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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. He worked on the University of California in Davis with the oenologists Maynard A. Amerine (1911-1998) the heatage summation system (Degree Days), which California divided into five climates and introduced in 1944. He authored the first published in 1962 book "General Viticulture". In this he propagated in a later edition (1974) the use of the infamous Unterlagsrebe AxR 1 whose lack of resistance to the phylloxera from the 1980s led to severe damage in the California vineyards. See also below Maturity date and and temperature sums,

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