I know trimming grapes in summer stimulates growth--but is that just more shoots or more clusters, too? I need to do it soon.

Also, I'm thinking to try a vinegar/baking soda mixture to prevent black rot from spreading. It works very well for my roses and black spot. Anyone ever tried this?

Lovesblooms have you tried milk as a fungicide?

http://www.abc.net.au/gardenin...

I tried that last year for downy mildew-infected impatiens but it didn't seem to have much effect and used enough milk per gallon that I foresaw it becoming expensive for our large milk-drinking household... but the baking soda/vinegar mix works very well for every black-spotted rose I've sprayed it with. I haven't had reason to spray it on anything else yet, though.