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Wild yeasts present on grape skins typically

  • A.Have no effect whatever on the course of fermentation
  • B.Start the fermentation but die as the alcohol rises
  • C.Continue working long after Saccharomyces has stopped
  • D.Produce all of the alcohol in a finished wine

Answer: B

Genera such as Hanseniaspora dominate the first hours but are killed once the ethanol reaches roughly four or five per cent, at which point the more alcohol-tolerant Saccharomyces takes over. Their early activity still contributes to the aroma of the finished wine.

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