Grape gall

Asked July 27, 2018, 10:59 AM EDT

I found this on my grape vine but can't find any pictures online of what it might be?

Isabella County Michigan

3 Responses

That is a gall formed by an insect.
It is pretty rare.
I have seen this one a couple times in 25 years working with grapes.
Just a curiosity, not anything to lose sleep over.

Thank you for responding. The leaves did have the little gall balls on them, but this "thing" (to the far right on top of the bird feeder) is about 2 1/2" in diameter and height... How can an insect make something so big? How does it make the spikey ends. My husband cut it open and did not see any eggs.

No it is an insect gall. The answer was not very satisfactory to me as well so I asked our grape insect specialist.
He suggested hazelnut gall caused by a cecidomyiid fly. I found a picture of a filbert gall on the internet which was the same as your mystery gall.
I too have cut the galls in half looking for the culprit