1. Ecology, Diagnostics and Genetic Resources of Agriculturally Important Viruses, Fungi and Phytoplasmas, Crop Research Institute, Drnovská 507, 161 06 Prague, Czech Republic
2. Department of Plant Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague, Czech Republic
3. Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Branišovská 31, 370 05 České Budějovice, Czech Republic
4. Emeritus Faculty, Australian National University, Canberra 2601, Australia