GLD in WA vineyards
Wine grapevines Vitis vinifera L. are susceptible to a broad range of plant viruses—nearly sixty among twenty different genera. That’s more than any other perennial fruit crop. Among the virus and virus-like diseases infecting grapevines worldwide, grapevine leafroll disease (GLD) is considered to be the most economically destructive. It accounts for an estimated 60% of yield losses due to virus diseases in grape production worldwide.
The Crop Profile for Wine Grapes in Washington (MISC0371E), published in 2003 (http://wsprs.wsu.edu/CropProfiles.html), estimated that GLD affected just under 10% of the state’s wine and juice grape acreage, but GLD incidence seems to be increasing across the state in recent years. Today, GLD is considered a major constraint to the production of premium wine grapes in Washington State. This publication presents the latest research findings and recommendations regarding GLD directed toward the wine grape growers and certified nurseries of Washington State.