Yeast Malt HiVegâ„¢ Agar (YM HiVegâ„¢ Agar) is recommended for the isolation and cultivation of yeasts, moulds and other aciduric microorganisms. Fungistatic materials such as sodium propionate and diphenyl are added to YM Agar to eliminate moulds and thus permit enumeration of yeasts from mixed population. Yeast Malt HiVegâ„¢ Agar (YM HiVegâ„¢ Agar) is prepared by replacing peptone with HiVegâ„¢ peptone making the medium free of BSE/TSE associated risks.