The white grape variety is in Japan cultured; the origin is unknown. Synonyms are Kochiou, Konshu, Koshiou, Koshiourebe and Koushuu. It is named after the former province of Kōshū, which is roughly the same as today's prefecture Yamanashi covers. According to one hypothesis, it allegedly reached Europe via the Silk Road in the eighth century China and was introduced to Japan by Buddhist monks. According to another hypothesis, it was discovered by a certain Amemiyas Kageyu around the year 1186 in the south of the Kofu valley at the foot of Mount Fujiyama. According to done in 2006 DNA analysis it is a species Vitis vinifera, which makes the hypotheses unlikely. There is a close relationship to the variety Koshu Sanjaku, Koshu was crossing partner of the new breeds Koshu Semillon and Komahikari,
The late-ripening vine is prone to both mildews, but resistant to Botrytis, She becomes traditional Pergola education systemTanazukuri cultivated and is ideal for the climatic conditions in Japan. The rose-colored, thick-skinned berries produce fresh, alcohol-rich and rather low-extract white wines, which serve as a blend for red and white wines. Above all, she is but as table grape and also for distillation used. It is mainly grown in Yamanashi Prefecture on the main island of Honshu. In 2010, 168 hectares of vineyards were reported (Statistics Kym Anderson ).
Picture left: By Sophie Jacquin - Own work , CC BY-SA 3.0 , Link
Picture right: By genta_hgr - Grape , CC BY 2.0 , Link
Source: Wine Grapes / J. Robinson, J. Harding, J. Vouillamoz / Penguin Books Ltd. 2012