Answered for Sheridan, 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 Sheridan, community Park is singled out in the town's comprehensive plan for its numerous old-growth trees, and the pre-1970 residential grid around it carries matching full-size shade trees. New subdivisions plant only from the UDO's approved street-tree list — columnar Norway and hedge maples, black gum, disease-resistant Asian elm hybrids, European and American hornbeam, male "Autumn Gold" ginkgo and golden rain tree — a list that pointedly contains no ash and no Callery pear. A canker that has girdled more than about half the trunk circumference is structural, not cosmetic.
Community Park is singled out in the town's comprehensive plan for its numerous old-growth trees, and the pre-1970 residential grid around it carries matching full-size shade trees. New subdivisions plant only from the UDO's approved street-tree list — columnar Norway and hedge maples, black gum, disease-resistant Asian elm hybrids, European and American hornbeam, male "Autumn Gold" ginkgo and golden rain tree — a list that pointedly contains no ash and no Callery pear.
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.
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Distance measured from Sheridan.