Answered for Cumberland, Marion County (town limits extend east and north into Hancock County) County.
Confirmed in Indiana and spreading, though not yet the everyday problem it is further east. Worth reporting a sighting to the state rather than just treating it. 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. Damages rather than kills most trees, but the honeydew and mould make a yard unusable.
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
Grey egg masses that look like smeared mud, sticky honeydew and black sooty mould underneath the tree.
Whether the tree can be saved
Damages rather than kills most trees, but the honeydew and mould make a yard unusable.
Timing in Marion County (town limits extend east and north into Hancock County) County
Scrape egg masses in winter; treat nymphs in spring.
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