Effect of experience on in-flight orientation to host-associated cues in the generalist parasitoidLysiphlebus testaceipes |
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| Authors: | T R Grasswitz and T D Paine |
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| Affiliation: | (1) Department of Entomology, University of California, 92507 Riverside, CA, USA;(2) Present address: Tree Fruit Research and Extention Center, Washington State University, 1100 N. Western Ave., 98801 Wenatchee, WA, USA |
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| Abstract: | The effect of experience on the responsiveness of the aphidiid parasitoidLysiphlebus testaceipes (Cresson) (Hymenoptera: Aphidiidae) to host-associated cues was investigated using a wind-tunnel bioassay. Naive females
were able to discriminate between uninfested wheat (Triticum aestivum L.) and wheat infested withSchizaphis gramimum (Rondani) (Homoptera: Aphididae), but oviposition experience significantly increased the parasitoid's propensity to respond
to aphid-infested plants with upwind, targeted flight. The behavioural change associated with such experience was acquired
rapidly (within five minutes) and persisted for at least 24 h. The parasitoid could be successfully conditioned to associate
a novel odour with the presence of hosts, suggesting that the increase in response to aphid-infested plants which occurs as
a result of experience is probably due to associative learning of olfactory cues from the plant-aphid complex. |
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| Keywords: | Hymenoptera Aphidiidae Homoptera Aphididae Schizaphis graminum wheat tritrophic interactions learning host-habitat location |
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