This cluster was infected with downy mildew about two weeks before bloom. Washington growers would likely see this type of infection from rain early in the season In the past, Dr. Gary Grove wasn’t concerned about downy mildew becoming a resident grape disease in the Pacific Northwest. The disease is not yet found in Washington State, but since working on climate change issues, the pathologist now worries the disease could gain a foothold. Downy mildew, a serious grape disease found around the world, is problematic in regions with warm, moist summers, said Grove, Washington State University pathologist and director of […]