The red grape variety is an interspecific new variety between Blauburger x Klosterneuburg 1189-9-77(Seyve-Villard 18-402 x Blaufränkisch). Synonyms are Klosterneuburg 1355-3-33 and Rathay Noir. Genes of Vitis berlandieri, Vitis cinerea, Vitis lincecumii, Vitis rupestris and Vitis vinifera are included. The crossing of the hybrids was carried out in 1970 by Dr. Gertraud Mayer at the Klosterneuburger Weinbauinstitut (Langenzersdorf Vine School). A similar variety is the newly bred Roesler. The former director of the institute Emerich Ráthay (1845-1900) was honoured with the name. In Austria it was approved as a quality wine grape variety in 2000. The vine is resistant to both types of mildew and frost down to minus 25 °Celsius. It produces a deep dark red wine, rich in tannins and extracts, which is well suited for barrique ageing. In 2016, 32 hectares of vineyard area were designated in Austria with increasing tendencies (Kym Anderson).
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