This work contains an estimation of ten Perennial ryegrass cultivars as regards dry matter yields and resistance to diseases. The highest dry matter yields were collected during the first period of the study, the smallest — during the second year. Average difference between those years amounted to 40.7% due to a lower level of rainfall in the second year of the investigation. The highest total dry matter yield for three years was collected with Anna (36.5 t ha-1) and Montagne (34.5 t ha-1) cultivars and the lowest with a Respect cultivar (30.1 t ha-1). Stalk rust (Puccinia graminis), helmintosporium (Drechslera ssp.) as well as powdery mildew (Erysiphe graminis DC.) infections were observed only during the first year of investigation between the forth and fifth cutting. Infection with pink snow mould occured only during the second and the third year of study.
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