I read the following about the grape used for the Late Harvest Vignoles that I purchased from Flag Hill Winery:
Vignoles produces excellent wines of many different styles. It is favored for dessert wines, especially when picked late in the season. The fruit can develop high sugar content while retaining high acidity. Vines are hardy with moderate vigor and productivity. Budbreak is late, reducing the risk of spring freeze injury. Clusters are small, very compact, and highly susceptible to Botrytis bunch rot.