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Response of Dryocoetes confusus and D. autographus (Coleoptera: Scolytidae) to enantiospecific pheromone baits

Published online by Cambridge University Press:  02 April 2012

N.L. Jeans Williams  and
J.H. Borden
N.L. Jeans Williams
Affiliation:
ForHealth Consulting, 2705 Mount Dale Place, Blind Bay, British Columbia, Canada V0E 1H1
J.H. Borden*
Affiliation:
Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
*
1 Corresponding author (e-mail: [email protected]).
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Abstract

In past field studies, the greatest response of western balsam bark beetles, Dryocoetes confusus Swaine, to traps was obtained with blends of (+)-exo-brevicomin and (+)- or (±)-endo-brevicomin, which imitate the natural male-produced aggregation pheromone. We conducted a trapping experiment comparing low-release enanti ospecific blends (9:1 (+)-exo-brevicomin:(+)-endo-brevicomin or 9:2 (+)-exo-brevicomin:(±)-endo-brevicomin released at 0.3, 0.1, or 0.03 mg per day) with the standard commercial (±)-exo-brevicomin bait released at 1.2 mg per day. Multiple-funnel traps baited with the experimental blends caught more D. confusus than the unbaited traps, but only traps with the 9:2 (+):(±) blend released at 0.3 and 0.03 mg per day caught significantly more male and female beetles than those baited with the standard bait. Thus, trap sensitivity can be improved with the addition of (±)-endo-brevicomin. The sympatric bark beetle D. autographus Ratzeburg was captured in significant numbers in traps baited with (±)-exo-brevicomin. A subsequent trapping experiment showed that D. autographus responded to (+)- or (±)-exo-brevicomin, but not to (−)-exo-brevicomin, suggesting that (+)-exo-brevicomin is the principal aggregation pheromone component in this species.

Résumé

Dans des études antérieures sur le terrain, les pièges qui ont récolté le plus de scolytes du sapin de l'Ouest, Dryocoetes confusus Swaine, contenaient un mélange d'(+)-exo-brévicomine et d'(+)-endo-brévicomine ou d'(±)-endo-brévicomine qui simule la phéromone naturelle de rassemblement produite par les mâles. Une première expérience de piégeage compare les résultats obtenus avec des mélanges énantiospécifiques à libération restreinte (9:1 d'(+)-exo-brévicomine:(+)-endo- brévicomine ou 9:2 d'(+)-exo-brévicomine:(±)-endo-brévicomine à un taux de libération de 0,3, 0,1 ou 0,03 mg/jour) à ceux produits par des appâts commerciaux réguliers d'(±)-exo-brévicomine libéré à raison de 1,2 mg/jour. Des pièges à entonnoirs multiples appâtés avec les mélanges expérimentaux ont capturé plus de D. confusus que les pièges sans appât, mais seuls les pièges contenant le mélange 9:2 (+):(±) à un taux de libération de 0,3 et de 0,03 mg/jour ont capturé significativement plus de coléoptères mâles et femelles que les pièges garnis de l'appât standard. La sensibilité des pièges peut donc être améliorée par l'addition d'(±)-endo-brévicomine. Les pièges garnis d'(±)-exo-brévicomine ont capturé des nombres significatifs du scolyte sympatrique D. autographus Ratzeburg. Une seconde expérience de piégeage a démontré que D. autographus réagit à l'(+)-exo-brévicomine ou à l'(±)-exo-brévicomine, mais non à l'(−)-exo-brévicomine, ce qui laisse penser que, chez cette espèce, l'(+)-exo-brévicomine est le composé principal de la phéromone de rassemblement.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 136 , Issue 3 , June 2004 , pp. 419 - 425
Copyright
Copyright © Entomological Society of Canada 2004

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