Reduction and/or elimination of malic acid in wines were accomplished with both natural and genetically enhanced organisms. The naturally selected wine yeast ICVGRE and 71B reduced the malic acid content in wine by 18 and 33%, respectively, while ML01 converted all the malic acid to lactic acid. The wine fermented with ICV-GRE + Lalvin 31 had lower lactic acid and titratable acidity than ML01 because of malic consumption by the yeast before MLF. ML01 produced more SO2 than the other yeasts.