Eutypella parasitica, povzročiteljica javorovega raka, uničujoče bolezni javorjev v Evropi in Severni Ameriki, najpogosteje okuži deblo gostitelja skozi odmrle veje ali rane v skorji. Zaradi morebitnega vpliva glivne združbe na okužbo in rast E. parasitica smo proučili vrstno sestavo gliv v lesu odmrlih vej gorskega javorja (Acer pseudoplatanus). Glive smo izolirali v čiste kulture iz različnih mest v odmrli veji. Najpogosteje smo izolirali Eutypa maura, Eutypa sp., Fusarium avenaceum, Neocucurbitaria acerina in E. parasitica. Ugotovili smo neznačilne razlike v pestrosti glivnih vrst in značilne razlike v glivnih združbah med različnimi lokacijami, med različnimi mesti izolacije in med različnimi debelinami vej. Analizirali smo vpliv najpogostejših vrst gliv v lesu odmrlih vej gorskega javorja na rast E. parasitica v čisti kulturi in s testom mini-blok ugotavljali njihov vpliv na razkroj lesa naših najpogostejših vrst javorjev. Na podlagi izračuna antagonističnega indeksa in uspešnosti reizolacij iz interakcijske cone smo E. parasitica šteli za šibkejšo tekmovalno vrsto. Izolati Eutypa sp., Eu. maura, Neonectria sp. in Peniophora incarnata so se izkazali za najučinkovitejše inhibitorje E. parasitica, ki bi jih lahko potencialno uporabili tudi za zatiranje E. parasitica. S testom mini-blok smo ugotovili relativno počasen razkroj lesa zaradi delovanja E. parasitica. V primerjavi z izolatoma znanih trohnobnih gliv je povzročila značilno manjše izgube mase. Na podlagi mikroskopije in obarvanja vzorcev sklepamo, da E. parisitica povzroča belo trohnobo. Z raziskavo smo podrobneje raziskali določene lastnosti E. parasitica in pri tem odprli številna nova vprašanja. Eutypella parasitica, the causative agent of Eutypella canker of maple, a destructive disease of maples in Europe and North America, most frequently infects the trunk through a branch stub or bark wound. Because the fungal community may have an impact on infection and colonization by E. parasitica, we examined the species composition of fungi colonizing the wood of the dead branches of sycamore maple (Acer pseudoplatanus). Isolations were made from different isolation sources in a dead branch. The most frequently isolated species were Eutypa maura, Eutypa sp., Fusarium avenaceum, Neocucurbitaria acerina, and E. parasitica. We did not detect differences in species diversity, but fungal communities differed between sampling sites, between isolation sources, and between branch thickness classes. We tested the most frequently isolated fungi from the wood of dead branches of sycamore maple in dual cultures with E. parasitica and determined their effect on wood decay in our most common maple species using a mini-block test. Based on the calculation of an index of antagonism and re‐isolation success from the interaction zone, we consider E. parasitica to be a weak competitor. Eutypa sp., Eu. maura, Neonectria sp., and Peniophora incarnata have been shown to be the most effective inhibitors of E. parasitica. Relatively slow wood decay due to the action of E. parasitica was detected by the mini-block test. Compared to isolates of known decay fungi, it resulted in significantly lower weight loss. Based on microscopy and staining of the samples, we conclude that E. parasitica could be considered to cause white rot. We have examined certain areas of E. parasitica biology and raised several new questions.