Blackberry – Stem Gall

Q: I found this on my blackberry plant and thought you might know what it is. Should I remove it?

A: I think it is a stem gall caused by the egg laying accomplished by a midge insect. Galls typically do not hurt host plants, they simply serve as a protected place for immature insects to develop.

You can leave it in place or remove it and cut it open to see what’s inside.