The investigations were carried within the meadow agrocenoses, located in the valley of the Warta Landscape Park, between Dolany and Ląd. Different disease symptoms occurring on plant organs of Cirsium arvense such as leaves, shoots and roots were recorded. Dying of inflorescences and infructescences and sometimes dying of the whole plant, as well as damages caused by pests were also observed. Alternaria spp., Epicoccum spp. and Fusarium spp. were the most isolated species from spots, shoots and infructesences. Coniothyrium and Epicoccum were also often isolated from leaves while Acremonium, Phomopsis, Phoma and Sclerotinia sclerotiorum were cultured from the basis of shoots and roots. It was determined that plants of C. arvense were sick on all observed sites, however disease severity depended on location and age of the plants. Lower pathogen infections of C. arvense were detected within populations with majority of young plants. In July and August powdery mildew (Oidium spp.) and rust (Puccinia punctiformis) were dominating on them, while in the older populations leaf spot diseases and dying of inflorescences and infructescences were observed. Pathogens of C. arvense were considered as potential active substances of bioherbicides.
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