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Disruption of red turpentine beetle attraction to baited traps by the addition of California fivespined ips pheromone components

Published online by Cambridge University Press:  02 April 2012

Christopher J. Fettig ,
Robert R. Borys ,
Christopher P. Dabney ,
Stephen R. McKelvey ,
Daniel R. Cluck  and
Sherl L. Smith
Christopher J. Fettig*
Affiliation:
Chemical Ecology and Management of Western Forest Insects, Pacific Southwest Research Station, USDA Forest Service, Davis, California 95616, United States of America
Robert R. Borys
Affiliation:
Chemical Ecology and Management of Western Forest Insects, Pacific Southwest Research Station, USDA Forest Service, Davis, California 95616, United States of America
Christopher P. Dabney
Affiliation:
Chemical Ecology and Management of Western Forest Insects, Pacific Southwest Research Station, USDA Forest Service, Davis, California 95616, United States of America
Stephen R. McKelvey
Affiliation:
Chemical Ecology and Management of Western Forest Insects, Pacific Southwest Research Station, USDA Forest Service, Davis, California 95616, United States of America
Daniel R. Cluck
Affiliation:
Forest Health Protection, USDA Forest Service, Susanville, California 96130, United States of America
Sherl L. Smith
Affiliation:
Forest Health Protection, USDA Forest Service, Susanville, California 96130, United States of America
*
1 Corresponding author (e-mail: [email protected]).
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Abstract

The red turpentine beetle, Dendroctonus valens LeConte (Coleoptera: Scolytidae), is a common bark beetle species found throughout much of North America. In California, D. valens and the California fivespined ips, Ips paraconfusus Lanier (Coleoptera: Scolytidae), are sympatric and often colonize the same tree. In an unrelated study, we observed that I. paraconfusus attack densities in logging debris were inversely related to D. valens attacks on freshly cut stumps. In this study, we test the hypothesis that allomonal inhibition occurs between these two species. Components of the aggregation pheromone of I. paraconfusus (racemic ipsenol, (+)-ipsdienol, and (–)-cis-verbenol) inhibited the response of D. valens to attractant-baited traps. Substitution of racemic ipsdienol for (+)-ipsdienol did not alter this effect. Doubling the release rate did not enhance inhibition. Racemic ipsdienol was not attractive to I. paraconfusus. Temnochila chlorodia (Mannerheim, 1843) (Coleoptera: Trogositidae), a common bark beetle predator, was attracted to the I. paraconfusus aggregation pheromone. These results could have important implications for the development of an effective semiochemical-based management tool for D. valens.

Résumé

Le dendroctone rouge de l'épinette, Dendroctonus valens LeConte (Coleoptera : Scolytidae), est une espèce commune de scolyte répandue dans presque toute l'Amérique du Nord. En Californie, D. valens et le scolyte à cinq épines de Californie, Ips paraconfusus Lanier (Coleoptera : Scolytidae), sont sympatriques et colonisent souvent le même arbre. Dans une étude différente, nous avons observé que les densités d'attaque d'I. paraconfusus dans les débris de coupe sont inversement reliées aux attaques de D. valens sur les souches récemment coupées. Dans la présente étude, nous éprouvons l'hypothèse selon laquelle il existe une inhibition de répulsion entre ces deux espèces. Les composantes de la phéromone de rassemblement d'I. paraconfusus (l'ipsénol racémique, l'(+)-ipsdiénol, le (–)-cis-verbénol) inhibent la réaction de D. valens à des pièges munis de substances attractives. La substitution de l'ipsdiénol racémique à l'(+)-ipsdiénol ne modifie pas cet effet. Un taux de libération deux fois plus élevé n'augmente pas l'inhibition. L'ipsdiénol racémique n'attire pas I. paraconfusus. Temnochila chlorodia (Mannerheim, 1843) (Coleoptera : Trogositidae), un prédateur commun des scolytes, est attiré par la phéromone de rassemblement d'I. paraconfusus. Ces résultats peuvent avoir d'importantes conséquences sur la mise au point d'un outil de gestion efficace de D. valens, basé sur les composés sémiochimiques.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 137 , Issue 6 , December 2005 , pp. 748 - 752
Copyright
Copyright © Entomological Society of Canada 2005

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