1. Department of Ecology; Swedish University of Agricultural Sciences; SE-750 07 Uppsala Sweden
2. Tromsø University Museum, University of Tromsø; NO-9037 Tromsø Norway
3. Department of Earth Sciences; Uppsala University; Villavägen 16 SE-752 36 Uppsala Sweden
4. Universita di Padova, DAFNAE-Entomologia, Agripolis; Viale dell′Universita 16 35020 Legnaro PD Italia
5. Alterra, Wageningen UR, Centre Ecosystems; PO Box 47 NL-6700 AA Wageningen The Netherlands
6. DGFAR Sous-Direction de la Forêt et du Bois; Département de la santé des forêts; 19 Avenue du Maine 75732 Paris Cedex 15 France
7. Forest Research and Management Institute of Bucharest; Bucharest Romania
8. Department of Forest Protection; Forest Research Institute; PO Box 2 3232 Mátrafüred Hungary
9. Department of Forest Protection; Forest Research Institute of Baden-Württemberg; Wonnhaldenstrasse 4 D-79100 Freiburg i. Br Germany
10. Zoological Museum of Amsterdam; University of Amsterdam; Plantage Middenlaan 64 NL-1018 DH Amsterdam The Netherlands
11. Faculty of Forestry; University of Belgrade; Kneza Višeslava 1 11030 Belgrade Serbia
12. All-Russian Research Institute for Silviculture and Mechanization of Forestry; Pushkino Moscow region Russia
13. Faculty of Forestry; University of Zagreb; PO Box 422 10002 Zagreb Croatia
14. Department for Forest Protection and Game Management; Croatian Forest Research Institute; Cvjetno naselje 41 10450 Jastrebarsko Croatia
15. Laboratory of Forest Protection; Ukrainian Research Institute of Forestry and Forest Melioration; Pushkinska 86 61024 Kharkov Ukraine
16. Sustainable Forest Management Research Institute, University of Valladolid; Avd. Madrid s/n 34071 Palencia Spain
17. Institute of Forestry Science, Russian Academy of Sciences; Uspenskoe Moscow region 143030 Russia