Summary
Contact kairomones and oviposition in a host egg stimulated arrestment behaviour in Trichogramma evanescens, characterised by a reduction in walking speed and increased turning. Previous oviposition experience did not influence a parasitoid's response to contact kairomones, but successive encounters with kairomone patches resulted in parasitoids habituating to the contact chemical. Oviposition on a kairomone patch did not reverse this habituation effect. It was concluded that contact kairomones and host eggs will both contribute independently to the duration of a patch visit. The selection of patches by T. evanescens will depend on its response to kairomones. Results from this study indicate that the application of contact kairomones to field crops will not necessarily increase the probability of parasitoids finding hosts.
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Gardner, S.M., van Lenteren, J.C. Characterisation of the arrestment responses of Trichogramma evanescens . Oecologia 68, 265–270 (1986). https://doi.org/10.1007/BF00384798
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DOI: https://doi.org/10.1007/BF00384798