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The red grape variety is a new breed between Schiava Grossa (Trollinger) x Riesling. Synonyms are Geisenheim 3-37 and Redberger. Incidentally, the same parents also gave rise to the new varieties Kerner and Witberger. The cross was made in 1928 by Dr. Heinrich Birk (1898-1973) at the Research Institute Geisenheim (Rheingau), the variety protection was granted in 1969. However, it must not be confused with the Rotburger variety (synonym for Zweigelt). The Rotberger variety was a crossing partner of the two new varieties Bolero and Piroso. The early-maturing, high-yielding vine is susceptible to powdery mildew and tends to form stingy shoots. It produces a light ruby-red wine with a fragrant aroma that is particularly suitable for making rosé and red sparkling wine, as well as for blending. In 2016, it occupied 10 hectares of vineyards in Germany, mostly in the growing regions of Rheinhessen and Rheingau, with a strong downward trend. There are also small populations in Trentino (northern Italy), as well as New Zealand, Canada (1 ha), USA and South Africa (Kym Anderson).

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