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Does larval aggregation pheromone of codling moth, Cydia pomonella, induce attraction or arrestment of receivers?

Published online by Cambridge University Press:  03 March 2008

Z. Jumean ,
C. Wood  and
G. Gries
Z. Jumean
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British ColumbiaV5A 1S6
C. Wood
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British ColumbiaV5A 1S6
G. Gries*
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British ColumbiaV5A 1S6
*
*Author for correspondence Fax: 1 (778) 782 3496 E-mail: gries@sfu.ca
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Abstract

Cocoon-spinning larvae of the codling moth, Cydia pomonella, emit a pheromone that mediates aggregation by pupation site-seeking fifth-instar larvae. It was unknown and, thus, we tested whether the aggregation pheromone induces arrestment or attraction responses. In paired straight-tube experiment 1, fifth-instars moved faster and farther upwind toward cospecific cocoons compared to blank controls. In still-air cage experiment 2, fifth-instars selected more often as first and final choices of pupation sites those with cocooning conspecifics than those without. Finally, in Y-tube olfactometer experiment 3, fifth-instars anemotactically responded to, and preferred, side arms with cocooning conspecifics to those without. Our data provide evidence that codling moth larvae are attracted to, rather than merely arrested by, larval aggregation pheromone. These results help explain reported aggregations or clumped distributions of larvae on tree trunks, which would likely not occur if they were based merely on chance encounter of cocoon-spinning larvae by foraging larvae.

Keywords

codling mothCydia pomonellaaggregationpheromoneattractarrest
Type
Short Communication
Information
Bulletin of Entomological Research , Volume 98 , Issue 4 , August 2008 , pp. 425 - 429
Copyright
Copyright © 2008 Cambridge University Press

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