title: Continuous exposure to the deterrentscis-jasmone and methyl jasmonate does not alter the behavioural responses ofFrankliniella occidentalis.
abstract: Behavioural responses ofFrankliniella occidentalis(Pergande) (Thysanoptera: Thripidae), a generalist, cell sap-feeding insect species with piercing-sucking mouthparts, after continuous exposure to two deterrent secondary plant compounds are investigated. We compared in choice assays on bean leaf discs, the settling, feeding, and oviposition preferences ofF. occidentalisfemales that had no experience with the two fatty acid derivatives methyl jasmonate andcis-jasmone before testing (naïve thrips) vs. females that had been exposed to the deterrent compounds before testing (experienced thrips). The thrips were exposed to the deterrents at low or high concentrations for varied time periods and subsequently tested on bean leaf discs treated with the respective deterrent at either a low or a high concentration.Frankliniella occidentalisfemales avoided settling on the deterrent-treated bean leaf discs for an observation period of 6 h, independent of their previous experience. Our results demonstrate that feeding and oviposition deterrence of the jasmonates to the thrips were not altered by continuous exposure of the thrips to the jasmonates. Habituation was not induced, neither by exposure to the low concentration of the deterrents nor by exposure to the high concentration. These results indicate that the risk of habituation to two volatile deterrent compounds after repeated exposure is not evident inF. occidentalis. This makes the two compounds potential candidates to be integrated in pest management strategies.
authors.affiliation: Division of Plant Protection, Department of Crop Sciences, University of Natural Resources and Life Sciences (BOKU) Peter-Jordan-Straße 82, 1190, Vienna, Austria.
authors.forename: Barbara
authors.initials: B
authors.lastname: Egger
authors.affiliation: Institute of Applied Statistics and Computing (IASC), Department of Landscape, Spatial and Infrastructure Sciences, University of Natural Resources and Life Sciences (BOKU) Peter-Jordan-Straße 82, 1190, Vienna, Austria.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Spangl
authors.affiliation: Division of Plant Protection, Department of Crop Sciences, University of Natural Resources and Life Sciences (BOKU) Peter-Jordan-Straße 82, 1190, Vienna, Austria.
authors.forename: Elisabeth Helene
authors.initials: EH
authors.lastname: Koschier
keywords: Thripidae; Thysanoptera; feeding deterrence; habituation; secondary plant compound; western flower thrips