Similarly, Shafique et al. (2006) reported 60% Fig. 6. Effect of different concentrations of methanolic fruit extract of Eucalyptus citriodora on growth of Fusarium oxysporum strain B. Vertical bars indicate standard error of means of three replicates. Values with different letters show significant difference (p≤0.05) as determined by Duncan’s multiple range (DMR) test. Antifungal activity of bark extract of E. citriodora: The growth assays of F. oxysporum strain B in terms of dry biomass production against exposure to methanolic bark extract of E. citriodora revealed an excessive interference as presented in Fig. 5. Control treatment was used to compare the difference between the treatments. It was evident from the results that with increasing the extract concentration; the significant reduction in biomass was more visible with an erratic pattern. The 1% concentration depicted less negative effect on biomass inhibition (12.63% decline) but significantly lower than control. The treatments 1.5-3.5% were comparatively insignificant among themselves as these inclined about 20-36% cessation in fungal growth. Among all the concentrations 4.5 and 5% concentrations were proved to be the most effective against the fungal pathogen as these persuaded around 57.8 and 60% subjugation in dry biomass production, respectively. Antifungal activity of fruit extract of E. citriodora: In general the methanolic fruit extract of E. citriodora was found to be less effective in terms of its antimycotic potential against test fungal growth than leaf extracts. A variable response of dry biomass production in F. oxysporum strain B was recorded to methanol fruit extract of E. citriodora in different concentrations (Fig. 6). All the treatments presented a piercing and significant imprisonment in dry biomass production as compared to control but the suppression rate among the concentrations was negligible. There was about 45-50.5% inhibition in fungal growth due to all the employed concentrations. Among the three plant parts of E. citriodora tested, performance of leaf extract was the best in suppressing the growth of target pathogen followed by fruit and bark extracts. Discussion In the present study, pathogenecity test was performed to determine the pathogenic potential of four strains of F. oxysporum. The results depicted that all the strains had the potency to induce wilt as all of the strains caused more or less typical symptoms on plants. Among these, F. oxysporum strain B induced maximum reduction in incidence of Alternaria alternata on wheat due to aqueous leaf extract of C. album.