The Response Specificity of <Emphasis Type="Italic">Trichogramma</Emphasis> Egg Parasitoids towards Infochemicals during Host Location |
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Authors: | Nina E Fatouros Gabriella Bukovinszkine’Kiss Marcel Dicke Monika Hilker |
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Institution: | 1.Institute of Biology, Freie Universit?t Berlin,Berlin,Germany;2.Laboratory of Entomology,Wageningen Universiteit,Wageningen,The Netherlands;3.Institute of Biology,Freie Universit?t Berlin,Berlin,Germany |
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Abstract: | Parasitoids are confronted with many different infochemicals of their hosts and food plants during host selection. Here, we
investigated the effect of kairomones from the adult host Pieris brassicae and of cues present on Brussels sprout plants infested by P. brassicae eggs on the behavioral response of the egg parasitoid Trichogramma evanescens. Additionally, we tested whether the parasitoid’s acceptance of P. brassicae eggs changes with different host ages. The wasps did not discriminate between olfactory cues from mated and virgin females
or between mated females and males of P. brassicae. T. evanescens randomly climbed on the butterflies, showing a phoretic behavior without any preference for a certain sex. The parasitoid
was arrested on leaf parts next to 1-day-old host egg masses. This arrestment might be due to cues deposited during oviposition.
The wasps parasitized host eggs up to 3 days old equally well. Our results were compared with former studies on responses
by T .brassicae showing that T. evanescens makes less use of infochemicals from P. brassicae than T. brassicae. |
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Keywords: | host finding oviposition-induced plant synomone phoresy Brussels sprout plants Pieris brassicae |
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