This paper deals with the resistance of twenty commercial winter wheat cultivars to common bunt causal agent (Tilletia tritici). Significant differences among the cultivars concerning the infection percent were observed, as well as the differences in the level of commercial cultivars' resistance to T. tritici. Most of the studied cultivars belonged to susceptible categories, and just few of them to the resistant ones. Cultivar Lasta was classified as highly resistant during the both investigation years in Kragujevac, while in Leposavić Lasta and Tiha were classified as resistant. The other studied cultivars were more or less susceptible

This paper deals with efficiency of some Pc genes of resistance to pre valent pathotypes of crown rust causer in oat. It was found that in seedlings stage the most efficient were genes Pc 68 and Pc 39 (100%). Satisfying degree of efficiency demonstrated genes Pc 38 and Pc 55 (87,5%). Majority of genes expressed partial resistance. Efficiency of Pc genes of resistance to prevalent pathotypes of pathogen in both years of investigation was satisfying and it was 61,45%