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Great Sauternes can be made only from grapes that have been assaulted by “botrytis cinerea,” more commonly known as the noble rot. The semillion gape is the grape most prone to the rot.
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The noble rot is a fungal infection that is aggravated by humid conditions. Its result is to discolor the healthy grapes, wither their skins, and thusly concentrate their content of sugar, acidity, and glycerol.
The Ciron River, in the southwest part of France—in lower Bordeaux—runs cold. It flows through the Sauternes district into the warmer Garonne. In the fall, this convergence stimulates a mist that blankets the adjacent vineyards. The spores proliferate in these mists and go to work in the grapes. The mist is burned off by the sun and disappears by late in the morning.


