Culture filtrates and organic solvent extracts of Sclerotium cepivorum liquid cultures were evaluated for their antifungal activities against the same fungus. Filtrates at 50% taken from 30 to 45-day-old cultures have reduced S. cepivorum growth by 51.9%. This treatment has also caused a reduction in the number of sclerotia by 98.6%. No sclerotial germination was observed on the media amended with the culture filtrates at all concentrations tested (10, 25 and 50%),.Among all organic solvent extracts, methanol extract was the strongest growth inhibitor against the fungal pathogen; it inhibited S. cepivorum growth by 82.2, 93.3, and 93.6% when used at concentrations of 400, 800, and 1200 ppm, respectively. At the same concentrations, ethyl acetate extract exhibited high inhibition to the fungal growth i.e., 85.56, 88.89, and 90.56%, respectively, while chloroform extract was the least effective in this regard causing  71.11% mycelial growth inhibition when used at concentrations of either 800 or 1200 ppm. All organic-solvent extracts completely suppressed the formation and germination of sclerotia at all concentrations. Further studies are needed to isolate different bioactive compounds from secondary metabolites of S. cepivorum.