Early downy mildew symptoms on Catawba - What's happening in the field?

What's happening in the field?

At the Missouri State Fruit Experiment Station

Early downy mildew symptoms on Catawba

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I saw what I think to be early downy mildew symptoms on Catawba. We will have to keep an eye on it.

Possible early downy mildew symptoms on Catawba grape
Possible early downy mildew symptoms on Catawba grape