1. Dept of Ecology, Swedish Univ. of Agricultural Sciences, Uppsala, Sweden. LM also at: DAFNAE-Entomology; Univ. of Padova; Padova Italy
2. Norwegian Inst. of Bioeconomy Research; Ås Norway
3. Dept of Physical Geography and Ecosystem Science; Lund Univ.; Lund Sweden
4. USDA Forest Service, Rocky Mountain Research Station; UT USA
5. Dept of Forest and Conservation Sciences; Univ. of British Columbia; Vancouver Canada
6. Swiss Federal Research Inst. WSL; Birmensdorf Switzerland
7. Grégoire, Biological Control and Spatial Ecology, Univ. Libre de Bruxelles; Brussels Belgium
8. Dept of Forest Protection; Section Beetles and Test Plant Protection, Northwest German Forest Research Inst. (NW-FVA); Göttingen Germany
9. Ministère de Agriculture, de Alimentation et de la Forêt, Dépt Santé des Forêts; Seichamps France
10. Dept of Forest and Soil Sciences, BOKU -; Univ. of Natural Resources and Life Sciences, Inst. of Forest Entomology, Forest Pathology and Forest Protection; Wien Austria
11. Dept of Geosciences and Natural Resource Management; Univ. of Copenhagen; Frederiksberg C. Denmark
12. National Park Service, Inventory and Monitoring Program; Fredericksburg USA