No takers on this thread so far. I thought people would jump all over it...but I guess not. Any ideas? See here: http://davesgarden.com/forums/t/608304/
Grapes - see if you can figure it out
You have a fungi infection, probably black rot. It can be control with timely applications of fungicide. The oldest being Bordeau mixture. http://www.canr.msu.edu/vanburen/e-1732.htm
Cool...that looks like my problem. Thanks. Probably too late to treat at this point I guess? (so the fruit doesn't shrivel up)
May not help you with a crop this year, but you can start treatments now so that your vine can be healthy and store up energy for next year
I get that on my leaves every year and it has no effect on the grapes at all. I wonder why? I'm growing local grapes that are pretty much a weed around here so maybe their just naturally protected.
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