Washington State produced an estimated 174,000 tons of juice grapes in 2012, down from its ten-year average of 193,000 tons, according to Trent Ball, director of the vineyard and winery technology ­program at Yakima Valley Community College. Washington is the nation’s leading Concord and Niagara grape producer, typically producing about half of the country’s grapes that are used for juice and other food products. The nation’s Concord crop for 2012 is estimated at 294,000 tons, the smallest yield in more than a decade. Damaging frosts last spring reduced Michigan’s crop by 60 percent, and in New York and Pennsylvania, yields […]