Answered for Danville, Hendricks County (county seat) County.
Common under aphid-infested maple and linden in mid-summer. In Danville, the Main Street Historic District developed circa 1844–1920 across just 9 acres and 37 contributing buildings, and the Courthouse Square district circa 1865–1960 over 70 acres — those blocks hold the town's oldest and largest trees on narrow lots with sidewalks on both sides. Danville does actively manage its right-of-way canopy through a standing Tree Advisory Committee, though the specific inventory and replanting-ratio requirements attributed to Chapter 97 could not be verified. Harmless in itself — it grows on the honeydew, not on the tree.
The Main Street Historic District developed circa 1844–1920 across just 9 acres and 37 contributing buildings, and the Courthouse Square district circa 1865–1960 over 70 acres — those blocks hold the town's oldest and largest trees on narrow lots with sidewalks on both sides. Danville does actively manage its right-of-way canopy through a standing Tree Advisory Committee, though the specific inventory and replanting-ratio requirements attributed to Chapter 97 could not be verified.
Black soot-like film on leaves, branches, cars and patio furniture below the tree.
Harmless in itself — it grows on the honeydew, not on the tree. It is a symptom. Treating the mould achieves nothing; find the aphids or scale above it.
Deal with the insect, and the mould weathers off.
240 Old North Salem Rd, Danville, IN 46122
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1078 IN-236, Danville, IN 46122
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1502 S County Rd 525 W, Danville, IN 46122
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4883 Gibbs Rd, Plainfield, IN 46168
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278 N East St, Plainfield, IN 46168
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7701 S County Rd 375 E, Mooresville, IN 46158
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Distance measured from Danville.