Rhododendrons of evergreen leaves and rhododendrons of falling leaves (azaleas) are the most shrubs cultivated in modern gardens. Their values are not only decorative flowers but also leathery and glossy leaves. In a number of specimens during the vegetation season on leaves are visible blotch and necrosis, leading to their premature falling. Research was conducted in three successive vegetation seasons in gardens and parks in Malopolska. The object of research were the fallen leaves of rhododendrons and azaleas. For the mycological research 1500 infected leaves fragments was taken, and mycological isolation was performed according to standard methods used in phytopathology. From the fallen leaves of rhododendrons 1300 colonies of fungi, and from azaleas 1777 colonies respectively were isolated. Most frequently were isolated Alternaria alternata, Pestalotia sydowiana, P. truncata and Epicoccum purpurascens and fungi of the genera: Aspergillus, Fusarium, Mortierella, Penicillium, Phoma and Trichoderma.

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