Journal of Chemical Ecology

, Volume 20, Issue 7, pp 1725–1734 | Cite as

Plant-natural enemy association in the tritrophic system,Cotesia rubecula-Pieris rapae-brassiceae (cruciferae): I. Sources of infochemicals

  • Nicky G. Agelopoulos
  • Michael A. Keller
Article

Abstract

The role of airborne infochemicals in host selection by the parasitoidCotesia rubecula (Marshal) (Hymenoptera: Braconidae) was examined in a wind tunnel. To elucidate the role of volatile chemicals in attractingC. rubecula to cabbage infested by the host [Pieris rapae L. (Lepidoptera: Pieridae)], the potential sources of volatiles related toP. rapae infestation on cabbage were tested individually. The responses of females to nonhost plant species, bean and geranium, as well as to frass of a nonhost lepidopteran were also examined.C. rubecula was attracted to cabbage previously infested byP. rapae and to frass and regurgitate ofP. rapae. No attraction was observed to larvae ofP. rapae alone. Females were also attracted to mechanically damaged cabbage, cabbage previously infested byPlutella xylostella L. (Lepidoptera: Plutellidae) (a nonhost lepidopteran herbivore), and cabbage previously infested by snails (a nonhost, noninsect herbivore). Intact cabbage, bean, and geranium plants elicited no attraction. A low frequency of attraction was observed to mechanically damaged bean and geranium. Attraction was also observed to frass ofP. xylostella. Volatiles from cabbage related to damage, and volatiles from frass and regurgitate of the host seem to play an important role in guidingC. rubecula to plants infested by its host.

Key Words

Cotesia rubecula Hymenoptera Braconidae Lepidoptera Pieridae Plutellidae Pieris rapae Brassica oleracea Plutella xylostella Phaselus vulgaris Geranium molle tritrophic interactions infochemicals volatiles 

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Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • Nicky G. Agelopoulos
    • 1
  • Michael A. Keller
    • 1
  1. 1.Department of Crop Protection Waite CampusUniversity of AdelaideGlen OsmondAustralia

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