Some extreme values of Granek´s ratio, number of ridges, vulva-anus distance and stylet length from Gojna Gora were closer to G. rostochiensis than to G. pallida. This could be why the Gojna Gora population is described as G. rostochiensis by Krnjaic et al. (2006). The PCR method avoided such ambiguities in nematode diagnostics. There are some other advan tages of PCR and used reagents.