The presence of pathogenic fungi at each stage of plant development may cause a reduction in grain quality and significant losses in yield. The aim of the presented study was to compare the population of the most commonly pathogens causing diseases of stem base of wheat in two important wheat-growing regions: in the Wielkopolska Province and the Warmia-Mazury Province. The material designed for investigating was collected in 2007–2008 and came from randomly chosen locations, most of which were individual farmlands. In order to identify pathogens, fragments of plants were taken (stem base) with symptoms of infestation by pathogenic fungi. Among the isolates obtained 66% constituted fungi of the genus Fusarium. But dominant pathogen in Wielkopolska was Rhizoctonia cerealis. Differences were found in populations of fungi on stem base of wheat in the explored areas.
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