1. Department of Biology, Agriculture and Food Sciences; The National Research Council of Italy (CNR); 00185 Roma Italy
2. Laboratory of Entomology; Wageningen University; 6700 EH Wageningen The Netherlands
3. Institute of Biochemical Plant Pathology; Research Unit Environmental Simulation; Helmholtz Zentrum München; 85764 Neuherberg Germany
4. Institute of Biology; University of Neuchâtel; CH-2009 Neuchâtel Switzerland