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DOSE-DEPENDENT AND SPECIES-SPECIFIC RESPONSES OF PINE BARK BEETLES (COLEOPTERA: SCOLYTIDAE) TO MONOTERPENES IN ASSOCIATION WITH PHEROMONES

Published online by Cambridge University Press:  31 May 2012

Daniel R. Miller*
Affiliation:
Centre for Environmental Biology, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
John H. Borden
Affiliation:
Centre for Environmental Biology, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
*
1 Author to whom all correspondence should be sent at the following address: Forestry Sciences Laboratory, Southern Research Station, USDA Forest Service, 320 Green Street, Athens, Georgia 30602-2044, United States (E-mail: dmiller/srs-athens@fs.fed.us).

Abstract

Monoterpenes affected the attraction of three sympatric species of bark beetles (Coleoptera: Scolytidae) to pheromone-baited multiple-funnel traps in stands of lodgepole pine. Catches of Ips pini (Say) in traps baited with its pheromone, ipsdienol, were directly related to the release rates of 3-carene, β-phellandrene, and β-pinene. Catches of Dendroctonus ponderosae Hopkins in traps baited with exo-brevicomin and cis- and trans-verbenol were directly related to the release rates of 3-carene, myrcene, and β-phellandrene. Ips latidens (LeConte) exhibited preferences for traps baited with ipsenol and β-phellandrene or β-pinene but not in a dose-dependent fashion. Catches of I. latidens in traps baited with its pheromone, ipsenol, were inversely proportional to the release rates of 3-carene, myrcene, and terpinolene. Similarly, catches of I. pini in traps baited with its pheromone, ipsdienol, were inversely proportional to the release rates of myrcene and terpinolene. These results demonstrate a degree of species specificity among three phloeophagous species with respect to preferred host odours. The bark beetle predators–associates Lasconotus complex LeConte (Coleoptera: Colydiidae) and Corticeus Piller and Mitterpacher sp. (Coleoptera: Tenebrionidae) demonstrated some measure of specificity to monoterpenes in their responses to ipsdienol-baited funnel traps. γ-Terpinene increased attraction of L. complex but had no effect on Corticeus sp., whereas α- and β-pinene increased attraction of Corticeus sp. but had no effect on L. complex.

Résumé

La présence de monoterpènes a modifié l’attirance de pièges à entonnoirs multiples garnis de phéromones pour trois espèces sympatriques de scolytes des pins (Coleoptera : Scolytidae) dans une forêt de pins à feuilles tordues. Les récoltes d’Ips pini (Say) dans les pièges garnis de la phéromone même de l’insecte, l’ipsdienol, étaient reliées directement aux taux de libération de 3-carène, de β-pheilandrène et de β-pinène. Les récoltes de Dendroctonus ponderosae Hopkins dans les pièges garnis d’exo-brévicomine et de cis- et trans-verbenol étaient en corrélation avec les taux de libération de 3-carène, de myrcène et de β-pheilandrène. Ips latidens (LeConte) a manifesté une préférence pour les pièges garnis d’ipsénol et de β-pheilandrène ou β-pinène, mais indépendamment de la dose. Les récoltes d’I. latidens dans les pièges garnis de la phéromone de cet insecte, l’ipsénol, se sont avérées inversement proportionnelles aux taux de libération de 3-carène, de myrcène et de terpinolène. De même, les captures d’I. pini dans les pièges garnis de sa phéromone, l’ipsdiénol, étaient inversement proportionnelles aux taux de libération de myrcène et de terpinolene. Ces résultats démontrent l’existence d’une certaine spécificité chez chacune de ces trois espèces phloéophages quant aux odeurs d’hôtes qu’elles préfèrent. Les prédateurs/associés des scolytes Lasconotus complex LeConte (Coleoptera : Colydiidae) et Corticeus Piller et Mitterpacher sp. (Coleoptera : Tenebrionidae) ont démontré un certain degré de spécificité aux monoterpènes dans leurs réactions aux pièges à entonnoirs garnis d’ipsdiénol. L’γ-terpinène a augmenté l’attirance des pièges pour L. complex mais n’a pas eu d’effet sur Corticeus sp., alors que l’α-pinène et la β-pinène ont augmenté l’attirance des pièges pour Corticeus sp., mais pas pour L. complex.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 2000

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