Walt Mahaffee, Ph.D., Research Plant Pathologist, USDA-Agricultural Research Service, Corvalis explains how and why Grape Powdery Mildew populations become resistant to certain fungicides. He also explores how to mitigate resistance and describes current research on how fungicide resistance starts in Grape Powdery Mildew and how it spreads from one place to another.

 References:

• Mahaffee’s USDA Agricultural Research Service webpage
• Fungicide Resistance Action Committee website
• Fungicide Resistance in Grapes: Grower Perspective Episode 6 | Vineyard Team Board Members (Sustainable Winegrowing)
• Fungicide Resistant Mildew Episode 09 | Dr. Tim Miles (Sustainable Winegrowing)
• The Goldilocks Principle & Powdery Mildew Management Episode 2 | Dr. Michelle Moyer (Sustainable Winegrowing)
• Grape Powdery Mildew Management and Inoculum Monitoring Episode 5 | Walt Mahaffee (Sustainable Winegrowing)
• Slides for “Grape Powdery Mildew Management and Inoculum Monitoring”
• Gubler-Thomas Model
• PMapp: A Mobile App for Assessing Grape Powdery Mildew
• Sign Up | Irrigation Efficiency Project
• Sustainable Ag Expo
• Sustainable Ag Expo Attendee Registration Discount
• UC Pest Management Guidelines for Grape Powdery Mildew
• What the mildew? A perspective on another challenging year managing powdery mildew | Article by Dr. Mahaffee

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