Abstract
Field studies were conducted in 2006 and 2007 to investigate the reaction of 10 varieties of kenaf (Hibiscus cannabinus) to natural infestation of Meloidogyne incognita. Ten weeks after planting, 10 randomly selected plants per variety were assessed for root galling. Data were also collected on plant height, stem girth, days to maturity, number of seeds and seed yield. Gall index and nematode reproduction factor varied significantly among the kenaf varieties. AU 64 recorded the tallest height of 2.4 and 2.3 m, respectively, in 2006 and 2007 cropping seasons followed by Ex-Funtua, Ifeken 100 and G 45 whereas the lowest height was recorded for Ifeken 400 and Cuba 108. Days to maturity ranged from 120 to 135 days. Based on gall index ratings, AU 64, Ex-Shika, Ex-Giwa, G45, and the local variety were susceptible to M. incognita. Tianung 1 and Cuba 108 were very susceptible, whereas Ifeken 100 and 400 were resistant. Based on reproduction factor, AU 64, Ex-Shika, Ex-Giwa, G 45, Ex-Funtua and the local variety supported greater nematode reproduction and were good hosts of root-knot nematodes. Tianung 1 and Cuba 108 were very susceptible while Ifeken 100 was a poor host of M. incognita.
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