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Wheat bulb fly (Delia coarctata, Fallén, Diptera: Anthomyiidae) larval response to hydroxamic acid constituents of host-plant root exudates

Published online by Cambridge University Press:  23 January 2013

C.D. Rogers  and
K.A. Evans
C.D. Rogers*
Affiliation:
Institute of Evolutionary Biology, University of Edinburgh, Ashworth Laboratories, Edinburgh, EH9 3JT, UK Scottish Agricultural College, West Mains Road, Edinburgh, EH9 3JG, UK
K.A. Evans
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh, EH9 3JG, UK
*
* Author for correspondence Fax: +44 (0)131 535 4144 E-mail: [email protected]
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Abstract

Wheat bulb fly (WBF, Delia coarctata, Fallén, Diptera: Anthomyiidae) is a pest of commercial importance in wheat, barley and rye, with attacked crops failing to produce full potential yields. Females do not oviposit in association with a host-plant; therefore, prompt location of a suitable host is critical to the survival of the newly hatched larvae. The objective of this study was to conduct choice test bioassays to assess the attraction of WBF larvae to specific chemical constituents of WBF host-plant root exudates, the hydroxamic acids DIMBOA (2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one) and MBOA (6-methoxy-benzoxazolin-2-one). The larval response to four concentrations of each test compound was assessed in arena bioassays. Analysis using a Rayleigh test of uniformity of the final resting positions of larvae in response to these chemicals indicated attraction. These results go some way to explaining the mechanisms by which WBF larvae locate host plants, giving the potential to develop semiochemical based control strategies.

Keywords

chemical ecologysemiochemicalbehaviourAvena sativaattractionpestcereal
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 103 , Issue 3 , June 2013 , pp. 261 - 268
Copyright
Copyright © Cambridge University Press 2013

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