White oak. The variety of American oak which is used to manufacture barrels.
Yeast. Promotes fermentation of grape juice. The 'dust' on a grape, known as the 'bloom' is wild yeast. Most wine makers prefer to use their own yeast strains.
White oak: The variety of American oak that is used for barrel manufacture. The wood from all other varieties of oak is more or less porous, and cannot be used for containers to hold liquids.
American Oak: Oak from the American White Oak tree (Quercus alba). Most American oak is sourced from the mid western states of the USA, particularly Missouri. Imparts vanillin and coconut characters, and is favoured for use in red wine making.
Concha y Toro, a Chilean winery, has 100 hectares planted from a Carménère clone and produces a varietal that is aged in both French and American white oak barrels for at least 3 - 4 years before release.
 See also: Region, Tannin, White, Fruit, Harvest
  
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