It is a little early to be concerned about powdery mildew, but this article just came out on early-season powdery mildew identification. Brooke Warres, a graduate student in the University of Georgia Plant Pathology Department, is a co-author on this article. You might tag it for later.

https://www.goodfruit.com/early-season-scouting-for-grape-powdery-mildew/

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