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Wild yeasts are a problem in a brewery mainly because they

  • A.Are unable to grow at ordinary brewery temperatures at all
  • B.Consume the alcohol that is already present in the beer
  • C.Raise the pH of the finished beer back towards neutral
  • D.Ferment sugars the brewing yeast leaves and add off-flavours

Answer: D

A wild yeast may attenuate further than the pitching strain, leaving a beer that is drier, over-carbonated in the package and carrying flavours the brewer did not intend. Rigorous hygiene and pure pitching yeast are the defences.

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