Answered for Carmel, Hamilton County.
Common under aphid-infested maple and linden in mid-summer. In Carmel, carmel Urban Forestry publishes an approved species list (last revised 3/28/2024) whose "Undesirable Trees" section reads like a field guide to what fills older Hamilton County streets: silver maple (shallow roots, weak wood), Callery pear, pin oak, red maple and all Fraxinus for emerald ash borer. Approved large street trees run to swamp white oak, bur oak, chinkapin oak, hackberry, male-only ginkgo, thornless honeylocust, Kentucky coffeetree, baldcypress and London planetree; note Callery pear is discouraged locally but is not yet banned in Indiana — 312 IAC 18-3-25 currently lists 44 species without it. Harmless in itself — it grows on the honeydew, not on the tree.
Carmel Urban Forestry publishes an approved species list (last revised 3/28/2024) whose "Undesirable Trees" section reads like a field guide to what fills older Hamilton County streets: silver maple (shallow roots, weak wood), Callery pear, pin oak, red maple and all Fraxinus for emerald ash borer. Approved large street trees run to swamp white oak, bur oak, chinkapin oak, hackberry, male-only ginkgo, thornless honeylocust, Kentucky coffeetree, baldcypress and London planetree; note Callery pear is discouraged locally but is not yet banned in Indiana — 312 IAC 18-3-25 currently lists 44 species without it.
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.
152 Lotus Dr Apt 1, Carmel, IN 46032
“Romeo and his crew did a fantastic job for us! Trimmed back two large red maple trees that were very overgrown, cut down a pine tree and ground up…”
Alex Miller · 2 months ago · Google
111 Shoshone Dr, Carmel, IN 46032
“I got a few quotes but Chris from Carmel Tree Service gave me the best bid by far on the job. They showed up right on time with all the heavy duty…”
John Gibson · 3 months ago · Google
14500 Dublin Dr, Carmel, IN 46033
“I have no words and I am truly speechless at the work Roger and his crew did on my home! I received a few quotes and not only was Roger competitive…”
David M. Johnson · 2 months ago · Google
14706 Harvest Dr, Carmel, IN 46032
“Anthony and his team did an excellent job of removing multiple trees in my back and side yard, along with stump grinding. They also did a bunch of…”
Frances Russell · 4 months ago · Google
4621 E 146th St, Carmel, IN 46033
“The entire staff is great to work with and, while they are a bit expensive, they do careful work and are extremely professional. In a previous…”
David Morris · a month ago · Google
10503 Becker Ct, Fishers, IN 46038
“I highly recommend Stumped LLC. Karl was very prompt at returning my online inquiry even though it was a busy time. He came out and gave me a…”
Christy Garner · 5 years ago · Google
Distance measured from Carmel.