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Spacing of traps baited with species-specific Lymantria pheromones to prevent interference by antagonistic components

Published online by Cambridge University Press:  02 April 2012

Regine Gries ,
Paul W. Schaefer ,
Tadao Gotoh ,
Stephen Takács  and
Gerhard Gries
Regine Gries
Affiliation:
Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
Paul W. Schaefer
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Beneficial Insects Introduction Research, Newark, Delaware 19713, United States of America
Tadao Gotoh
Affiliation:
Forestry and Forest Products Research Institute, Tohoku Research Center, Nabeyashiki 92–25, Shimo-Kuriyagawa, Morioka, Iwate 020–0123, Japan
Stephen Takács
Affiliation:
Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
Gerhard Gries*
Affiliation:
Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
*
3Corresponding author (e-mail: [email protected]).
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Abstract

In pheromone-based surveys for detecting multiple species of exotic lymantriine moths (Lepidoptera: Noctuidae: Lymantriinae), spacing between traps baited with species-specific pheromone lures must be sufficient to prevent antagonistic effects of heterospecific pheromone on lure attractiveness. Conducting field experiments with the Japanese gypsy moth, Lymantria dispar japonica Motschulsky, in northern Honshu, Japan, we first determined which congeneric pheromone components have strong antagonistic effects on attraction of male moths to the conspecific pheromone (7R,8S)-cis-7,8-epoxy-2-methyloctadecane ((+)-disparlure). Since the most antagonistic compounds were pheromone/volatile components from the sympatric nun moth, L. monacha (L.), we then conducted experiments with paired traps baited with either a L. dispar (L.) pheromone lure ((+)-disparlure (50 µg)) or L. monacha pheromone lure (a mixture of (7R,8S)-cis-7,8-epoxyoctadecane ((+)-monachalure (50 µg)), (7Z)-2-methyloctadecene (5 µg), and (+)-disparlure (50 µg)). As spacing between paired traps increased (0, 0.5, 2, 7.5, 15, or 30 m), the antagonistic effect of the L. monacha lure on the attractiveness of the L. dispar lure decreased and finally disappeared. For pheromone-based detection surveys of multiple species of exotic lymantriine moths in North America to be effective, trap spacing of 15 m is recommended.

Résumé

Les inventaires de détection basés sur les phéromones des papillons lymantriidés exotiques (Lepidoptera : Noctuidae : Lymantriidae) nécessitent un espacement suffisant entre les pièges garnis d'appâts à phéromones spécifiques particulières pour éviter les effets antagonistes des hormones hétérospécifiques sur l'attraction des appâts. Dans des expériences de terrain avec la spongieuse japonaise, Lymantria dispar japonica Motschulsky, dans le nord du Honshû (Japon), nous avons d'abord déterminé les composantes congénériques qui ont de forts effets antagonistes sur l'attraction des papillons mâles à la phéromone conspécifique (7R,8S)-cis-7,8-époxy-2-méthyloctadécane ((+)-disparlure). Comme les composés les plus antagonistes sont la phéromone (composantes volatiles) de la nonne, L. monacha (L.), une espèce sympatrique, nous avons monté des expériences avec des pièges appariés garnis ou bien de l'appât phéromonal de L. dispar (L.) ((+)-disparlure (50 µg)) ou alors de l'appât phéromonal de L. monacha (un mélange de (7R,8S)-cis-7,8-époxyoctadécane ((+)-monachalure (50 µg)) de (7Z)-2-méthyloctadécène (5 µg) et de (+)-disparlure (50 µg). L'effet antagoniste de l'appât de L. monacha sur l'attraction de l'appât de L. dispar diminue en fonction de la distance entre les pièges appariés (0, 0,5, 2, 7,5, 15, 30 m) pour finalement disparaître. Nous recommandons un espacement de 15 m entre les pièges pour les inventaires de détection basés sur les phéromones d'espèces multiples de papillons lymantriidés exotiques en Amérique du Nord.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 141 , Issue 2 , April 2009 , pp. 145 - 152
Copyright
Copyright © Entomological Society of Canada 2009

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