Systemic effect of microbial preparations on causative microorganisms of bacterial diseases of tomato plants

Abstract

Biologicals Phytohelp, Phytocide and Ekstrasol, based on the bacteria Bacillus subtilis, showed  different antibacterial activity to phytopathogens, due to the peculiarities of used strains, cells titer and concentration of biologically active products of microorganisms. Biologicals Phytohelp and Phytocide showed high antibacterial activity against the agents of bacterial cancer C.  michiganensis subsp. michiganensis and bacterial  black spotting X. vesicatoria, and the no growth zone diameter ranged from 73 to 80 mm. Under these conditions no growth zone diameter of the studied strains C. michiganensis subsp. michiganensis and X. vesicatoria for  microbiological preparation Ekstrasol did not exceed 40 mm. Among these preparations more active against bacterial speck of tomatoes P. syringae pv. tomato was microbial preparation Ekstrasol no growth zone diameter of which was 23±3.0 mm. Biological Azotofit, based on cells of nitrogen-fixing bacteria Azotobacter chroococcum, showed high antibacterial activity against the agent of bacterial cancer C. michiganensis subsp.  michiganensis, no growth zone diameter was 78±2.0 mm. This preparation was middle-active against the agent of bacterial black spotting X. vesicatoria and showed no activity against the agent of bacterial speck of tomato P. syringae pv. tomato. It was revealed that the most active against the agents of bacterial black spotting and bacterial cancer are biologicals Phytocide and Phytohelp, based on the bacteria Bacillus subtilis that are recommended by us for use in the manufacture.