rj3392's picture

Growth on tree

Observed: 15th January 2012 By: rj3392
S159 Neighbourhood Nature - course complete
rj3392’s reputation in Plants
Growth on tree
    Likely ID
    Crown Gall (Agrobacterium tumefaciens)
    Confidence: It's likely to be this, but I can't be certain.
Species interactions

No interactions present.


RHoman's picture


Such swellings are more likely to be burrs rather than the product of Crown Gall. Such features could be a response to damage or infection, but the latter does not necessarily have to be Agrobacterium tumefaciens.

Robert Homan

Refugee's picture

Little twigs

It does look like little twigs are growing out of it. I have also seen this on Birch. Both Oak and Birch do get Crown Galls on them. Certainly an infection.