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The response of Dendroctonus valens and Temnochila chlorodia to Ips paraconfusus pheromone components and verbenone

Published online by Cambridge University Press:  02 April 2012

Christopher J. Fettig ,
Stephen R. McKelvey ,
Christopher P. Dabney  and
Roberty R. Borys
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
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
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
Roberty 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
*
1Corresponding author (e-mail: [email protected]).
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Abstract

The red turpentine beetle, Dendroctonus valens LeConte, 1860 (Coleoptera: Curculionidae, Scolytinae), is a common bark beetle found throughout much of North America and China. In 2004, we observed that attack densities of the California fivespined ips, Ips paraconfusus Lanier, 1970 (Coleoptera: Curculionidae, Scolytinae), in logging debris were inversely related to D. valens attacks on freshly cut stumps, which led to the demonstration that components of the aggregation pheromone of I. paraconfusus inhibited the response of D. valens to attractant-baited traps. In this study, we test the response of D. valens and Temnochila chlorodia (Mannerheim, 1843) (Coleoptera: Trogositidae), a common bark beetle predator, to racemic ipsenol, racemic ipsdienol, and (−)-cis-verbenol (IPSR) in the presence and absence of two release rates of (−)-verbenone. The addition of a relatively low release rate of (−)-verbenone (4 mg/24 h) to attractant-baited traps did not affect catch and had no significant effect on the response of D. valens to IPSR. IPSR significantly reduced D. valens attraction to baited traps. The addition of high release rates of (−)-verbenone (50 mg/24 h) to IPSR significantly increased inhibition; however, the effect was not significantly different from that observed with (−)-verbenone alone (50 mg/24 h). Temnochila chlorodia was attracted to traps baited with (−)-β-pinene, (+)-3-carene, and (+)-α-pinene. The addition of (−)-verbenone (50 mg/24 h) significantly increased attraction. Traps baited with IPSR caught significantly more T. chlorodia than those baited with (−)-verbenone. Few other beetles were collected. We are hopeful that these results will help facilitate the development of an effective tool for protecting Pinus spp. from D. valens infestations.

Résumé

Le dendroctone rouge de l'épinette, Dendroctonus valens LeConte, 1860 (Coleoptera: Curculionidae, Scolytinae), est un scolyte commun trouvé dans presque toute l'Amérique du Nord et la Chine. En 2004, nous avons observé que la densité des attaques du scolyte à cinq épines de Californie, Ips paraconfusus Lanier, 1970 (Coleoptera: Curculionidae, Scolytinae), dans les débris de coupe est inversement proportionnelle aux attaques de D. valens sur les souches nouvellement coupées; ceci nous a conduit à démontrer que la phéromone de rassemblement d'I. paraconfusus inhibe la réaction de D. valens à des pièges chargés de substances attractives. Dans ce travail, nous testons la réponse de D. valens et de Temnochilachlorodia (Mannerheim, 1843) (Coleoptera: Trogositidae), un prédateur commun des scolytes, à l'ipsénol racémique, à l'ipsdiénol racémique et au (−)-cis-verbenol (IPSR) en présence et en l'absence de libération de deux concentrations de (−)-verbénone. L'addition de (−)-verbénone à un taux relativement faible de libération (4 mg/24 h) dans les pièges munis de substances attractives n'affecte pas les captures et n'a pas d'effet significatif sur la réaction de D. valens à l'IPSR. L'IPSR réduit de façon significative l'attirance de D. valens pour les pièges appâtés. L'addition de (−)-verbénone à un fort taux de libération (50 mg/24 h) à l'IPSR réduit significativement l'inhibition; l'effet n'est cependant pas significativement différent de celui de la (−)-verbénone (50 mg/24 h). Temnochilachlorodia est attiré vers les pièges munis de (−)-β- pinène, de (+)-3-carène et de (+)-α-pinène. L'addition de (−)-verbénone (50 mg/24 h) augmente significativement l'attraction. Les pièges munis d'IPSR capturent significativement plus de T. chlorodia que ceux garnis de (−)-verbénone. Peu d'autres coléoptères ont été capturés. Nous croyons que ces résultats contribueront à faciliter la mise au point d'un outil efficace pour protéger les Pinus spp. des infestations à D. valens.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 139 , Issue 1 , February 2007 , pp. 141 - 145
Copyright
Copyright © Entomological Society of Canada 2007

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