It's abundant, brittle and integral to the production of winegrapes. It's sulfur, and winegrowers have been spraying or dusting it over their vines on a regular basis since early April to prevent mildew from forming on the budding grape clusters.
"It doesn't kill mildew; it just prevents it," said Joe Valente of Kautz Farms. "If you already have mildew, then you have to use other materials to get rid of it."
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