Every year I get a handful of grapes that look like they have scabs on them. I'll get a pic tomorrow when the sun is out, but imagine a green, immature grape, with a patch of what looks like .... ok if you get a really bad sunburn, you know how the skin goes brown and cracks just before it peels? That's what these little patches look like. I don't think it's sunscald because the ones that get it are not the ones that get the most sun. I googled for scabby grapes but never found any photos like it. I'm seeing it exclusively on the Marquis, if that helps. Could it be some sort of fungus causing that? I don't think I have an issue with dampness; hot dry winds tend to keep everything aired out well. Added: photo. not the greatest, the phone dislikes closeups. The scabby part doesn't spread and it doesn't appear on the vine or leaves.