1. Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Kamýcká 156, 163 00 Prague, Czech Republic
2. Institute of Forest Ecology, Slovak Academy of Sciences, Štúrova 2, 960 53 Zvolen, Slovakia
3. The Military Forests and Farms of the Czech Republic, Lipník Nad Bečvou Division, 751 31 Lipník nad Bečvou, Czech Republic
4. Department of Plant Protection Biology, Chemical Ecology, Swedish University of Agricultural Sciences, Alnarp, 234 22 Lomma, Sweden