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The aim of this work was to investigate the ability of the SA to inhibit the growth of strains of Xanthomonas vesicatoria, Pseudomonas syringae pv. tomato and Clavibacter michiganensis subsp. michiganensis in nutrient media and suppress the development of bacterial black spot, bacterial spotting and bacterial cancer in tomato plants in terms of artificial infection. Methods. Virulence of strains of X. vesicatoria, P. syringae pv. tomato and C. michiganensis subsp. michiganensis in laboratory environment was determined by artificial infection of stalks and leaves of tomato plants by injection. Accounting of strains aggression was carried out using the 10-point scale. SA on bacteria was studied by perforation method. Result. The author has established antibacterial effect of salicylic acid on the pathogens of tomato bacterial cancer, black bacterial spot and bacterial spotting in the medium, and its potential possibilities of disease inhibition in terms of artificial inoculation. It is established an authoritative increase in areas of stunted growth of pathogen strains with salicylic acid in proportion with the increase of its concentration. SA application has reduced the degree of development of tomato bacterial diseases by 8–65 % in terms of the artificial inoculation. Spraying tomato plants with SA solution was more effective than root soaking. Conclusions. SA solutions showed high antibacterial activity against pathogens of bacterial cancer C. michiganensis subsp. michiganensis and bacterial black spot X. vesicatoria with no growth zone of 70–80 mm. Increased SA concentrations caused the increased effectiveness of inhibition of tomato plants bacterial diseases Author Biography Yulia Kolomiets, National University of Life and Environmental Sciences of Ukraine Geroyiv Oborony str., 15, Kyiv, Ukraine, 03041 PhD, Associate Professor Department of environmental biotechnology and biodiversity

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