See attached photo lower right for a strange growth on a Frontenac grapevine...

Asked July 13, 2017, 1:39 PM EDT

See attached photo lower right for a strange growth on a Frontenac grapevine that I am training to an overhead trellis Any idea what this is and should I cut it off? Also any idea why the Frontenac leaves are turning yellow while the grapes appear to be fine

Portage County Ohio grapevine

1 Response

Hi There, The strange growth may be caused by an insect. I would just cut it off since it is a rare occurance. The yellowing on the leave may be magnesium deficiency, if it is on older leaves. I would apply magnesium sulfate. It could be iron deficiency, if the yellowing is on newer or young leaves. I would apply iron sulfate. Hope this helps.