Journal of Insect Behavior

, Volume 14, Issue 6, pp 739–757

Exploitation of the Fecal Shield of the Lily Leaf Beetle, Lilioceris lilii (Coleoptera: Chrysomelidae), by the Specialist Parasitoid Lemophagus pulcher (Hymenoptera: Ichneumonidae)

Authors

    • CABI Bioscience Centre, 1 Chemin des Grillons
  • Caroline Müller
    • CABI Bioscience Centre, 1 Chemin des Grillons
    • Institute of Evolutionary and Ecological SciencesLeiden University
Article

DOI: 10.1023/A:1013085316606

Cite this article as:
Schaffner, U. & Müller, C. Journal of Insect Behavior (2001) 14: 739. doi:10.1023/A:1013085316606

Abstract

We investigated signal sources used by the parasitoid Lemophagus pulcher in locating and accepting larvae of its host, the lily leaf beetle, Lilioceris lilii. Olfactometer bioassays revealed that larvae with fecal shields, larvae without shields, the shield alone, and lily leaves damaged by L. lilii were all attractive to female parasitoids. In contact bioassays, L. pulcher females were attracted to shields and showed ovipositor probing independently of whether the larva underneath was L. lilii or a nonhost, suggesting that the shield plays a primary role in short-range host location and host acceptance by L. pulcher. The attractiveness of the shield is at least partly of a chemical nature, since shield extracts applied to dummies increased contact duration and induced ovipositor probing by L. pulcher. Another putative defense system of L. lilii, i.e., oral discharge which is emitted by disturbed larvae, was also attractive to experienced, but not to naive, female parasitoids. In all other tests, naive and experienced female L. pulcher responded to the same signal sources tested, suggesting that the host-selection behavior of this biological control candidate is governed largely by innate responses to host-associated cues.

Lemophagus pulcherLilioceris liliihost selection behaviorlarval shieldfecesbiological control
Download to read the full article text

Copyright information

© Plenum Publishing Corporation 2001