The external appearance and quality of table potatoes are determined, among other factors, by the health status of the plants
during the growing season. Chemical control methods are often combined with biocontrol agents to effectively fight potato pathogens.
Potatoes of the very early cultivar Rosara were grown in experimental plots. The plots were located in Tomaszkowo (NE Poland,
2007–2009). The experiment involved the following treatments: 1) biological control − mycorrhizal Glomus spp. inoculum was applied
to the roots, − tubers were dressed and plants were sprayed with Polyversum three times during the growing season, 2) chemical
control – at two-week intervals, plants were sprayed with the following fungicides: Infinito 687.5 SC and Tanos 50 WG, Valbon 72
WG and Tanos 50 WG. In the control treatment, potato plants were not protected against pathogens. During the growing season, the
severity of late blight and early blight was evaluated on a nine-point scale. The composition of fungal communities colonising potato
stems was analysed. The fungistatic properties of the fungicides used in the field experiment were evaluated in an in vitro test. The
symptoms of infections caused by Phytophthora infestans and Alternaria spp. were significantly reduced in the treatment which used
the integrated chemical and biological control. The least diverse fungal community was isolated from fungicide-treated plants. In the
in vitro test, fungicides at all analysed concentrations inhibited the linear mycelial growth of selected pathogens.
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