ICV-D80 was isolated by Dominique Delteil of the ICV in 1992 from the Cote Rotie area of the Rhone Valley. In addition to its' ability to enhance tannin structure, it's know for being able to ferment musts high in sugar and polyphenols. With proper nutrition, aeration and fermentation temperatures below 82 degrees F, ICV-D80 will ferment up to 16% alcohol. ICV-D80 brings high fore-mouth volume, big mid-palate mouthfeel and intense fine grain tannin to reds. It is one of the best strains for contributing big tannin volume in a blend. ICV-D80 is characterized by concentrated, dark fruit, smoke and a licorice finish. When blended with wines fermented with ICV-D254 or Syrah, wines fermented with ICV-D80 bring more tannin intensity to the blend. In short, this yeast is truly great for the structural support it can bring to a wine. However, if the winemaker is looking for highlighted fruit and ethereal top-notes as well, it often may not be the best choice when using a single strain in the vintage. Therefore, it may help to think of it as usually needing a companion strain to help bring everything to a finished wine.
Lalvin ICV-D254®: For mouthfeel in Mediterranean-style reds
Lalvin ICV-D254 was selected by the ICV in 1998 from Syrah fermentations in Gallician, south of the Rhône Valley. In red wines, Lalvin ICV-D254 promises high fore-mouth volume, big mid-palate mouthfeel, intense fruit concentration, smooth tannins and a mildly spicy finish. Red wines made with Lalvin ICV-D254 may be blended with Lalvin ICV-D80 or Lalvin ICV-D21 to create more concentrated, full bodied wines. In unripe reds, ferment 25-50% of the lot with Lalvin ICV-D254 and the balance with Lalvin ICV-GRE to help mask vegetative character. As a complement to Lalvin Bourgoblanc CY3079, winemakers in North America use Lalvin ICV-D254 for fermenting Chardonnay with nutty aromas and creamy mouthfeel.
Lalvin ICV-D21®: The ‘terroir’ yeast
Lalvin ICV-D21 was isolated in 1999 from Pic Saint Loup Languedoc “terroir” during a special regional program run by the Institut Coopératif du Vin (ICV)’s Natural Micro-Flora Observatory and Conservatory. Lalvin ICV-D21 was selected for fermenting red wines with stable color, intense fore-mouth, mid-palate tannin structure, and fresh aftertaste. Unlike most wine yeasts, Lalvin ICV-D21 contributes both higher acidity perception and positive polyphenol reactive polysaccharides. Strong interactions of the polysaccharides with the floral and fruity volatile compounds (β-ionone, ethyl hexanoate) contribute to a more stable aromatic profile in the mouth. These attributes avoid the development of cooked jam and burning-alcohol sensations in highly mature and concentrated Cabernet Sauvignon, Merlot and Syrah. During fermentation, Lalvin ICV-D21 produces very few sulfides and it is also noted for its good fermentation performance even under high temperature and low nutrient conditions. It allows for the expression of fruit from the grapes while reducing the potential for herbaceous characters in Cabernet sauvignon. When blended with wines fermented with Lalvin ICV-D254 and Lalvin ICV-D80, Lalvin ICV-D21 brings fresher, sustained intense fruit and lively sensations beginning in the fore-mouth and carrying through to the aftertaste. Lalvin ICV-D21 is also used in very ripe white grapes, barrel-fermented to develop fresh fruit aromas, volume and acidity which compliments wines fermented with Enoferm ICV-D47 in blends. Rosé wines fermented with Lalvin ICV-D21 have enhanced red fruit, fore-mouth volume and balance, making it the perfect blending complement to Rosé wines fermented with Lalvin ICV-GRE.