If conditions in fall are warm and humid enough, grapes left on the vine may be infected by a fungus called Botrytis cinerea, or "noble rot". Botrytized grapes are shriveled and dehydrated, but their sweetness is concentrated. The best examples of very sweet dessert wines that are made from botrytized graped are produced in Bordeaux and Germany.
*Botrytized grapes make lusciousy sweet wines...most grape varieties affected by noble rot are Riesling, Sauvignon blanc, Chenin blanc, Semillon, and Gewurztraminer.
