Answered for Shelbyville, Shelby County.
Common under aphid-infested maple and linden in mid-summer. In Shelbyville, shelbyville is the only town of its size around here with real canopy data coming: the Planning Department hired Davey Resource Group under an Indiana DNR grant to inventory every tree on city property and in the public rights-of-way from April through Memorial Day 2025, recording species, size and health, flagging invasives, and marking dead or hazardous trees and stumps for removal. Age tracks the housing rings — full-size canopy over the 1853-1939 Westside and the 1950s additions, and by inference much younger stock on recently annexed ground north of the city — with ash functionally absent after emerald ash borer reached all 92 Indiana counties by 2017. Harmless in itself — it grows on the honeydew, not on the tree.
Shelbyville is the only town of its size around here with real canopy data coming: the Planning Department hired Davey Resource Group under an Indiana DNR grant to inventory every tree on city property and in the public rights-of-way from April through Memorial Day 2025, recording species, size and health, flagging invasives, and marking dead or hazardous trees and stumps for removal. Age tracks the housing rings — full-size canopy over the 1853-1939 Westside and the 1950s additions, and by inference much younger stock on recently annexed ground north of the city — with ash functionally absent after emerald ash borer reached all 92 Indiana counties by 2017.
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.
11219 House St, Indianapolis, IN 46259
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4621 S Brooklawn Dr, New Palestine, IN 46163
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201 S Morton St, Franklin, IN 46131
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2067 Sunshine Dr, Greenfield, IN 46140
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646 S 600 W Building #5, New Palestine, IN 46163
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5067 W US Hwy 40, Greenfield, IN 46140
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Distance measured from Shelbyville.