Sex attractant pheromone of damson-hop aphid Phorodon humuli (Homoptera,aphididae) |
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Authors: | C. A. M. Campbell G. W. Dawson D. C. Griffiths J. Pettersson J. A. Pickett L. J. Wadhams C. M. Woodcock |
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Affiliation: | (1) AFRC Institute of Horticultural Research, East Mailing, ME19 6BJ Maidstone, Kent, UK;(2) AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, AL5 2JQ Harpenden, Herts, UK;(3) Swedish University of Agricultural Sciences, P.O. Box 7044, S-750 07 Uppsala, Sweden |
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Abstract: | Behavioral studies using an olfactometer demonstrated that sexual females (oviparae) of the damson-hop aphid,Phorodon humuli, release a pheromone to which males respond. Volatiles produced by the oviparae were analyzed by coupled gas chromatography-single cell recording from the secondary rhinaria on the male antenna and showed the presence of one peak with major activity. Coupled gas chrornatography-mass spectrometry suggested a nepetalactol, which was shown to have the 4aR, 7S, 7aS stereochemistry by synthesis from the corresponding nepetalactone isolated from the labiate plantNepeta mussinii. Although the stereochemistry at carbon-1 is not yet established, a synthetic sample comprising ca. 70% 1S and 30% 1R attracted highly significant numbers of males to water traps placed within and adjacent to a hop garden. Initial studies also indicated attraction of males in both the olfactometer and in the field by volatiles from the primary host. |
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Keywords: | Pheromone sex attractant aphid Phorodon humuli Homoptera Aphididae nepetalactol monoterpenoid electrophysiology single cell recording mass spectrometry |
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