CHEMOECOLOGY

, Volume 12, Issue 4, pp 169–176 | Cite as

GC-EAG-analysis of volatiles from Brussels sprouts plants damaged by two species of Pieris caterpillars: olfactory receptive range of a specialist and a generalist parasitoid wasp species

  • Hans M. Smid
  • Joop J.A. van Loon
  • Maarten A. Posthumus
  • Louise E.M. Vet

Summary.

Feeding by Pieris brassicae or P. rapae caterpillars on Brussels sprouts plants induces the emission of synomones that attract natural enemies of the caterpillars, Cotesia glomerata, a generalist parasitoid, and C. rubecula, a specialist on P. rapae. Previous research on this tritrophic system has identified a large number of volatiles in the headspace of herbivore-damaged Brussels sprouts plants, and this paper addresses the question which of these volatiles are perceived by the two parasitoid species. Headspace odors from both P. brassicae- and P. rapae-damaged Brussels sprouts plants were analyzed by coupled gas chromatography electro- antennogram (GC-EAG) detection. Twenty volatiles evoked consistent EAG reactions in the antennae of both species and nineteen of these volatiles could be identified with GC-MS. One component that could not be identified due to its low concentration, evoked EAG responses in antennae of C. rubecula only. Possible consequences for searching behavior of the two parasitoid species are discussed.

Key words. Lepidoptera — Pieridae — Hymenoptera — Braconidae — Cotesia glomerata — Cotesia rubecula — Brussels sprouts — Brassicae oleracea — GC-EAG — tritrophic interactions — specialist — generalist 

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Copyright information

© Birkhäuser Verlag, Basel, 2002

Authors and Affiliations

  • Hans M. Smid
    • 1
  • Joop J.A. van Loon
    • 1
  • Maarten A. Posthumus
    • 2
  • Louise E.M. Vet
    • 1
  1. 1.Laboratory of Entomology, Wageningen University and Research Centre, Binnenhaven 7, NL-6709 PD Wageningen, The NetherlandsNL
  2. 2.Laboratory of Organic Chemistry, Wageningen University and Research Centre, Dreijenplein 8, NL-6703 HB Wageningen, The NetherlandsNL

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