strange growth on my grape vine.

bettybop(3)July 30, 2013

My grapevine has this strange growth all over the leaves. They look like grapes growing on the leaves. and there is a little white residue on the back, the leaves completely roll closed. I have posted a picture of it. Growths seem to be more on the newer leaves. has anyone seen this before or knows what it is?
thank you
bettybop

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jean001a(Portland OR 7b)

Look like insect galls.

    Bookmark   July 30, 2013 at 4:10PM
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jean001a(Portland OR 7b)

Uh oh, may be Grape Phylloxera, Daktulosphaira vitifoliae. If so. bad news

Here's info & images from Ohio State
http://www.oardc.ohio-state.edu/grapeipm/insects_attacking_grape_foliage.htm
you'll need to scroll down the page a bit.

Suggest you contact your county's extension service office to determine if the above is corset and how they suggest you manage it.
http://www.csrees.usda.gov/Extension/

Here is a link that might be useful: locate your county's Extension Service office

    Bookmark   July 30, 2013 at 4:15PM
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