Abstract
Alternaria blights caused by microscopic fungi of the Al-ternariagenus are widespread diseases of crops and or-namental plants. Russian and foreign scientists take an active part in developing biological products based on an-tagonistically active microorganisms. However, the situa-tion regarding Alternaria blight is still unfavorable. The re-search goal was to study the antifungal activity of the ge-nus Bacillusstrains against the phytopathogen Alternaria sp. The agar block method was used to determine the an-tagonistic activity of 8 rhizospheric bacilli strains (B. pu-milus4, B. pumilus5, B. pumilus6, B. pumilus7, B. licheni-formis8, B. licheniformis9, B. licheniformis10, and B. pu-milus16). All investigated strains showed themselves as antagonists in relation to Alternaria. On the 14th day of the experiment, the diameter of the Alternaria sp. in the control was 85.83 ± 8.78 mm. The following values of the phyto-pathogen mycelium diameter were recorded in dishes with bacilli: B. pumilus4 -10.00 ± 0.87 mm, B. pumilus 5-12.17 ± 0.76 mm, B. pumilus 6-11.33 ± 1.26 mm, B. pu-milus7 -8.00 ± 3.00 mm, B. pumilus16 -7.67 ± 0.29 mm. Alternariasp. did not grow beyond the 5 mm diameter block with all B. licheniformisstrains. Bacteria of the B. licheniformisspecies had a more pronounced antifungal effect (100%) than the B. pumilusstrains (91.13-96.70%). B. licheniformis8, 9, 10 and B. pumilus16, 7, 4 strains are primarily recommended for inclusion in a biological plant protection product against Alternariablight
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