Pathogenicity of Some European Collections of Crown Rust (<i>Puccinia coronata</i> Corda) on Cultivars of Perennial Ryegrass

Abstract

Abstract Three collections of crown rust ( Puccinia coronata ), from Czechoslovakia, West Germany and the U.K., were tested for their pathogenicity on sixteen cultivars of perennial ryegrass. The Czechoslovakian collection had the highest level of infection on twelve of the cultivars, although with most cultivars there were no significant differences in infection levels. Three cultivars, although with most cultivars there were no significant differences in infection levels. Three cultivars, Kerem, Loret, ta and Tando, contained qualitative resistance to crown rust which was overcome by the Czechoslovakian collection, although they retained a moderately high level of background resistance to this collection.