Need to ID grape disease

Athens, OH

My grapes, some purple variety, are being taken over clump by clump. It started about a week ago.

Please help.
Do you recognize the disease?
What is the treatment?

Many, many thanks.
ROX

Here's a picture of one of the infected clumps.

Thumbnail by rox_male
Athens, OH

Here is a picture of one of the grapes.

Thumbnail by rox_male

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