High-tech photos and precise air blasts identify and remove MOG.Grapes, stems and leaves are photographed as they enter the Delta Vistalys optical sorter. After a week of unseasonably high temperatures, the sky darkened and cast a somber, uneven light across the crush pad at Clos Pegase winery in Napa Valley. Nearby, knots of field workers raced to pick clusters of Chardonnay and Cabernet Sauvignon as the Pacific jet stream poised to unleash a storm that would deliver a decisive conclusion to the 2010 harvest.