INCIDENCE AND DISTRIBUTION OF NEMATODES IN YAM INTERCROP FIELDS IN YEWA NORTH LOCAL GOVERNMENT OF OGUN STATE, NIGERIASosanya O.S. and Yusuf F.
Plant-parasitic nematodes distribution and abundance in soils of Yewa local government area of Ogun State was carried out in yam intercrop fields. Four top yam producing villages: Igan Okoto, Joga Orile, Ijako Orile and Saala Orile were identified and four farms were randomly selected in each area (i.e 4 locations X 4 farms = 16 farms), where twenty soil samples were collected, bulked and mixed thoroughly together from each farm after which five sub soil samples (representative samples) were drawn thus giving a total of eighty (80) sub soil samples. Samples were arranged in a completely randomized design and means separated by duncans multiple range test. Whitehead and Hemming (1965) tray method was adopted for the extraction of nematodes. The total population densities of all the nematode genera discovered was 25,811. Ijako Orile had the highest population densities of 12,233 with Meloidogyne, non-parasitic types and Scutellonema having higher percent populations of 27.3%, 25.87%, and 20.93% while Pratylenchus, Rotylenchus and Helicotylenchus had the least percent populations of 11.76%, and 5.95% respectively. Both Igan Okoto and Joga Orile had moderate population densities of 6,505 and 6,064 in the ascending prevalent order of Helicotylenchus, Rotylenchus, Pratylenchus, Scutellonema, non-parasitic and Meloidogyne while Saala Orile had the least population density of 1,009 .
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