While beginning my spring clean up I have discovered a boring insect has wreaked havoc in my landscape as noted in some of the photos below. These shrubs were scattered throughout my property so it appears this is a wide spread problem. I have been poking through my insect books as well as notes from UMass Extension and have come up empty handed. There are multiple boring suspects and I am not sure even if I identify the culprit if there will be a solution. Has anyone had a similar problem?
The Viburnums might be a different issue but these were mature plantings that were not under any type of stress. Any advise on how to do an autopsy?
Tree Peony *note holes bored into branch
Acer palmatum 'Waterfall' *note holes bored into trunk
Viburnum x burkwoodii *trunk did not note bored holes.
black pine insect bored into trunk
Viburnum dilatatum note rotting-splitting trunk without signs of boring