The paper presents results of studies on the occurrence and economic importance of maize diseases: common smut tUstilago teae /Beckm./Unger) root et stalk rot iFusarium spp.) and eye spot of leaves (Kabatiella zeae Narita et Hiratsuka) (conducted in 1993-1999) as well as com rust tPuccinia sorghi Schw.) and blotch of leaf sheaths (Pseudomonas andropogoni E. F. Smith/Stapp., P syringae van Hall.) (conducted in 1996-1999).