Answered for Carmel, Hamilton County.
Common on stressed honey locust and on trees with mower or string-trimmer damage at the base — which is a genuinely avoidable cause. 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. A canker that has girdled more than about half the trunk circumference is structural, not cosmetic.
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.
Sunken dead patches on bark, sometimes oozing, often with cracked margins. Branches above the canker die back.
A canker that has girdled more than about half the trunk circumference is structural, not cosmetic. Small branch cankers can be pruned out; trunk cankers usually can't.
Prune out affected branches in dry weather, well below the canker.
152 Lotus Dr Apt 1, Carmel, IN 46032
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111 Shoshone Dr, Carmel, IN 46032
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14500 Dublin Dr, Carmel, IN 46033
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14706 Harvest Dr, Carmel, IN 46032
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4621 E 146th St, Carmel, IN 46033
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10503 Becker Ct, Fishers, IN 46038
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Distance measured from Carmel.