Answered for Brownsburg, Hendricks County.
Common under aphid-infested maple and linden in mid-summer. In Brownsburg, no published species-level street tree inventory exists for Brownsburg, so exact species counts are UNVERIFIED; what is documented is that the town replants under an approved street-tree list in Town Code Sec. 96.20, so the street canopy skews young and town-selected rather than volunteer-grown. The one region-wide certainty is that ash is effectively gone from the mix after emerald ash borer moved through Indiana. Harmless in itself — it grows on the honeydew, not on the tree.
No published species-level street tree inventory exists for Brownsburg, so exact species counts are UNVERIFIED; what is documented is that the town replants under an approved street-tree list in Town Code Sec. 96.20, so the street canopy skews young and town-selected rather than volunteer-grown. The one region-wide certainty is that ash is effectively gone from the mix after emerald ash borer moved through Indiana.
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.
8446 N State Rd 267, Brownsburg, IN 46112
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5050 Freyn Dr, Indianapolis, IN 46254
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5340 W 79th St, Indianapolis, IN 46268
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6565 Coffman Rd Bldg D, Indianapolis, IN 46268
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Distance measured from Brownsburg.