Grape Powdery Mildew Control in California Vineyards 
Grape Powdery Mildew is the number one disease in California vineyards. More dollars are spent on powdery mildew control and, yet, this disease still accounts for more crop losses than any other grape pest. This course, sponsored by Western Farm Press, explores the different fungicide classes; treatment options for powdery mildew in California; resistance management, and regional differences in disease development. It also includes a detailed approach to using the UC Powdery Mildew Risk Assessment Index (RAI) to predict infections. Seasonal patterns of disease development differ from region to region (as well as year to year), and cost-effective management strategies must be based on local conditions that favor or inhibit pathogen reproduction. Season-long control depends on reducing early-season inoculum and subsequent infections with well-timed fungicide applications. Spray timing and frequency (and coverage) is everything; these vary depending on local weather, temperature, varietal susceptibility, vine growth stage and material choice.
- Lectures 14
- Questions 25
- Duration 1 h (approx)
This course is accredited by:
- California Department of Pesticide Regulation (1 hour Other)
- Certified Crop Adviser (CCA) Accredited in U.S. and Canada (2 hours IPM)
- Hawaii Department of Agriculture (1 CEU, Private 1, Commercial 1a, 10)
- Oregon Department of Agriculture (1 Credit, Other)
- Pennsylvania Department of Agriculture (2 credits each: 00, PC, 02, 18)
- Tennessee Department of Agriculture (1 CEU in 1, 4, 10, 12)
- Washington State Department of Agriculture (1 credit)
- West Virginia Department of Agriculture (2 Credits in Categories 1, 11, 12, and private applicator)
It is accredited for licensing categories: PCAs, Qualified Applicators, Private Applicators, Aerial Applicators, and County Permit Holders.
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