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Electrophysiological and behavioral responses of female African rice gall midge, Orseolia oryzivora Harris and Gagné, to host plant volatiles

Ogah, Emmanuel O., Smart, Lesley E., Woodcock, Christine M., Caulfield, John C., Birkett, Michael A., Pickett, John, Nwilene, Francis E. and Bruce, Toby J. 2017. Electrophysiological and behavioral responses of female African rice gall midge, Orseolia oryzivora Harris and Gagné, to host plant volatiles. Journal of Chemical Ecology 43 (1) , pp. 13-16. 10.1007/s10886-016-0788-6

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Abstract

African rice gall midge, Orseolia oryzivora Harris and Gagné, is a major pest of rice in Africa. Depsite its economic importance, its chemical ecology is not well understood. Here, we assessed behavioral and electrophysiological responses of O. oryzivora to host plant volatiles. In olfactometer bioassays, mated female O. oryzivora were attracted to volatiles emitted from intact rice plants but were repelled by volatiles collected from plants infested by conspecifics. In a choice test, there was a preference for volatiles from uninfested plants over those from infested plants. Coupled gas chromatography-electroantennography analyses of panicle volatiles isolated four electrophysiologically active components: (S)-linalool, 4,8-dimethyl-1,3,7-nonatriene, (E)-caryophyllene, and (R/S)-(E)-nerolidol. A synthetic blend of volatiles at the same concentration and ratio as that from an intact plant was attractive to mated females, whereas a blend based on the ratio of volatiles from an infested plant was repellent. This suggests that O. oryzivora uses olfaction for host plant recognition. The identification of blends of volatiles emitted by plants that can both attract and repel O. oryzivora may aid the development of sustainable control measures.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Springer
ISSN: 0098-0331
Date of First Compliant Deposit: 22 November 2017
Date of Acceptance: 4 November 2016
Last Modified: 08 Dec 2017 10:55
URI: http://orca.cf.ac.uk/id/eprint/106904

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