1. Department of Phytopathology and Entomology, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 17, 10‐718 Olsztyn, Poland,
2. Department of Biology, University of Zielona Góra, Szafrana 1, 65‐516 Zielona Góra, Poland, and
3. Department of Plant Physiology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10‐718 Olsztyn, Poland