Optimal selection of wine yeast strains for individual winemaking grape musts is discussed with reference to: variability of composition of grape musts, even within a single cultivar; effects of elemental composition of musts on fermentation performance of wine yeasts; differences between yeast strains in responses to grape must composition; effect of elemental composition on wine aroma; and the basis of different sensitivities of wine yeasts to limiting K and low pH (We recommend that you consult the full text of this article).