DMDC is useful at bottling to obtain microbiologically stable wines; it also can be used during winemaking for sweet wine mutage. Furthermore, Brettanomyces contamination risks during barrel aging could be greatly reduced by using DMDC in combination with a dose of 0,4mg/L of active SO2. This reduces conventional free SO2 dosages by one third and could resolve problems associated with high pH red wines that are susceptible to alterations. Presented at Enoforum 2009, 21-23rd April, Piacenza, Italy