Our pear tree is now nearly leafless. The tips of the limbs are still green, as are the buds if I scratch into them. But, more concerning to me now is that I've discovered 5-6 of these guys running around on the trunk:
I know this is a native ash borer, and it likes dying trees. So, it would make sense that it's on our pear. That said, we have about a 12-14 year old purple ash in our back yard that we have grown from a stick, and my wife and I love this tree. It's a beautiful tree, about 25-30 feet tall now and providing much needed shade to our back yard.
I checked this evening, and it does have half a dozen small round (not D shaped) BB sized holes that are not hollow, but filled with what looks like fine sawdust. All of these are 5+ feet up the trunk in the softer bark part. I remember seeing these small holes in few numbers over the years, but this is the first time I've seen the insect to go with it and put 2 and 2 together. It also has about a 4 inch long vertical wound where the bark has split and come away maybe an inch at the most in width that I can see. It's not a nasty looking wound, just noticeable if you're looking for it. It's dark now, but I can get a picture tomorrow if this would be of interest. Otherwise, our ash is just beautiful and healthy looking.
I suspect our pear tree is dead, but our ash tree is still healthy. Can I trouble you guys for what I need to be doing now to protect our ash tree? Are these native borers not a problem unless our ash tree were to be distressed, or do I need to be taking measures and treating these guys as if they were emerald ash borers?
Thanks all for all the replies and feedback. I can't overstate my gratitude for the help.