Powder Mildew Resistance in 268 Entries ofHordeÛm Vulgares. l.

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Abstract
A collection of 24 ‘Spontaneum’ barley entries and one comprising 244 Ethiopian barleys were tested for resistance to four powdery mildew cultures that carried genes for virulence corresponding to most of the known powdery mildew resistance genes. The infection types and spectra of resistance were compared to those of 31 test lines with 35 known resistance genes in order to find possible ‘new’ resistance genes, and to reveal known resistance genes. The collections may possess some ‘new’ and some known resistance genes, but most were not effective against all four pathogen cultures. On the other hand, five ‘Spontaneum’ barley entries were resistant with the same low infection type of all four cultures and thus appear to have an effective resistance that may be useful for resistance breeding.