Synthesis of silver nanoparticles using crude leaf extracts of Acacia nilotica, Azadirachta indica, Carissa spinarum, Melia azedarach, Senna didymobotrya and Warburgia ugandensis, and their antifungal activity against Sporisorium scitamineum

Bio-synthesised silver nanoparticles are effective in controlling several micro-organisms. They correspondingly environmentally friendly, affordable, and easy to synthesise when compared with chemically synthesised nanoparticles. This study investigated the efficacy of biosynthesized against fungus Sporisorium scitamineum, causal agent sugarcane smut. The reduction nitrate upon mixing plants’ crude extracts was evidenced by change colour mixture dark brown. Optimization mixtures using ultraviolet-visual spectroscopy showed peaks range 340 450 nm. Fourier transform infrared analysis identified proteins be essential capping agents, reducing sugars were responsible for stabilizing transmission electron microscope sizes vary between 3 70 Carissa spinarum Melia azedarach had most antifungal activity S. scitamineum as observed from inhibition-zone assay. Silver successfully synthesized selected botanicals. All varying effects scitamineum. C. M. exhibited highest activity, while Azadirachta indica least.   Key words: Acacia nilotica, spinarum, Senna didymobotrya, Warburgia ugandensis, azedarach, indica, bio-synthesised nanoparticles, activity.