Surveys carried out in the Batinah, Dhahira, Dhofar Governorates, and the Interior and Sharqia regions of the Sultanate of Oman during 1991-1996 revealed the presence of thirteen genera of plant parasitic nematodes associated with alfalfa. Prarylenchus spp. were the most common nematodes and were found in 61 % of sampIes, followed by Meloidogyne spp., Tylenchorhynchus spp., Helicotylenchus spp., and Rorylenchulus renijormis. The population fluctuations of Pratylenchus jordanensis were studied on alfalfa at rwo locations at Rumais in the Batinah region during 1994-1995 and 1995-1996, respectively. A positive correlation (P:::: 0.0 1) berween nematode populations in roots and soil temperature was observed. The nematode population in roots was highest from July to November and lowest from December to June.

Surveys carried out in the Batinah, Dhahira, Dhofar Governorates, and the Interior and Sharqia regions of the Sultanate of Oman during 1991-1996 revealed the presence of thirteen genera of plant parasitic nematodes associated with alfalfa. Prarylenchus spp. were the most common nematodes and were ...