The white grape variety is an interspecific new variety between Seyval Blanc x Bacchus. Synonyms are Muscat de la Birse and VB 86-6; the name is derived from the Rhine tributary Birs. It contains genes of Vitis lincecumii, Vitis rupestris and Vitis vinifera. The hybrid was crossed in 1986 by the Swiss private breeder Valentin Blattner in Soyhières in the canton of Jura in Switzerland. The early to medium ripening vine is relatively resistant to both types of mildew and frost, but susceptible to trickling. It produces low-acid white wines with a subtle muscatel tone and is also used as a table grape. The variety is cultivated by the grower in his vineyards in Soyhières, and to a lesser extent in Belgium.
Source: Wine Grapes / J. Robinson, J. Harding, J. Vouillamoz / Penguin Books Ltd. 2012
Picture: Ursula Brühl, Doris Schneider, Julius Kühn Institute (JKI)