Answered for Cumberland, Marion County (town limits extend east and north into Hancock County) County.
Very common here in wet springs, particularly on sycamore. One of the most over-treated problems in the trade. 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. Almost never fatal on an established tree.
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
Brown blotches along leaf veins, early leaf drop, sometimes twig dieback. Worst after a cool wet spring.
Whether the tree can be saved
Almost never fatal on an established tree. It looks alarming, the tree defoliates, and then it leafs back out. Most calls about it don't need a treatment at all.
Timing in Marion County (town limits extend east and north into Hancock County) County
If treated at all, at bud break — but raking and binning fallen leaves does more than spraying.
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