Answered for Plainfield, Hendricks County.
Common under aphid-infested maple and linden in mid-summer. In Plainfield, the most age-mixed canopy of the three: a genuine 1950s ring plus the pre-1900 Quaker core along Main Street (US 40) carries 60-to-90-year-old shade trees over the street, while Saratoga, Sugar Grove Farms and Legacy Farms hold 10-to-25-year-old planted stock, and the White Lick Creek bluffs hold the town's only real remnant woodland. Ash is gone here as everywhere in Indiana. Harmless in itself — it grows on the honeydew, not on the tree.
The most age-mixed canopy of the three: a genuine 1950s ring plus the pre-1900 Quaker core along Main Street (US 40) carries 60-to-90-year-old shade trees over the street, while Saratoga, Sugar Grove Farms and Legacy Farms hold 10-to-25-year-old planted stock, and the White Lick Creek bluffs hold the town's only real remnant woodland. Ash is gone here as everywhere in 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.
278 N East St, Plainfield, IN 46168
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4883 Gibbs Rd, Plainfield, IN 46168
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7701 S County Rd 375 E, Mooresville, IN 46158
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7532 Brattle Dr, Camby, IN 46113
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9188 W County Line Rd, Camby, IN 46113
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240 Old North Salem Rd, Danville, IN 46122
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Distance measured from Plainfield.