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A host-plant-derived volatile blend to attract the apple blossom weevil Anthonomus pomorum – the essential volatiles include a repellent constituent

Authors


  • The contents of this manuscript were presented at the National Science Meeting of the Royal Entomological Society, July 2012.

Correspondence to: Silvia Dorn, ETH Zurich, Institute of Agricultural Sciences/Applied Entomology, Schmelzbergstrasse 9/LFO, 8092 Zurich, Switzerland. E-mail: silvia.dorn@ipw.agrl.ethz.ch

Abstract

Background

Plant volatiles are promising cues for trapping pest insects. This study started with a recently identified complex blend released by prebloom apple trees and aimed to reduce the number of compounds in the blend while maintaining the attraction of the target pest, the apple blossom weevil Anthonomus pomorum. An evaluation was made to determine whether attraction to plant volatiles is a general feature in this species.

Results

Laboratory-based bioassays with field-collected weevils demonstrated repellency by volatiles from the non-host walnut, indicating that preference for plant odours is not a general feature in this species. By a subtractive bioassay approach, the original number of compounds in the apple-plant-released blend was stepwise reduced from 12 to 6 while maintaining weevil attraction. This resulting blend was as attractive as the full blend and as a blossom-bud-carrying apple twig. It was found to be composed of two synergistically interacting constituents, of which the first containing benzenoids was behaviourally inactive, and the second comprising the remaining compounds was even repellent.

Conclusions

This study enhances knowledge of the interaction of behaviourally effective constituents in complex odour blends and contributes to the development of an efficient monitoring system involving plant volatiles for the apple blossom weevil. © 2013 Society of Chemical Industry

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