Abstract
Tithonia is increasingly grown in Poland as a decorative plant, mainly on rebates in urban plantings, but also in allotment and backyard gardens. The aim of the research was to evaluate the decorative qualities and healthiness of T. rotundifolia in urban plantings. The investigations were carried out in 2014 near Lublin. The studies included plants grown in Botanical Garden UMCS (Lublin), and Allotment Gardens “Elizówka”. Plant growth, flowering process and decorative qualities were assessed. The observations of diseases were carried out at the end of the vegetation period. After the estimation of health status, the seeds, roots, stems and leaves with disease symptoms were collected for further mycological analysis. The isolates of fungi belonging to eleven genera were obtained from dead parts of plants. Among them the dominant (popular and dangerous in weather conditions of Poland) were genera known from their pathogenicity toward T. rotundifolia: Alternaria alternata and Botrytis cinerea.
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