The white grape variety comes from Switzerland. Synonyms are Bagrena, Diola, Diola Bianca, Diollaz, Dugiolo, Jiolaz, Jolaz, La Jollas, Tiola and Tiolla. The rediscovered vine was considered lost since the beginning of the 20th century. According to DNA analyses, there is a parent-offspring relationship with the Rèze variety. The variety is cultivated in small quantities in the canton of Valais. However, no stock was recorded in 2016 (statistics Kym Anderson).
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Markus J. Eser
Weinakademiker und Herausgeber „Der Weinkalender“