The antagonistic activity of 23 strains of micromycetes belonging to different taxonomic groups, against phythopathogenic bacteria and fungi was studied. The antagonistic activity of the micromycetes was tested by agar diffusion (the method of blocks). For the determination of the influence of the micromycetes on plants, spring barley seeds were treated by cultural liquid of fungi (dilution 1 : 10) for 24 hours and germinated in Petri dishes on moist filter paper. Two strains Trichoderma longibrachiatum 17 and T. lignorum 14 showed the highest antagonistic activity against the phytopathogenic bacteria and fungi. T. longibrachiatum 17 actively suppressed the growth of fungi
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