A dying or thinning ash tree in St. Louis
Have a declining ash assessed before committing to recurring treatment or removal. The tree’s remaining condition matters as much as identifying the insect.
Updated November 2, 2026
What might be happening?
Missouri Botanical Garden documents EAB in St. Louis City and describes upper-canopy dieback, D-shaped exit holes and woodpecker damage as possible signs. It notes that woodpeckers can expose lighter bark while searching for larvae.[10]
What to tell the arborist
Record where thinning began, whether the bark looks newly stripped, and any previous treatment dates. Take whole-tree and accessible bark photos from the ground without peeling bark away.
The next step
Ask an arborist to assess canopy condition and whether protecting this tree is realistic. Read our treat-or-remove guide before discussing a longer-term plan.
What not to assume
Missouri Botanical Garden says treatment is more effective on healthier trees and is a recurring commitment. Heavily damaged trees may not recover even if treated; there is no blanket promise that an ash can be saved.[10]
This is general guidance, not a diagnosis. Your arborist confirms the cause and treatment suitability on site; some concerns also need laboratory confirmation.
Immediate danger from a tree or hanging limb? See 24/7 storm help. Stay away from downed lines and anything touching them; call the utility for electrical hazards and 911 for injuries.