Rose galls.

[Trent Watts]

While out looking for insets to photograph I noticed these galls on some wild roses. My friend is an entomologist that did his PhD on rose galls. I sent these images to him and this is his response. (Thanks Joe).
These are galls of the cynipid wasp Diplolepis bicolor and they are found on Rosa woodsii on the prairies. In Ontario, we have Rosa blanda as the host as R. woodsii is not found here. That the wasps accept both hosts is an indication that the host roses are related or maybe the plant taxonomists were wrong and they are the same species.

 

[Michael13]

They appear ready to defend themselves!

Top notch photography, as usual! I like the softer light in the first image.

 

[AlanLichty]

I certainly would not have guessed what we are looking at here. Glad your friend was knowledgable on the subject matter

 

[JimFox]

Thanks so much Trent for the education. That's news to me. And great images of them.