Grapevine leafroll disease is easy to diagnose in red varieties, like this Cabernet Sauvignon vine, but more difficult in white varieties where the only symptom might be downward curling of leaves. The Washington grape industry has put a bull’s-eye on grape viruses and diseases and is going after its target in a big way. The Washington Wine Industry Foundation recently received a grant for nearly $250,000 to fund a clean-plant project designed to thwart what’s been identified as the principal threat to the state’s economic sustainability of the grape and wine industry. Grape viruses, such as grapevine leafroll disease, have […]