In the years 1997-1999 the occurrence of ryc diseases in the region of south-western Poland was investigated on rye varieties Warko, Dańkowskie Złote and hybrid rye Marder. Eyespot (Pseudocercosporella herpotrichoides var. acuformis) and brown rust (Puccinia recondita) occured most frequently in the experimental period. Fusarium stem base rot and leaf blight iFusarium spp.) and leaf scald iRhynchosporium secalis) were occasionally of considerable importance, but their occurrence was usually less frequent. Variety Marder showed high susceptibility to stem base and leaf diseases, especially to brown rust. When one treatment with fungicides was applied, grain yield increase of cv Marder reached the value of 20,03% in conditions of high infection by pathogens. It was concluded that in the years favourable for the development of diseases on ryc, chemical control with broad-spectrum fungicides might be advisable, especially for protecting susceptible varieties.