Leaf galls on wild grape

Asked June 30, 2018, 12:50 PM EDT

removing wild grape from an old lilac this morning- second go round for the season, I found two leaves that had these odd spike growth on them that I've never seen on my regular grapes or any of the other wild grapes around in the forest. You have one picture that is similar though your spikes are pinkish while these are yellow/green.

New Castle County Delaware

1 Response

Those are galls. There are several insects that cause galls in plants. The insect is closely associated with the plant, so similar galls on different plants are caused by different insects. That shape gall is called a spindle gall.