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Noble rot, valued in the production of certain sweet wines, is caused by

  • A.Botrytis cinerea
  • B.Saccharomyces cerevisiae growing on the skins
  • C.Acetobacter aceti developing in the vineyard
  • D.Oenococcus oeni infecting the grapes before harvest

Answer: A

Under the right dry conditions Botrytis cinerea shrivels the grape and concentrates its sugar and acid, giving the intensity of wines such as Sauternes. In damp conditions the same fungus causes grey rot, which ruins the crop instead.

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