A total of 656 isolates of Blumeria graminis were collected from wheat and triticale plants in Poland from 2008 to 2011. In population from wheat high level of virulence to wheat were observed. Isolates from triticale had lover level of virulence to wheat than isolates from wheat. All isolates were avirulent to Pm21, only few were virulent to Pm29. In population from wheat lover level of virulence to triticale were observed than in population from triticale. To two triticale varieties: Grenado and Dinaro virulence were very low. Most isolates from wheat were virulent to 10, 11, 12 and 13 wheat cultivars. Avirulence isolates to triticale accounted for 51% of the population. Most isolates from triticale were virulent to 4 wheat cultivars, and to 6 and 7 triticale cultivars.

W latach 2008–2011 testowano 656 izolatów Blumeria graminis pochodzących z pszenicy i pszenżyta. Obserwowano wysoki poziom wirulencji izolatów pochodzących z pszenicy wobec odmian pszenicy ze znanymi genami odporności Pm. Izolaty z pszenżyta charakteryzowały się mniejszą wirulencją wobec odmian pszenicy. Izolaty z obydwu populacji były awirulentne wobec linii pszenicy z genem Pm21, a tylko kilka z nich wirulentnych wobec Pm29. W populacji B. graminis z pszenicy obserwowano mniejszy poziom wirulencji do odmian pszenżyta, niż w populacji pochodzącej z pszenżyta. Wobec odmian: Grenado i Dinaro wirulencja była na niskim poziomie. Większość izolatów pochodzących z pszenicy było wirulentnych wobec 10, 11, 12 i 13 odmian pszenicy. Izolaty awirulentne do odmian pszenżyta stanowiły 51% populacji. Wśród izolatów B. graminis zebranych z odmian pszenżyta przeważały wirulentne wobec 4 odmian pszenicy, a także 6 i 7 odmian pszenżyta.

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