EN
Research on the possibilities of use of NC11 Neotyphodium coenophialum isolate as a biological control agent was conducted. The highest mycelium growth inhibition of Drechslera sp., Bipolaris sorokiniana, Fusarium equiseti, Gaeumannomyces graminis, Microdochium nivale and F. avenaceum by endophyte isolate in dual culture assay was recorded at 30°C. The highest width of growth inhibition zone (5 mm) was detected for Drechslera sp. A significant effect of the endophyte presence on tall fescue infection by B. sorokiniana and F. avenaceum was stated in a pot experiment. Endophyte infected plants were healthier than E−. There was no effect of endophyte presence on tall fescue infection by Drechslera sp. and F. equiseti.