One interesting consequence of Prohibition was that vineyards were replanted with lower quality grapes such as Alicante Bouschet that could survive transportation to home winemakers, and this tradition of home winemaking changed taste preferences from a dry style before Prohibition to a much sweeter style. In general Prohibition had a devastating effect on commercial winemaking in the country, which only started to recover in the late 1960s and 1970s under major industry pioneers such as Ernest and Julio Gallo, Robert Mondavi and the world-class viticultural scientists at the University of California, Davis. The latter institution has played a leading role in the recovery of wine in the United States, in particular identifying just what vines were actually planted (notably California's signature grape, the robust red Zinfandel, which was found to be Croatia's Crljenak Kaštelanski), and encouraging the use of better clones of the traditional European varieties. In the 1970s, geographical appellations were designated as American Viticultural Areas.