1. University of Warmia and Mazury in Olsztyn, Dept. of Diagnostics and Pathophysiology of Plants, Pl. Łódzki 5, 10–727 Olsztyn, Poland
2. Forest Research Institute, Forest Protection Deptartment, Sękocin Stary, ul. Braci Leśnej 3, 05–090 Raszyn, Poland
3. Forest Research Institute, Laboratory of Molecular Biology, Sękocin Stary, ul. Braci Leśnej 3, 05–090 Raszyn, Poland