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Grapes have white on them #875336

Asked June 30, 2024, 12:08 PM EDT

Hi, trying to figure out what is going on with our grapes. They were looking so good but now are getting white on them. We just have a couple of plants. They are either Valiant or Marquette variety of grapes.

Stearns County Minnesota

Expert Response

The grapes appear to be affected by powdery mildew.  Compare here:

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
An Ask Extension Expert Replied June 30, 2024, 12:52 PM EDT

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