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The white grape variety (also Alzey S. 3983, Kanzlerrebe) is a new cross-breed of Müller-Thurgau x Silvaner (which was confirmed by DNA analyses published in 2012). The cross was made in 1927 in Germany by Georg Scheu at the Rebenzüchtungs-Anstalt Alzey in Rhineland-Palatinate. It was released for cultivation in four German growing regions in 1967. The name is meant to refer to the special qualities and is derived from the two German chancellors Konrad Adenauer (1876-1967) for "maturity" and Ludwig Erhard (1897-1977) for "fullness". The early-ripening vine is susceptible to both types of mildew, but resistant to botrytis. It produces full-bodied, aromatic white wines with ageing potential, which are also readily vinified sweet. In 2018, it occupied 25 hectares of vineyards in Germany (D-STATIS).

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