The purpose of this thesis is to recognise, describe and study the possibilities of combating the phytopathogenic fungi infecting woody plants onthe nature trail Planina - Mirna gora. The diseased parts of the plants were collected on and in the vicinity of the nature trail and the pathogens were successfully identified with the help of phytopathological literature. The samples of the identified diseases have been preserved in the mycological collection of the Slovenian Forestry Institute. There have been detected 20 pathogens on the forest trees. 17 common and widely spread pathogenic fungi have been detected and three species of alien invasive fungi have been found (Erysiphe flexuosa, Chalara fraxinea and Mycosphaerella pini). Not all the examined damaged trees had signs of fungal infection, therefore it is assumed that the causes for these tree damages are pests or harmful abiotic agents.
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