Is this canker on Populus tremula caused by this bacteria?
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
It looks right. In parts of the world where Poplar is grown for timber it can be a menace to put it mildly.
There are rather a lot of sickly looking trees in the background of your first photo.
I am no expert in these matters but there is insufficient evidence in the picture and Description for us to be certain. I came because this Observation is in the doldrums - no complete ID panel, no likely and, probably, in the wrong group.
Of course Xanthomonas is not in the UKSI Dictionary so the panel would never form. I wondered whether to offer a higher level ID but ran into difficulties breaching the Bacteria-Fungi barrier
Lat/Lng: 51.962317222222, -0.65524972222222
OS grid ref: SP924301