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Comparative evaluation of the effect of plant products on the rhizosphere population of Fusarium oxysporum f. sp. lycopersici and the growth of tomato plants.
G. C. VAN DER PUIJE (1), S. R. Gowen (2), A. N. Jama (2). (1) University of Cape Coast, Cape Coast, Ghana; (2) Department of Agriculture, University of Reading, Reading, United Kingdom

A study was conducted at the glasshouse at the University of Reading, U. K. to compare the efficacy of aqueous extracts of <i>Icacina senegalensis</i> tuber (IcT), <i>Khaya senegalensis</i> bark (KhB) and <i>Azadirachta indica</i> leaves (NmL) using <i>Fusarium oxyporum</i> f. sp. <i>lycoperscici</i> (<i>Fol</i>) as the pathosystem. The extracts were prepared at 0, 50, 100, 150, and 200 g/L and applied to 3-week old tomato seedlings inoculated with <i>Fol</i>. The design was a randomised complete block factorial with 3 replications. KhB and NmL were significantly better than IcT at all the concentrations applied. KhB and NmL were similar at 50 to 150 g/L in reducing the rhizosphere population of <i>Fol</i>. Disease severity significantly reduced with increasing concentration except in IcT. Plant growth, measured as plant height, shoot weight and root weight, was severely reduced by IcT suggesting a phytotoxic effect. While there were no deaths in plants treated with KhB and NmL, mortality in plants treated with IcT at 50, 100, 150 and 200 g/L was, 11%, 30%, 33% and 50%, respectively. KhB and NmL were comparatively better than IcT in managing <i>Fol</i> and had a milder effect on plant growth. While plants can be a good source for managing plant diseases the study suggests the need for caution in their use.<p><p>Keywords: Fungus, Vegetables, Tomato

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