The white grape variety is an interspecific Neuzüchtung between Eger 2 (Villard Blanc) x Bouvier. Synonyms include Bianka, EC 40, ECS 40, Egri Csillagok 40, and May Rot. It contains genes from Vitis berlandieri, Vitis rupestris, and Vitis vinifera. The Kreuzung of the Hybride took place in 1963 in Ungarn by breeders Jozsef Csizmazia József and Laszlo Bereznai. The Sortenschutz was granted in 1978. The variety was a crossing partner of the new breeds Backa, Cabernet Volos, Jázmin, Rubinka, Sauvignon Nepis, and Sauvignon Rytos. It is used as a Keltertraube and Tafeltraube.
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