Contact Kairomones Mediating the Foraging Behavior of the Aphid Hyperparasitoid Alloxysta victrix ( Westwood ) ( Hymenoptera : Charipidae )

  • Grasswitz T
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Abstract

A variety of host-related substances was assessed in relation to their ability to induce arrestment and antennal examination behavior in adult females of the aphid hyperparasitoid Alloxysta victrix (Westwood). In laboratory bioassays, whole-body homogenates of both unparasitized host aphids [Myzus persicae (Sulzer)] and those parasitized by the primary parasitoid Aphidius colemani Viereck failed to elicit a response. However, significant kairomonal activity was associated with aphid cornicle secretions, aphid honeydew, and solvent extracts of parasitized aphids. Solvent extracts of unparasitized aphids (in either hexane or butan-1-ol) failed to elicit arrestment or antennal examination behavior in hyperparsitoid females. The response to aphid honeydew was significantly lower in "experienced" females than in naive individuals, suggesting that even rel- atively strong innate responses can be modified by learning

Author-supplied keywords

  • alloxysta victrix
  • contact cues
  • foraging behavior
  • hyperparasitoid
  • kairomones

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Authors

  • Tessa R Grasswitz

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