What is making holes in leaves of plum tree?

young codger

Something is making holes in the leaves of my plumb tree. I'm unsure if it is the sun or an insect. Is it possible to tell from the photos?

BobTheGardener

I can see some brown spots, so I suspect it's shot-hole cause by bacterial canker, unfortunately:

https://www.rhs.org.uk/advice/profile?pid=86

I have it on 3 of my plum trees too.

young codger

Ok Bob, thanks for your advice. I'll get some wound paste, then prune the affected areas.