White water lily Nymphaea alba L. is very popular among enthusiasts for aquatic plants cultivation in ponds. The decorative values are provided by magnificent flowers and attractive floating leaves. The aim of the study was to determine the health status of white water lily, and identificate of mycobiota accompanying those plants in the growing season, and thus causing symptoms of disease. The studies were carried out in twenty ponds, in 2006, 2008–2010. It was found that spots and necrosis of leaves were caused by complex of fungi and chromistan fungi from genera: Alternaria, Aspergillus, Cladosporium, Cylindrocarpon, Fusarium, Mortierella, Mucor, Paecilomyces, Penicillium, Phialophora, Phoma, Phytophthora, Pythium, Sordaria, Trichoderma and others. White water lily plants often were colonized by Alternaria alternata, Penicillium verrucosum v. verrucosum, P. expansum, Paecilomyces farinosus, Cylindrocarpon destructans, Sordaria fimicola, Mucor hiemalis f. hiemalis and Fusarium oxysporum. Fungi colonized the most intensively white water lily in the autumn. It was also ascertained, that since pathogenic fungi and chromistan fungi infected white water lily, such complexes brought about a range of spotting symptoms up to leaves necrosis, on account of what has taken place sharp decrease of plants aesthetic value.

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