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An experiment to determine the effects of lemon grass, Andropogon citratus L. extract on the rootknot nematodes (Meloidogyne spp.) of okra was conducted. Phytochemical analyses of the bioactive ingredients in lemon grass were carried out to determine the chemical compounds with nematicidal activities present in lemon grass. Okra (var. Clemson 40) was planted in twenty four (24) experimental pots containing 5kg steam-sterilized loamy soil. Each plant stand was inoculated with 30ml of root-knot nematode egg suspension containing approximately150 eggs/ml. A set of 4 pots were left un-inoculated (control). The lemon grass extracts were 0, 25, 50, 75 and 100% concentrations. Two control trials were used: nematode uninoculated and untreated with leaf extract as control 1 and nematode inoculated but not treated as control 2. Each treatment was replicated four times. The experimental design was a completely randomized type. The result of the phytochemical screening showed that lemon grass contained tannins, alkaloids, flavonoids and saponins. The result of the pot trials showed that lemon grass extract significantly (P |
