1. Department of Terrestrial Ecology (NIOO-KNAW); Netherlands Institute for Ecology; Droevendaalsesteeg 10 6708 PB Wageningen The Netherlands
2. Institute for Agricultural and Fisheries Research (ILVO); Plant Sciences Unit; Caritasstraat 21 9090 Melle Belgium
3. Laboratory of Nematology; Department of Plant Sciences; Wageningen University (WUR); PO Box 8123 6700 ES Wageningen The Netherlands