Abstract:
A survey was conducted to investigate nematode biodiversity in three major potato growing areas, Aybasti, Kabatap and Korgan districts of Ordu province of Turkey in 2010. In the survey, a total of 24 soil samples were collected from potato fields belonging to these areas where the native ecotypes called Aybasti Beyazi and Aybasti Sarisi occur. The analysis of the soil samples collected from the rhizosphere of potato revealed the presence of 25 nematodes taxa belonging to different trophic groups. Nine genera of plant parasitic group, 2 families and 9 genera of bacterivorous group, 3 genera of fungivore group, one genus of predator group and one order of omnivore group were allocated. The incidence and the abundance of the nematodes varied among the three areas. Pratylenchus and Tylenchus sp., seem to be the most widespread plant parasitic genera because they were both frequent on the potato throughout the three regions. Meloidogyne was found only in a sample of Korgan district with a 720 J2s abundance. The other taxa found were Helicotylenchus, Geocenamus, Paratylenchus, Psilenchus, Filenchus, Meloidogyne, Tylenchorhynchus, Rhabditidae, Monhysteridae, Cephalobus, Eucephalobus, Acrobeloides, Chiloplachus, Cervidellus, Acrobeles, Wilsonema, Plectus, Tripyla, Aphelenchoides, Aphelenchus, Ditylenchus, Mononchus sp. and Dorylaimida. Plant parasitic nematodes except Pratylenchus sp. were not found to be very wide-spread and abundant in the province. On the other hand, free-living nematodes which were considered to be the indicators of soil heath were found divers and abundant.