Life Style / Wine Grapes / Geisenheim Gm318-57: White wine producing hybrid cultivar technically known as GM318-57 created in 1957. Reported as derived from Riesling cl.239 F2 and Chancellor parents. Moderately winter hardy. Susceptible to leaf burn from copper-containing sprays and fungus diseases such as Powdery Mildew. Usually ripens late September where successfully grown in Nova Scotia, Canada. A reportedly slightly hardier yet similar hybrid is the Jost (Geisenheim) listed below. A somewhat similar cultivar, currently grown on the south island of New Zealand, is a variety named Breidecker.
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