Abstract
The sex pheromones of many aphid species from the subfamily Aphididae comprise a mixture of the iridoids (cyclopentanoids) (1R,4aS,7S,7aR)-nepetalactol and (4aS,7S,7aR)-nepetalactone. In this paper, we investigate whether other chemicals, in addition to nepetalactol and nepetalactone, are released from Dysaphis plantaginea (rosy apple aphid) oviparae as part of their sex pheromone. Four compounds present in an air entrainment sample collected from D. plantaginea oviparae feeding on apple (Malus silvestris c.v. Braburn) elicited electrophysiological responses from male D. plantaginea. Active peaks were tentatively identified by gas chromatography (GC) coupled with mass spectrometry, with identification confirmed by peak enhancement with authentic compounds on GC columns of different polarities. The electroantennography-active chemicals were (1R,4aS,7S,7aR)-nepetalactol, (4aS,7S,7aR)-nepetalactone, (1S,2R,3S)-dolichodial, and phenylacetonitrile. (1S,2R,3S)-Dolichodial elicited a behavioral response from male D. plantaginea and naïve-mated female parasitoids, Aphidius ervi. This is the first report of electrophysiological and behavioral responses from any aphid morph to (1S,2R,3S)-dolichodial. Whether or not (1S,2R,3S)-dolichodial is a third component of the aphid sex pheromone is discussed.
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Rothamsted Research receives grant-aided support from the Biotechnology and Biological Sciences Research Council (BBSRC) of the UK. This work was supported by funds from the UK Department for Environment, Food and Rural Affairs. Rothamsted Research receives grant-aided support from the UK. Many thanks to Dr Salvador Gezan who provided statistical guidance and Tom Palmer, manager of the Leckford Estate Fruit Farm, for permission to use the apple orchards.
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Dewhirst, S.Y., Birkett, M.A., Fitzgerald, J.D. et al. Dolichodial: A New Aphid Sex Pheromone Component?. J Chem Ecol 34, 1575–1583 (2008). https://doi.org/10.1007/s10886-008-9561-9
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DOI: https://doi.org/10.1007/s10886-008-9561-9