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Naturwissenschaften

, Volume 92, Issue 1, pp 20–25 | Cite as

Mastrus ridibundus parasitoids eavesdrop on cocoon-spinning codling moth, Cydia pomonella, larvae

  • Zaid Jumean
  • Tom Unruh
  • Regine Gries
  • Gerhard GriesEmail author
Short Communication

Abstract

Cocoon-spinning larvae of the codling moth, Cydia pomonella L. (Lepidoptera: Olethreutidae) employ a pheromone that attracts or arrests conspecifics seeking pupation sites. Such intraspecific communication signals are important cues for illicit receivers such as parasitoids to exploit. We tested the hypothesis that the prepupal C. pomonella parasitoid Mastrus ridibundus Gravenhorst (Hymenoptera: Ichneumonidae) exploits the larval aggregation pheromone to locate host prepupae. In laboratory olfactometer experiments, female M. ridibundus were attracted to 3-day-old cocoons containing C. pomonella larvae or prepupae. Older cocoons containing C. pomonella pupae, or larvae and prepupae excised from cocoons, were not attractive. In gas chromatographic-electroantennographic detection (GC-EAD) analyses of bioactive Porapak Q extract of cocoon-derived airborne semiochemicals, ten compounds elicited responses from female M. ridibundus antennae. Comparative GC-mass spectrometry of authentic standards and cocoon-volatiles determined that these compounds were 3-carene, myrcene, heptanal, octanal, nonanal, decanal, (E)-2-octenal, (E)-2-nonenal, sulcatone, and geranylacetone. A synthetic 11-component blend consisting of these ten EAD-active compounds plus EAD-inactive (+)-limonene (the most abundant cocoon-derived volatile) was as effective as Porapak Q cocoon extract in attracting both female M. ridibundus and C. pomonella larvae seeking pupation sites. Only three components could be deleted from the 11-component blend without diminishing its attractiveness to M. ridibundus, which underlines the complexity of information received and processed during foraging for hosts. Mastrus ridibundus obviously “eavesdrop” on the pheromonal communication signals of C. pomonella larvae that reliably indicate host presence.

Keywords

Test Stimulus Limonene Aggregation Pheromone Pheromonal Communication Codling Moth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Z.J. thanks Thelma Finlayson for a Finlayson Fellowship, and T.U. thanks the Washington Tree Fruit Research Commission for grants supporting parasitoid introduction. We also thank C. Lowenberger, M. Mackauer, P. Landolt, B. Roitberg, and G.J.R. Judd for review of the manuscript. The research was further supported by a grant from NSERC to G.G. Insects were maintained in SFU’s Global Forest Quarantine Facility (GF-18–2000-SFU-6).

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Zaid Jumean
    • 1
  • Tom Unruh
    • 2
  • Regine Gries
    • 1
  • Gerhard Gries
    • 1
    Email author
  1. 1.Department of Biological SciencesSimon Fraser UniversityBurnabyCanada
  2. 2.Yakima Agricultural Research LaboratoryUSDA-ARSWapatoUSA

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