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That includes a sixth century account of the purchase of grape vines written on papyrus and books on viticulture and oenology dating from the 14th through 19th centuries.

Envínate is a group of four friends from different parts of Spain who met in oenology school and who are now making wines from the Canary Islands, Ribeira Sacra and other regions.

“What is most surprising over the last five years is the suddenness and magnitude of the problem,” said Jean Natoli, a winemaker and oenology consultant.

Their letter galvanized support and financial donations, and within weeks the pair had established a scholarship fund for minority students studying viticulture and oenology at the California Polytechnic State University at San Luis Obispo.

Brittany Sherwood, who joined Heitz in 2012 straight out of the viticulture and oenology program at University of California, Davis, and who learned under David Heitz, has stayed on as winemaker.