The aim of this work was to determine the impact of bacterial isolates Tx and Ux (of two kinds) from spontaneous fruit-berry fermentation upon fungal disease agents from the genera Alternaria and Fusarium. The disease agents were isolated from various ornamental plants growing in the city greenery. The killer activity of bacterial isolates is determined by the ability of the test strains to form lysis zones on the lawns of the test a' S. cerevisiae strain and plant disease agents. S. cerevisiae standard K7, Rom-K100, M437, MS300 killer strains were used as a control. It has been previously demonstrated that the toxins produced by Tx and Ux bacterial isolates are able to destroy not only yeasts of the genus Saccharomyces but also of the genera Candida, Kluyveromyces as well as such plant disease agents as Verticillum albo-atrum and Venturia ineaqualis. Tests of the impact of these toxins upon fungi of the genera Alternaria and Fusarium revealed the highest killing activity during the intensive growing stage on the YEPD and MB media (pH 4.8) at a temperature of 20–30 °C. The obtained results could be employed Hile elaborating new and efficient plant protection measures.

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