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The effects of crude ethanolic plant extracts of Garcinia kola seeds and Nauclea latifolia root on mycelial growth of seed-borne fungi of African yam bean at different concentrations (100 mg/ml, 60 mg/ml and 20 mg/ml) were investigated. The seed-borne fungi were Aspergillus flavus, Fusarium moniliforme, Penicillium sp. and Absidia sp. Results showed that all the plant extracts at various concentrations inhibited the mycelial growth of the seed-borne fungi. However, the inhibitory effects of the plant extracts increased with higher concentrations. The percentage inhibition of mycelial growth of fungal isolates by G. kola ranged from 57.9%-100%; 38.8%-72.6%; 31.4%-82.3% and 68.7%-100% for Absidia sp., Penicillium sp., A. flavus and F. moniliforme, respectively. Also, the percentage inhibition of growth of isolates by N. latifolia ranged from 52.3%- 89.4%; 37.1%-62.5%; 37%-93.6% and 49.7%-95.2% for the seed-borne fungi, respectively. G. kola extracts had more inhibitory activities on Absidia sp., Penicillium sp. and F. moniliforme while N. latifolia was more active against A. flavus.
Key Words: Extracts, Inhibition, Seed-borne fungi, African yam bean, Mycelial growth.