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Noble rot (French: pourriture noble; German: Edelfäule) is the benevolent form of a grey fungus, Botrytis cinerea, affecting wine grapes. Infestation by Botrytis requires moist conditions, and if the weather stays wet, the malevolent form, "grey rot", can destroy crops of grapes. Grapes infected with Botrytis when they are ripe, but then exposed to drier conditions become partially raisined, and this form of infection is known as noble rot. Picked at a certain point during infestation can produce particularly fine and concentrated sweet wine. Some of the finest Botrytized wines are literally picked berry by berry in successive tris (French for "sortings").
Noble rot on Riesling grapesThe best known fine wines made from noble rot infested grapes are Aszú (Hungary), Sauternes (France) and Beerenauslese or Trockenbeerenauslese (Germany). Others include the Italian Amarone, Romanian Cotnari, French Monbazillac and Austrian Ausbruch. Depending on conditions the grapes may be only minimally botrytized. Botrytis has also been imported for use by winemakers in California and Australia. In some cases inoculation occurs when spores are sprayed over the grapes, while some vineyards depend on natural inoculation from spores present in the environment.