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Powdery Mildew Alert

Powdery mildew is just starting to show up on untreated plants in the research vineyard at Blairsville, GA. The photograph below was taken today, but infections likely started occurring some time ago. I hope you will not see it yet in well managed vineyards, but recent rains and other difficulties may have hampered spray programs. When rain is occurring frequently, tighten your spray programs to 7-10 day intervals, and use the more efficacious materials at critical infection periods such as bloom and early cover sprays. Scout your vineyards and make sure to contact your local county agent should you have questions concerning this disease or others. The 2020 Southeast Regional Bunch Grape Integrated Management Guide can be found at, and it contains valuable information relative the timing and efficacy of fungicides for powdery mildew.

Early powdery mildew on grape leaf. Note the white fuzzy patches on the upper side of the leaf (photo courtesy of Brooke Warres; UGA Plant Pathology).
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Phil Brannen

About Phil Brannen

Phil Brannen is a Professor in the Plant Pathology Department at the University of Georgia. He attended the University of Georgia for his undergraduate degree in Plant Protection and Pest Management, where he also received an M.S. in Plant Pathology, followed by a Ph.D. in Plant Pathology from Auburn University. He has extensive experience with disease management programs in numerous cropping systems. He serves as the extension fruit pathologist for Georgia – conducting research and technology transfer for multiple fruit commodities. His efforts are directed towards developing IPM practices to solve disease issues and technology transfer of disease-management methods to commercial fruit producers. He also teaches the graduate level Field Pathology Course, the History of Plant Diseases and their Impact on Human Societies Course, team-teaches the IPM Course, coordinates the Viticulture and Enology in the Mediterranean Region Course (Cortona, Italy), and guest lectures in numerous other courses throughout the year.