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Effects of three aqueous plant extracts in the control of fungi associated with post-harvest rot of yam (Dioscorea alata)

By: Assiri Kouamé Patrice, Koutoua Séka, Yao Kouassi Francis, Assi Serge Théophile, Fofana Fatoumata, Hortense Atta Diallo

Key Words: Fungi, Plant extract, Post-harvest, Rot, Yam.

Int. J. Agron. Agri. Res. 11(3), 77-87, September 2017.

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Yam is the first food crop in Cote d’Ivoire. However yam postharvest losses due to fungi especially at storage are a major challenge. The use of chemicals has helped but the constant use can induce resistance of organisms. Biological method of control has been preferred in some cases because it is selective with no side effect and cheap. The objective of this work was to evaluate the effect of three aqueous plant extracts in the control of two fungi associated with post-harvest rot of yam. Aqueous plant extracts of Aframomum melegueta leaves, Ricinus communis seeds and Zingiber officinale rhizome on mycelial growth of Aspergillus niger and Penicillium oxalicum isolated on yam (Dioscorea alata) at different concentrations (150, 200, 250 et 300 g/L) were investigated. The ability of plants extract to protect yam tuber was also study. Our findings showed that the three plant extracts at various concentrations inhibited the mycelial growth of the two fungi in vitro. However, the inhibitory effects of the plant extract of R. communis increase with the higher concentrations. The mycelial inhibition percentage caused by A. melegueta, Z. officinale and R. communis ranged respectively from 11.63%-17.5 %; 44.57%-46.79%; 85.36%-100% for A. niger. For P. oxalicum, it ranged respectively from 72.91%-79.7%; 94.4%-96.8% and 89.72%-100%. In yam, the plant extracts used showed antifungal activity on the two isolated fungi. The extract of R. communis showed interesting potential for controlling the fungal agents causing rot in yam.

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Effects of three aqueous plant extracts in the control of fungi associated with post-harvest rot of yam (Dioscorea alata)

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Assiri Kouamé Patrice, Koutoua Séka, Yao Kouassi Francis, Assi Serge Théophile, Fofana Fatoumata, Hortense Atta Diallo.
Effects of three aqueous plant extracts in the control of fungi associated with post-harvest rot of yam (Dioscorea alata).
Int. J. Agron. Agri. Res. 11(3), 77-87, September 2017.
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