DMDC use has been authorized in the United States since 1988 during wine and juice bottling. The FDA also approved its use for inactivating yeast contamination such as Brettanomyces in wines in 1998. In 2006, DMDC was also approved for use in the European Union for wines with quantities of sugar equal or greater than 5g/L. Experiments to examine specific technological applications of DMDC were completed. Sweet wine mutage trials (Part 1) and efficacy against Brettanomyces type yeasts (Part 2) were examined. Presented at Enoforum 2009, 21-23rd April, Piacenza, Italy