Search for: [Subject and Keywords = Nematologia] OR [Subject and Keywords = Nicienie \-\- pasożyty roślin] OR [Subject and Keywords = Nicienie \-\- systematyka] OR [Subject and Keywords = Nematoda] OR [Subject and Keywords = Helicotylenchus] OR [Subject and Keywords = Rotylenchus] OR [Title = Problems concerning the genera Helicotylenchus Steiner, 1945 and Rotylenchus Filipjev, 1936] OR [Creator = Geraert, E.]