The effect of Bacillus coagulans No. 6 strain, B. circulans No. 1, 7, 8 strains and Propionibacterium on growth of Alternaria radicina on carrot tap root was estimated in the research. Investigations were carried out in two terms. In the first test, black rot lesions on carrot tap roots were significantly reduced in size when roots were treated with Propionibacterium, Bacillus coagulans No. 6 and B. circulans No. 1, 7, 8 strains. In second test only insignificant level of fungistatic activity of all tested bacteria was observed.