It's an intersection of wine grapes produced in Germany in 1975 at the Research Institute of Freiburg. This variety is very interesting for the high quality of the wines produced and disease resistance. It has many similarities with Chardonnay.
The three disease resistant Bouquet varieties selected for grape juice
about grape varieties - PIWI International
Piwi grape varieties - the future of viticulture?
BRONNER Giol Italia
BRONNER, RESISTANT VARIETY, WINE GRAPE
Piwi wines
BRONNER, RESISTANT VARIETY, WINE GRAPE
Bronner - White Wine Grape Variety
Disease resistant grape varieties in Spain
PIWIs: the most promising varieties