Contact kairomones mediating the foraging behavior of the aphid hyperparasitoid Alloxysta victrix (Westwood) (Hymenoptera: Charipidae)

  • Grasswitz T
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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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  • Tessa R. Grasswitz

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