Hi. I just bought several redtwig dogwood shrubs (cornus baileyi) that are in pots, and for the most part look very healthy. But scattered about them are some leaves that are either yellow, or have some holes in them, or both. A pic of a particularly bad leaf is attached.

I see no insects or scale or anything odd on the leaves otherwise.* I suppose the yellowing and the holes could be due to different causes?

Just curious if I should be intervening on this. Am in western PA. Thanks for any help.