Answered for Cumberland, Marion County (town limits extend east and north into Hancock County) County.
Still active. It's why mature American elms are rare here now, and why the ones that survive are worth protecting. In Cumberland, the biggest and oldest trees stand in Old Town along US 40, over houses on a corridor continuously settled since 1831 — that is where a crew will meet 100-plus-year specimens with structures under them on both sides. Buck Creek carries the bottomland canopy, the east-side Hancock County subdivisions date from the 1970s through the 2000s and their canopy is mid-life, and ash has been removed across central Indiana by emerald ash borer; no published street-tree inventory exists for the town. A rapid one-season decline usually means removal.
Cumberland's canopy and what's at risk
The biggest and oldest trees stand in Old Town along US 40, over houses on a corridor continuously settled since 1831 — that is where a crew will meet 100-plus-year specimens with structures under them on both sides. Buck Creek carries the bottomland canopy, the east-side Hancock County subdivisions date from the 1970s through the 2000s and their canopy is mid-life, and ash has been removed across central Indiana by emerald ash borer; no published street-tree inventory exists for the town.
What to look for
Flagging — one branch yellows and wilts while the rest looks fine — then rapid decline through the crown.
Whether the tree can be saved
A rapid one-season decline usually means removal. Fungicide injection can protect a high-value elm that isn't yet infected, but it does not rescue one that is well along.
Timing in Marion County (town limits extend east and north into Hancock County) County
Preventive injection every two to three years, before symptoms.
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