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Olfactory behavior of convergent lady beetles (Coleoptera: Coccinellidae) to alarm pheromone of green peach aphid (Hemiptera: Aphididae)

Published online by Cambridge University Press:  31 May 2012

E.B. Acar ,
J.C. Medina ,
M.L. Lee  and
G.M. Booth
E.B. Acar
Affiliation:
Department of Zoology, Brigham Young University, Provo, Utah, United States 84602
J.C. Medina
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah, United States 84602
M.L. Lee
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah, United States 84602
G.M. Booth*
Affiliation:
Department of Zoology, Brigham Young University, Provo, Utah, United States 84602
*
2 Author to whom all correspondence should be sent (e-mail: [email protected]).
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Abstract

A previous investigation from our laboratory showed that the odor of live green peach aphids, Myzus persicae (Sulzer), highly attracts the convergent lady beetle, Hippodamia convergens Guérin-Méneville. In this study, we isolated the odor and identified it as (E)-β-farnesene (an aphid alarm pheromone) using gas chromatography – mass spectrometry. The olfactory response of the convergent lady beetle to (E)-β-farnesene was investigated using an eight-arm air-flow olfactometer and tracing the pathways of the lady beetles. The results clearly indicate that H. convergens can perceive and orient to (E)-β-farnesene released by green peach aphids. These findings suggest that this species of lady beetle has evolved a sensory system for detecting the green peach aphid alarm pheromone as a means of finding its prey.

Résumé

Une recherche antérieure dans notre laboratoire avait démontré que l’odeur de Pucerons verts du pêcher, Myzus persicae (Sulzer), vivants attire fortement la Coccinelle convergente, Hippodamia convergens Guérin-Méneville. Nous avons isolé l’odeur et l’avons identifiée par chromatographie en phase gazeuse et spectrométrie de masse. Il s’agit de l’(E)-β-farnésène (phéromone d’alerte des pucerons). La réponse olfactive de la Coccinelle convergente a été évaluée au moyen d’un olfactomètre à air, à huit bras, et par l’étude des parcours empruntés par les coccinelles. Les résultats montrent clairement que la coccinelle est capable de percevoir la phéromone émise par les pucerons et de s’orienter en conséquence. Il semble donc que cette espèce de coccinelle ait développé un système sensoriel propre à détecter la phéromone d’alerte du Puceron vert du pêcher et ainsi de repérer ses proies.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 133 , Issue 3 , June 2001 , pp. 389 - 397
Copyright
Copyright © Entomological Society of Canada 2001

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