Vineyardists in the Pacific Northwest have been relatively lucky regarding the number of grape diseases they have to worry about. But recent experiences indicate that Washington growers should also watch for diseases associated with vine decline, and crown gall could again be a problem in the state. In the mid-1990s, young California vineyards began showing vine decline symptoms, said Dr. Doug Gubler, pathologist from the University of California. Healthy vines were found next to stressed vines. Researchers could generally detect one or two fungi in the affected vines. A black streaking was found on the woody tissue when vines were […]