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Grapes have white on them #875336
Asked June 30, 2024, 12:08 PM EDT
Stearns County Minnesota
Expert Response
https://www.canr.msu.edu/ipm/diseases/powdery_mildew
This reply to a similar question discusses the problem and what to do about it.
https://ask2.extension.org/kb/faq.php?id=873577