The diploma thesis introduces and researches tree health on the Radovljica forest educational trail. The purpose of the thesis was to determine and identify the fungi that cause diseases in tree and shrub species. At the same time, we wanted to study and describe them, and provide sanitary measures on the basis of obtained data. At the end of May 2018, samples of diseased plant parts were collected on the Radovljica forest educational trail. Samples were identified with the help of phytopathological literature, identification keys and microscopy at the Slovenian Forestry Institute, tree pathogens were identified as well. 11 species of fungi have been identified. It was difficult to identify tree pathogens of some trees, since fungi carpophores were not formed on leaves or needles.
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