Abstract
Nine herbal powders were tested against root-knot nematode, Meloidogyne incognita (Kofoid and White) Chitwood (Tylenchida: Meloidogynidae) under greenhouse conditions. The herbal powders were collected from Gezira State, Sudan. Herbal powders were used without extraction to simplify the application by farmers. Most of the herbal powders were effective in controlling M. incognita in the soil compared to the control. Some treatments (e.g., Acacia nilotica (L.), Argemone mexicana L., and Azadirachta indica A. Juss) had statistically lower Root Knot Index (RNI) than the control. The number of juveniles per 100 g soil was lower in soil amended with Dinbera retroflexa (Vahl), Azadirachta indica, Salvadora persica (L .), and Acacia nilotica than in unamended soil. The results of both RNI and number of juveniles were not significantly different from the synthetic nematicide used. Herbal powders from A. indica and Acacia nilotica may be promising in controlling of this pest because they are readily available to farmers in tropical regions.
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