It could be black rot. Mine had it earlier in the season. I picked off every leaf and grape with symptoms. Mine went on to do well until the 5th heatwave. The drought, 100+ temps, and my lack of watering led to all the grapes falling off. Look up black rot. That might be the problem.

Here is a link that might be useful: My grapes with black rot and other garden pictures

where can i find a nursery thats sells bareroot peach trees? What nurseries ship via c.o.d payment

The grapes are still green, but there are some black, shriveled, dry ones that fall off to the touch in each clump.

===>>> am i reading this right.. you are thinking about destroying the whole plant .. because a few of the grape on a given bunch aborted ...

jimminey ...

any chance at a picture????

since its your first crop.. i suggest you at least wait until the rest of the bunches mature.. and see what you get ....

let me tell you one thing... you will NEVER grow grapes.. like you see in the store ... [especially growing them on the ground] ... and once you get that preconceived notion out of your head .... i suspect you will be very happy with what you do get .... they dont have to be pretty to be homegrown and tasty ....

as to grapes2006 ... start your own post.. as your question has nothing to do with this post

ken

Ken,
I grew grapes successfully for many years at our former house, but this is the first time I planted any here. I realize they aren't like the store varieties, but planned to juice most of them. I have also heard that Canadice are great dehydrated. But if they have some virus or something that isn't curable, I would rather rip them out and nip it in the bud, especially if it might affect my 53 blueberry bushes. Hopefully we will get the trellis built soon.
Northwoodswis

I still think you should look into black rot. The variety I got it on this year was Reliance. It is something you can manage if you're willing to discard diseased berries and foliage as symptoms pop up. You mentioned that the soil dries out quickly. Water stress could make plants more susceptible to diseases. I would try and water the soil, not the foliage, when it starts to get dry.

Not seeing anything like that on my Reliance grapes. Mine are just blushing purple right now. We've actually starting eating them because last year we waited until they were completely purple and my wife didn't like them because they were too sweet (she won't eat purple store bought either, just green). My vine (4 or 5 years old now) is loaded with bunches of grapes and is almost on the roof. I really need to chop it back hard and put up a proper trellis.