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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 Heat Days Summation System (Degree Days), which California divided into five climates and was introduced in 1944. He wrote the book "General Viticulture", first published in 1962. In a later edition (1974) he propagated the use of the notorious rootstock AxR 1 whose inadequate resistance to the phylloxera from the 1980s onwards caused severe damage in the California vineyards. See also under Maturity date and and temperature sums,

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