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The releases began on a limited basis in 2015. Results of that test encouraged the researchers to begin releasing larger numbers of the greenhouse-raised wasps, called Anagrus daanei, in the two counties, beginning last year.
Today about half of Silva’s vineyard ground is devoted to such traditional California varieties as Cabernet Sauvignon, Cabernet Franc, Malbec, Petite Syrah and Pinot Gris.