I've just noticed many small holes in my ornamental crabapple tree. It seems to be some sort of wood boring insect as the holes are only in the trunk & larger branches. In many instances, there will be 3-5 very regularly spaced holes in a row. No other trees on the block seem to be effected including another smaller crabapple. The bark is also peeling back, like a paper birch tree and in early June, some leaves are turning yellow and dropping.
One, are these problems related? And secondly, do you know what type of insect is making the holes and how would I treat it. Thanks!