Similar problems for my two grapes at San Diego, California. See the two photos. We used some insecticides, so far not much help.

Would appreciate any suggestions. BTW, could not find a grape forum, see posted here.

Look up Botryis...

Grape leaves are notorious for this and I think there are plenty of good systemics or topicals for this,,I would call a grape vine grower how they deal with it or what safe product they use or ask in this in the disease forum...

MIke

Check this out, click link.

I have the same problem and loose over half my crop on bad years. Thanks mike, knowing its proper name I found a good link to look over

Here is a link that might be useful: http://www.practicalwinery.com/MarApr07/marapr07p30.htm

Fruits & Orchards Forum can help you out with any grape questions.

Patty S.

Here is a link that might be useful: Garden Web Fruits & Orchards Forum

looking for help with for controlling this

What Patty said)

MIke

sulfur dusting is the simplest control; most commercial vineyards do it often during the growing season.