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Chemoecology

, Volume 20, Issue 3, pp 215–221 | Cite as

Is flower scent influencing host plant selection of leaf-galling sawflies (Hymenoptera, Tenthredinidae) on willows?

  • Alexandra Kehl
  • Stefan Dötterl
  • Gregor Aas
  • Gerhard Rambold
Short Communication

Abstract

Though it is known that flower scent not only attracts pollinators but also herbivores, little is known about the importance of flower scent on the distribution of leaf herbivores among individuals within a plant species. In this study we determined the distribution of galls induced by the sawfly Pontania proxima (Serville 1823) (Hymenoptera, Tenthredinidae, Nematinae) on flowering and non-flowering representatives of several clones belonging to Salix fragilis and S. × rubens (Salicaceae). Further, amounts and composition of scent of flowering and non-flowering twigs were compared (dynamic headspace-gas chromatography–mass spectrometry, DHS-GC–MS), and a scent sample collected from flowering twigs of S. fragilis was tested by coupled gas chromatography and electroantennographic detection (GC-EAD) on the antennae of P. proxima females. The results show that the presence of flower catkins on plants led to a higher degree of allocation with galls, but the number of galls differed not between flowering and non-flowering plants. The DHS-GC–MS analyses revealed that the total amount of flower scent emitted per flowering twig is about 90 times higher than the scent emitted by a non-flowering twig. Further, several compounds were emitted only by flowering but not by non-flowering twigs. In the GC-EAD analyses, antennae consistently responded not only to green leaf volatiles, but also to compounds emitted only by the flowers (e.g. 1,4-dimethoxybenzene). These flower scent compounds are suggested to affect the host plant choice by attracting more sawflies from the distance to flowering plants compared to non-flowering plants. The EAD-active compounds emitted from vegetative plant parts are assumed to act as long-distance signals especially when flowers are absent on host plants, e.g. during the oviposition period of the second generation of P. proxima.

Keywords

GC-EAD GC–MS Host plant selection Plant gall Pontania proxima Salix Willow Tenthredinidae 

Notes

Acknowledgments

Parts of the study were supported by the German Research Foundation DFG (Graduiertenkolleg 678). Ulrike Glück (formerly Füssel) provided flower scent samples of Salix fragilis.

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Copyright information

© Springer Basel AG 2010

Authors and Affiliations

  • Alexandra Kehl
    • 1
  • Stefan Dötterl
    • 2
  • Gregor Aas
    • 3
  • Gerhard Rambold
    • 1
  1. 1.Section of Mycology, Department of Plant SystematicsUniversity of BayreuthBayreuthGermany
  2. 2.Department of Plant SystematicsUniversity of BayreuthBayreuthGermany
  3. 3.Ecological-Botanical GardenUniversity of BayreuthBayreuthGermany

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