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African Journal of Food, Agriculture, Nutrition and Development
Rural Outreach Program
ISSN: 1684-5358
EISSN: 1684-5374
Vol. 9, No. 8, 2009, pp. 1652-1666
Bioline Code: nd09093
Full paper language: English
Document type: Research Article
Document available free of charge

African Journal of Food, Agriculture, Nutrition and Development, Vol. 9, No. 8, 2009, pp. 1652-1666

 en Fungitoxic Properties Of Four Crude Plant Extracts On Fusarium oxysporum check for this species in other resources Schl. F. sp Phaseoli
Obongoya, BO; Wagai, SO & Odhiambo, G

Abstract

Fusarium yellows is a disease of common beans ( Phaseolus vulgaris check for this species in other resources ,L.) caused by Fusarium oxysporum check for this species in other resources Schl. F. sp phaseoli , it has been found to be important in Busia district of Western province, Kenya. The study on fungitoxic properties of four locally available crude plant extracts was aimed at evaluating their efficacy in controlling Fusarium yellows infestation under the field conditions. Crude plant extracts from Azadirachta indica check for this species in other resources , Tagetes minuta check for this species in other resources , Nicotiana tobacum check for this species in other resources and Vinca rosea check for this species in other resources were tested against Fusarium oxysporum Schl. F. sp. phaseoli. Participatory On-Farm Trials (POFT) in six (6) divisions were carried out in August-September 2005 and March-June 2006; a total of thirty (30) farms were randomly surveyed. Minimum Inhibitory Concentration (MIC) of crude plant extracts against Fusarium was determined by broth microdilution method. Analysis of variance (ANOVA) was performed on the data, using Genstat 8th edition statistical program (Release 8.11, Lawes Agricultural Trust, Rothamsted Experimental Station, Harpenden, UK). Means were separated using LSD. Crude plant extracts exhibited fungitoxic activity against Fusarium oxysporum Schl. F. sp. phaseoli, with varying degree of efficacy. Nicotiana tobacum and Vinca rosea were not effective, Azadirachta indica and Tagetes minuta exhibited significant control over Fusarium. Azadirachta indica performed better amongst all the plant extracts. Common bean treatment with Benomyl 1 significantly reduced (P≤0.05) wiltincidence and increased growth in comparison to negative (–ve) control. Azadirachta indica formulation gave a significant reduction in wilt incidence compared to the other three crude plant extracts formulations. It reduced the wilt incidence by 17.24% in comparison to Tagetes minuta, Nicotiana tobacum and Vinca rosea whose wilt incidence reduction ranged from 5.84-9.8%. Azadirachta indica inhibited Fusarium growth at lower dosage than Tagetes minuta, Nicotiana tobacum and Vinca rosea. Extracts from Azadirachta indica and Tagetes minuta are effective, cheap and ecofriendly promising methods for protecting common bean against Fusarium oxysporum Schl. F. sp. phaseoli.

Keywords
Ecofriendly, Efficacy,Plant extracts, Fusarium oxysporum

 
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