Holes in Trunk of Crabapple Tree

I have a crab apple tree that gave a bumper crop of apples this year so I was very concerned to see rows of holes in the trunk – what are causing these and should I be concerned? Thank you!…

Sick Crabapple Trees in Toronto

I was away during the summer and when I returned, two weeks ago, I noticed that a crabapple tree on my front lawn (Leaside) has little foliage (it was normal in May) and the trunk has holes in it made…