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This article cites a study that determined the species of Rhynchosporium (R.) occurring on Lolium (L.) multiflorum, their relative frequency, and the host range of common isolates. The variation between and within cultivars was assessed with a view to increasing the level of resistance in L. multiflorum by breeding. R. orthosporum was isolated from L. multiflorum from breeders' plots at Aberystwyth, Wales twice as often as R. secalis. Of 20 genotypes of L. multiflorum, 17 ranked similarly for level of resistance to both pathogen species.