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IDENTIFICATION OF SEX-PHEROMONE COMPONENTS OF THE SIBLING SPECIES EUXOA RIDINGSIANA (GRT.) AND EUXOA MAIMES (SM.) (LEPIDOPTERA: NOCTUIDAE), AND BLENDS FOR THEIR SPECIFIC ATTRACTION

Published online by Cambridge University Press:  31 May 2012

D.L. Struble  and
J.R. Byers
D.L. Struble
Affiliation:
Agriculture Canada Research Station, Lethbridge, Alberta, CanadaT1J 4B1
J.R. Byers
Affiliation:
Agriculture Canada Research Station, Lethbridge, Alberta, CanadaT1J 4B1
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Abstract

The sex-pheromone components of the sibling species Euxoa ridingsiana and Euxoa maimes were identified in abdomen-tip washes and extracts of calling female moths. Both species produced the same primary pheromone component, (Z)-9-tetradecenyl acetate (i.e. Z9-14:Ac), but they produced different amounts of secondary pheromone components. In the field, male moths of E. ridingsiana were specifically attracted to a 3-component blend of Z7-12:Ac, and Z7-14:Ac, and Z9-14:Ac in a ratio of 1:2:40 at 500 μg per dispenser, and males of E. maimes were specifically attracted to a 5-component blend of Z7-14:Ac, Z9-14:Ac, Zl 1-14:Ac, Zll-16:Ac, andZll-16:OH in a ratio of 1.5:500:5:50:2.5 at 500 μg per dispenser. Both synthetic pheromone blends were competitive with conspecific females. These pheromone analyses confirm that E. ridingsiana and E. maimes are valid biological species that can maintain their reproductive isolation solely by specific sex pheromones.

Résumé

On a identifié les composantes des phéromones sexuelles des espèces jumelles Euxoa ridingsiana et Euxoa maimes à partir de lavages de bouts d'abdomen et d'extraits de femelles en appel. Ces 2 espèces produisent la même composante phéromonale primaire, le (Z)-9-tetradecenyl acetate (c.à.d. Z9—14:Ac), mais différentes quantités de composantes phéromonales secondaires. Sur le terrain, les mâles de E. ridingsiana ont été attirés de façon particulière par un mélange des 3 composantes Z7-12:Ac, Z7-14:Ac, et Z9-14:Ac dans des proportions 1:2:40 à raison de 500 μg par dispensateur. Un mélange de 5 composantes de Z7-14:Ac, Z9-14:Ac, Z11-14:Ac, Z11-16:Ac, et Zll-16:OH dans les proportions 1.5:500:5:50:2.5 à 500 μg par dispensateur a attiré spécifiquement les mâles de E. maimes. L'attractivité des 2 mélanges se mesurait à celle de femelles conspécifiques. Ces analyses des phéromones confirment que E. ridingsiana et E. maimes sont des espèces biologiques valides pouvant maintenir leur isolement reproducteur sur la seule base de leurs phéromones sexuelles propres.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 4 , April 1985 , pp. 495 - 504
Copyright
Copyright © Entomological Society of Canada 1985

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References

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