EN
Research on the usefulness of fungi from Neotyphodium genus for perennial ryegrass and meadow fescue protection against chosen pathogens was conducted. Neotyphodium lolii and N. uncinatum endophyte isolates showed antagonistic activity towards 11 out of 12 tested pathogens in dual-culture assays. No effect of Neotyphodium spp. isolates towards Microdochium nivale in vitro was stated. Fusarium equiseti was the most often inhibited fungus by N. lolii. All the N. uncinatum isolates inhibited growth of Fusarium avenaceum and Rhizoctonia cerealis. Perennial ryegrass and meadow fescue genotypes settled by Neotyphodium spp. were significantly protected against 87.5% of test pathogens in the pot experiments. All the studied associations were susceptible to Fusarium equiseti infection. Endophytes served as the best protection against Bipolaris sorokiniana, Rhizoctonia solani, Drechslera sp., Gaeumannomyces graminis and Fusarium poae in most cases.