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Most genes for resistance to barley leaf scald map either to theRrs1locus on the long arm of chromosome 3H, or theRrs2locus on the short arm of chromosome 7H. Other loci containing scald resistance genes have previously been identified using lines derived from wild barley,Hordeum vulgaressp.spontaneum. A single dominant gene conditioning resistance to scald was identified in a third backcross (BC3F3) line derived from an Israeli accession of wild barley. The resistance gene is linked to three microsatellite markers that map to the long arm of chromosome 7H; the closest of these loci, HVM49, maps 11.5 cM from the resistance gene. As no other scald resistance genes have been mapped to this chromosome arm, it is considered to be a novel scald resistance locus. As theAcp2isozyme locus is linked to this scald resistance locus, at 17.7 cM,Acp2is assigned to chromosome 7H. Molecular markers linked to the novel scald resistance gene, designatedRrs15, can be used in breeding for scald resistance. [ABSTRACT FROM AUTHOR]