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Winkler Albert Julius

The American scientist Albert Julius Winkler (1894-1989) was one of the most important pioneers in American viticulture. At the University of California in Davis, he worked with oenologist Maynard A. Amerine (1911-1998) on the Degree Days system, which divided California into five climate zones and was introduced in 1944. He wrote the book "General Viticulture" which was first published in 1962. In a later edition (1974), he propagated the use of the notorious AxR 1 rootstock vine, whose lack of resistance to phylloxera led to severe damage in California's vineyards from the 1980s onwards. See also under ripening time and and temperature totals.

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