Tuesday, December 12, 2006 - 8:17 AM

Spatial interactions between the parasitoid Cotesia glomerata and nectar plants

Silvia Dorn, silvia.dorn@ipw.agrl.ethz.ch1, Heike Wanner1, Hainan Gu1, and Detlef GŁnther2. (1) ETH Zurich, Institute of Plant Sciences/Applied Entomology, Schmelzbergstrasse 9, Zurich, Switzerland, (2) ETH Zurich, Laboratory of Inorganic Chemistry, Wolfgang-Pauli-Strasse 10, Zurich, Switzerland

A new internal marking technique using the rare stable isotope 44Ca was developed for the gregarious endoparasitoid Cotesia glomerata, which parasitizes Pieris brassicae larvae. Released wasps marked their host caterpillars reliably through oviposition. The effect of selected flowering nectar plants on parasitoid flight and parasitism was quantified in the field in mark-release studies over a period of 3 days, as well as in laboratory experiments. They proved that female wasps successfully convert floral nectar from dill (Anethum graveolens) into flight energy.

Species 1: Hymenoptera Braconidae Cotesia glomerata
Species 2: Lepidoptera Pieridae Pieris brassicae (cabbage white butterfly)

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