1. Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, The Netherlands.
2. Environmental Systems Analysis Group, Wageningen University and Research Centre, Wageningen, The Netherlands.
3. Biometris, Wageningen University and Research Centre, Wageningen, The Netherlands.
4. Veterinary Clinic 't Heike, Veldhoven, The Netherlands.
5. Plant Research International, Wageningen University and Research Centre, Wageningen, The Netherlands.