these are only on the bottom side of leaves , they are on a few of the concords and on the beta . worried this might spread to some of the 30 other vines !
Grape Phylloxera, "Leaf galls are formed on French-American hybrids, Concord juice grapes and some rootstocks", see http://www.agf.gov.bc.ca/cropprot/grapeipm/phylloxera.htm
Thank for reply ! Is there any remedy ? Or do the roots and vines have to be removed ? The article is good but not very informative on remedy or outcome .
