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The Aggregation Pheromone of Phyllotreta striolata (Coleoptera: Chrysomelidae) Revisited

GND
1016970773
Affiliation
Department of Evolutionary Neuroethology,Max Planck Institute for Chemical Ecology, Hans-Knoell-Strasse 8, D-07745 Jena, Germany
Beran, Franziska;
Affiliation
Department of Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Hans-Knoell-Strasse 8, D-07745 Jena, Germany
Jiménez-Alemán, Guillermo H.;
Affiliation
AVRDC-The World Vegetable Center, Entomology Unit, 60 Yi-min Liao, Shanhua, 74151 Tainan, Taiwan
Lin, Mei-ying;
Affiliation
AVRDC-The World Vegetable Center, Entomology Unit, 60 Yi-min Liao, Shanhua, 74151 Tainan, Taiwan
Hsu, Yun-Che;
GND
123366747
Affiliation
Department Urban Ecophysiology, Humboldt-Universität zu Berlin, Lentzeallee 55-57, D-14195 Berlin, Germany; Julius Kühn-Institute (JKI), Institute for Ecological Chemistry, Plant Analysis and Stored Product Protection, Germany
Mewis, Inga;
Affiliation
AVRDC-The World Vegetable Center, Entomology Unit, 60 Yi-min Liao, Shanhua, 74151 Tainan, Taiwan
Srinivasan, Ramasamy;
GND
122530187
Affiliation
Department Urban Ecophysiology, Humboldt-Universität zu Berlin, Lentzeallee 55-57, D-14195 Berlin, Germany
Ulrichs, Christian;
GND
1020642289
Affiliation
Department of Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Hans-Knoell-Strasse 8, D-07745 Jena, Germany
Boland, Wilhelm;
GND
120793342
Affiliation
Department of Evolutionary Neuroethology,Max Planck Institute for Chemical Ecology, Hans-Knoell-Strasse 8, D-07745 Jena, Germany
Hansson, Bill S.;
Affiliation
Department of Evolutionary Neuroethology,Max Planck Institute for Chemical Ecology, Hans-Knoell-Strasse 8, D-07745 Jena, Germany; Behavioural Ecology and Evolutionary Genetics, Max Planck Institute for Ornithology, Eberhard-Gwinner-Str. 7, 82319 Seewiesen, Germany
Reinecke, Andreas

Aggregations of the striped flea beetle Phyllotreta striolata on their crucifer host plants are mediated by volatiles emitted from feeding males. The male-specific sesquiterpene, (6R,7S)-himachala-9,11-diene (compound A), was shown previously to be physiologically and behaviorally active, but compound Awas attractive only when combined with unnaturally high doses of the host plant volatile allyl isothiocyanate (AITC) in field trapping experiments. This indicated that our understanding of the chemical communication in this species is incomplete. Another male-specific sesquiterpenoid, (3S,9R,9aS)-3-hydroxy-3,5,5,9-tetramethyl-5,6,7,8,9,9ahexahydro- 1H-benzo[7]annulen-2(3H)-one (compound G), has been reported from an American P. striolata population. We confirmed the presence of compound G, and investigated its interaction with compound A and AITC in a P. striolata population in Taiwan. Compound G was attractive to Taiwanese P. striolata in laboratory bioassays, but significantly more beetles were attracted to a blend of compounds A and G. Under the same conditions, P. striolata showed no preference for the blend of A and G combined with a range of doses of AITC over the sesquiterpenoid blend alone. The sesquiterpenoid blend was tested further in field trapping experiments and attracted significantly more beetles than traps baited with compound A and ecologically relevant amounts of AITC.We conclude that A and G are components of the malespecific aggregation pheromone of P. striolata in Taiwan, and that the attractiveness of the pheromone is not reliant on the presence of AITC. Our results further indicate that the malespecific sesquiterpenoid blends differ qualitatively between the Taiwanese and American populations of P. striolata.

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