgepole pine, Pinus contorta Douglas var. latifolia Engelmann. Both benzene and methanol–water extracts elicited greater feeding activity than did controls. Non-polar host compounds exhibited greater incitant (initiation of feeding) properties, while polar compounds were more powerful stimulants (continuation of feeding). No differences were detected in feeding on extracts from resistant or susceptible trees. Repellency appears to be associated with beetle responses to active host metabolism.

Résumé

Des femelles du dendroctone du pin ponderosa, Dendroctonus ponderosae Hopkins, ont été mises en présence de papiers trempés dans des extraits d'écorce externe du pin Pinus contorta Douglas var. latifolia Engelmann. Des extraits au benzène ou au méthanol-eau ont tous deux suscité une activité d'alimentation accrue par rapport aux témoins. Les substances non-polaires de l'hôte se sont avérées plus incitantes (initiation de l'alimentation), alors que les composés polaires se sont révélés plus stimulants (continuation de l'alimentation). Aucune différence dans l'alimentation n'a été décelée entre des extraits d'arbres résistants et susceptibles. La répulsion semble être le fait d'une réponse de l'insecte au métabolisme fonctionnel de l'hôte.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 2 , February 1982 , pp. 97 - 104
Copyright
Copyright © Entomological Society of Canada 1982

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