Concord Grape Pest Identification (links to pictures too!)

Hi,

I recently visited home where my father has started growing concord grape vines (for the past 3 years). The vines are up and doing well, and there have been plenty of grapes so I suppose the plants are healthy, but this year we noticed an odd affliction on the leaf and stem structure.

We aren't sure if they are caused by an infection or parisite and haven't had any luck online finding out what they are. If anyone could look at the images and identify our problem that would be most helpful!

Thanks!

The pictures are on my website at www.vibrial.com/grape/

Particularly look at these the top, bottom, and stem shots.

Thanks again!

 

Grape tumid gallmaker.
See:

http://www.nysipm.cornell.edu/factsheets/grapes/pests/gtg/gtg.asp
Grape Tumid Gallmaker

Ralph

 

Thanks!