| Summary: | The populations of parasitic nematodes colonizing the rhizosphere of Helianthus tuberosus L. grown in Polish plantations were studied in the summer of 2016 and the spring of 2017. A total of 35 nematode species were identified: Paratrichodorus pachydermus, Trichodorus cylindricus, T. viruliferus, Longidorus attenuatus, L. elongatus, L. leptocephalus, Criconema annuliferum, Criconemoides informis, Mesocriconema rusticum, M. solivagum, M. xenoplax, Paratylenchus nanus, P. neoamblycephalus, P. projectus, Bitylenchus dubius, B. maximus, Merlinius brevidens, M. nothus, Scutylenchus quadrifer, S. tartuensis, Helicotylenchus digonicus, H. pseudorobustus, H. vulgaris, Rotylenchus pumilus, R. robustus, Pratylenchus crenatus, P. fallax, P. neglectus, Hirschmanniella gracilis, Aphelenchoides fragariae, Aphelenchus avenae, A. eremitus, Ditylenchus dipsaci, and D. medicaginis. Aphelenchoides fragariae and Ditylenchus dipsaci could be foliar pathogens of H. tuberosus L. This is the first study to demonstrate the presence of A. fragariae on the leaves of the Jerusalem artichoke in Poland. The frequencies of occurrence and population densities of the 35 nematode species were determined.
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