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The white grape variety (also Freiburg 128-40) is a new cross between Silvaner x Chasselas Blanc (Chasselas) according to DNA analyses published in 2012. The cross was made in 1940 by Dr. Johannes Zimmermann (1907-1998) at the State Viticultural Institute in Freiburg. Plant variety protection was granted in 1971. The medium ripening vine is susceptible to botrytis. It produces acidic white wines with a neutral taste, which are mainly used for sparkling wine production. In Germany, it occupies 50 hectares of vineyards with a strong downward trend. In Switzerland, it is cultivated on 0.5 hectares on Lake Biel. In 2016, a total of 51 hectares of vineyards were designated (Kym Anderson).

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