Non-Saccharomyces yeasts have a substantial role in the early stages of wine fermentations, since they can reach populations up to 106–108 colony forming units (CFU)/mL depending on fermentation conditions and grape health (Heard and Fleet, 1988). With the increase of alcohol concentration, tolerant indigenous or commercial strains of Saccharomyces cerevisiae take over and complete the transformation of the must sugars into ethanol, CO2 and other secondary metabolites (Fleet and Heard, 1993). The amount of biomass produced by the non-Saccharomyces species during the first part of fermentation is sufficient to have an impact on the wine composition and consequently their contribution during the fermentation process cannot be ignored