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Research article - Peer-reviewed, 2008

Discrepancy in laboratory and field attraction of apple fruit moth Argyresthia conjugella to host plant volatiles

Knudsen, Geir Kjolberg; Bengtsson, Marie; Kobro, Sverre; Jaastad, Gunnhild; Hofsvang, Thor; Witzgall, Peter

Abstract

Apple fruit moth Argyresthia conjugella is a specialist seed predator of rowan Sorbus aucuparia. Large-scale synchronous fluctuation of seed production in rowan (i.e. named masting) drives the apple fruit moth to seek alternative host plants such as apple, during years when rowan berries are not available for oviposition. The role of plant volatile compounds in the attraction of gravid apple fruit moth females is studied in a laboratory wind tunnel. Volatiles from rowan branches with green berries stimulate female moths to fly upwind and to land at the odour source. By contrast, females are not attracted to rowan branches without green berries, and they are not attracted to apple, demonstrating that the chemical stimulus from rowan berries is required for attraction. Attraction to synthetic compounds identified from rowan, anethole and 2-phenyl ethanol confirms the role of plant volatiles in host finding. These two compounds, however, show a discrepant behavioural effect in wind tunnel and field tests. Field traps baited with 2-phenyl ethanol capture female moths but anethole does not produce significant captures. Wind tunnel tests produce the opposite results: moths fly upwind towards the anethole lure, whereas 2-phenyl ethanol is not attractive at all. Wind tunnel attraction to 2-phenyl ethanol is achieved by adding odour from a rowan branch without berries, which is not attractive on its own. This finding demonstrates that interaction with the background odour contributes to the behavioural effect of plant volatile stimuli in the field.

Keywords

anethole; background odour; host plant attraction; 2-phenyl ethanol; rowan; volatile organic compounds

Published in

Physiological Entomology
2008, volume: 33, number: 1, pages: 1-6

Authors' information

Knudsen, Geir Kjolberg
Norwegian Institute for Agricultural and Environmental Research (Bioforsk)
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Kobro, Sverre
Jaastad, Gunnhild
Hofsvang, Thor
Swedish University of Agricultural Sciences, Department of Plant Protection Biology

UKÄ Subject classification

Zoology
Behavioral Sciences Biology
Ecology
Food Science
Horticulture
Environmental Sciences related to Agriculture and Land-use

Publication Identifiers

DOI: https://doi.org/10.1111/j.1365-3032.2007.00592.x

URI (permanent link to this page)

https://res.slu.se/id/publ/44158