Inhibitory Efficacy of Lemon-Grass (Cymbopogon citratus) Extracts on Some Selected Fungal Root Pathogens
Onuoha Udumma Nsofor, Alaebo Prince Ogochukwu, Ukpabi-Ugo Jacinta Chigozie, Enya Emmanuel, Okakpu Joseph Chinemelu, Anah Joel Okwuchukwu, Ugwu Paschal, Okolie Jennifer Chisom, Onwuatuelo Chizitere Onyinye
South Asian Research Journal of Natural Products · pp. 81–87 · Published 18 May 2023
Abstract
The organisms Aspergillus niger, Fusarium moniliforme, Botryodiplodia theobromae, Rhizopus spp., and yeasts were isolated from rotten cassava tubers. A pathogenicity test was carried out on healthy cassava tubers using the previously isolated organisms. Aspergillus niger, Fusarium moniliforme, and Botryodiplodia theobromae were found to be pathogenic against cassava. The inhibitory efficacy of leaf extracts of Cymbopogon citratus (lemongrass) on the fungal root pathogens isolated was investigated in vitro using the agar-well diffusion method. The extraction solvents used were ethanol and water, which caused inhibition of the three pathogens with varying diameters. Twenty-four millimetres was the highest zone diameter of inhibition recorded, and 11 millimetres was the lowest zone diameter of inhibition. The minimum inhibitory concentration (MIC) ranged from 25–1000 mg/ml, while the minimum fungicidal concentration (MFC) ranged from 50–200 mg/ml, depending on isolates and extracting solvent. Ethanolic extracts showed greater antifungal activity than aqueous extracts.
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