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Host examination walk and oviposition site selection ofTrichogramma minutum: Studies on spherical hosts

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Abstract

The host examination behavior of the parasitoid wasp Trichogramma minutumon spherical Manduca sextahosts is described. The mean walking speed during host examination was 0.64 ± 0.03 mm s −1 and is independent of wasp size. The paths taken by the wasps are not evenly distributed over the host surface; the majority of time is spent below 45 ° latitude. The distribution of oviposition sites is also nonrandom with respect to latitude and is not influenced by phototaxic and geotaxic responses. The initial transit made by the wasps over the host surface is a straight path which frequently passes across the highest point on the host. The length and duration of the initial transit are independent of wasp body length. However, stride length and stepping rates are proportional to wasp body length, and small wasps take more steps to complete their initial transit. The roles of the examination walk in host recognition and host volume measurement by Trichogrammaare also discussed.

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  1. J. M. Schmidt

    Present address: Department of Environmental Biology, University of Guelph, N1G 2W1, Guelph, Ontario, Canada

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  1. Department of Zoology, University of Toronto, M5S 1A1, Toronto, Ontario, Canada

    J. M. Schmidt & J. J. B. Smith

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Schmidt, J.M., Smith, J.J.B. Host examination walk and oviposition site selection ofTrichogramma minutum: Studies on spherical hosts. J Insect Behav 2, 143–171 (1989). https://doi.org/10.1007/BF01053289

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