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Management of root-knot nematode (Meloidogyne spp.) on okra (Abelmoschus esculuntus (L.) Moench) with aqueous sesame seed extract

Frederick Kankam, Elias Nortaa Kunedeb Sowley, Mohammed Alhassan

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Int. J. Agron. Agri. Res.6(4), 24-31, April 2015


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Okra (Abelmoschus esculuntus (L.) Moench) is a popular vegetable in Ghana but its production is limited by nematode infestation of soils. Pot experiments were carried out in a plant house at the Nyankpala campus of the University for Development Studies (UDS), Tamale to assess the effect of aqueous sesame seed extract on root-knot nematodes (Meloidogyne spp.) of okra. The experiment was laid out in a completely randomized design with each of the four treatments replicated four times. Treatments consisted of three levels of sesame seed extract (10, 20 and 30 g/50ml) per pot and a control (0 g/50ml). All pots were inoculated with 1000 root-knot nematode eggs a week before the application of the treatments. Data collected included plant height, number of leaves, stem girth, fruit weight, fresh root weight, number of fruits, nematode eggs per 50 g of fresh soil and root galling index. The results showed that aqueous extract of S. indicum at 30 g/50 ml (w/v) suppressed root-knot nematodes better than the control. Similarly, okra plants treated with S. indicum had the lowest infection index (root gall). There were significant differences (P<0.05) among the treatment means for number of fruits and fruit weight of okra between aqueous sesame seed extract at 30 g/50 ml and the control. Yield of okra can be enhanced and nematode population reduced through the application of sesame seed extract preferably at 30 g/50ml


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