Have you seen wasps on the grapes? I haven't heard of them actually working un-blemished grapes. I've seen them when those tiny birds peck a hole in a grape, but not attack a grape themselves.

If they just disappear completely, then I'd suspect raccoons.

/like what just happened to my peaches. :-(

Probably not racoons. There aren't a whole lot of them around and they would probably leave tell tale signs.

I suppose I'll need to inspect closer. So far this year very few wasps have been around the metro area. But the last 2 years there were huge amounts of wasps around especially in my garden.

Once my grapes are fully ripe, the wasps are horrible!!! You can't even get near them in the heat of the day. We have to wait until dusk when they head back to their nests for the night to harvest them. They don't seem to be interested in them until ripe though.