the sugar content of the grapes is therefore a very important factor when the time of harvesting is chosen. The amount of residual sugar in solution after fermentation is also an important stylistic consideration and the final sugar, acid and alcohol levels must be balanced in the finished product. Residual sugar is desirable in dessert or sweet wine, but not in most table or dry wines. A better understanding of the factors that influence sugar utilization and fermentation rate will allow for greater control over the fermentation parameters and therefore allow better diagnosis of problem fermentations.