I use Bonide - as in the picture you posted - for curly leave on my peaches. I'd say give it a try. I also use it in winter for my vines to control powdery mildew on the vine trunks.
Yes! I have grass around it and did a little weed and feed a few weeks ago. I tried to make sure none got on the vines….Did any herbicide get used near your grapes?
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