New Pathotype Nomenclature for Better Characterisation the Virulence and Diversity of Blumeria graminis f.sp. avenae Populations

Fungal cereal pathogens, including Blumeria graminis f.sp. avenae, have the ability to adapt specific conditions, which in turn leads overcoming host resistance. An important aspect is standardized way of characterizing races and pathotypes pathogen. In presented work, for first time it was proposed use a unified letter code that allows describing B. avenae. The set 14 oat genotypes were used as differential set. This included having so far described powdery mildew resistance genes Pm1–Pm11, two (A. sterilis A. strigosa) with effective sources Bga. Based on analysis 160 Bga isolates collected 2016–2019 from 4 locations Poland, most numerous TBBB pathotype, represented by 30% tested isolates. It present all analyzed populations. Subsequently, 8.1% 6.3% TBCB RBBB pathotypes, respectively.