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The red grape variety (breeding number Klosterneuburg 1358-1-47) is an interspecific new breed between Zweigelt x Klosterneuburg 1189-9-77 (Seyve-Villard 18-402 x Blaufränkisch). It contains genes from Vitis berlandieri, Vitis cinerea, Vitis lincecumii, Vitis rupestris, and Vitis vinifera. The crossing of the hybrids took place in 1970 by Dr. Gertraud Mayer at the Klosterneuburg Wine Institute (Langenzersdorf) in Lower Austria. A similar variety created here is the new breed Rathay. The name honors the former institute director Leonhard Roesler (1839-1910). In Austria, it was approved as a quality wine grape variety in 2000. The medium ripening vine is resistant to both types of mildew and Botrytis (PIWI variety) as well as frost down to minus 25 degrees Celsius. It produces a deep dark, tannin-rich and extract-rich red wine that is well suited for barrel aging. It occupies 216 hectares of vineyard area in Austria with a strongly increasing trend, as well as 1 hectare in Hungary. In 2016, a total of 217 hectares of vineyard area were reported (Statistics Kym Anderson). Images: Ursula Brühl, Doris Schneider, Julius Kühn Institute (JKI).

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