Answered for Beech Grove, Marion 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 Beech Grove, beech Grove is one of only 23 Indiana communities in the DNR's 2008 i-Tree STRATUM street tree sample inventory, and its numbers are extreme: of 1,699 inventoried street trees, silver maple was 33.1% — more than triple the 10%-per-species industry guideline — followed by Callery pear 11.5%, apple 10.1%, sugar maple 5.0% and littleleaf linden 5.0%. Those top-heavy silver maples on small lots are the recurring job here. A canker that has girdled more than about half the trunk circumference is structural, not cosmetic.
Beech Grove is one of only 23 Indiana communities in the DNR's 2008 i-Tree STRATUM street tree sample inventory, and its numbers are extreme: of 1,699 inventoried street trees, silver maple was 33.1% — more than triple the 10%-per-species industry guideline — followed by Callery pear 11.5%, apple 10.1%, sugar maple 5.0% and littleleaf linden 5.0%. Those top-heavy silver maples on small lots are the recurring job here.
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.
1138 S Drexel Ave, Indianapolis, IN 46203
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269 N Shortridge Rd Apt 3, Indianapolis, IN 46219
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Distance measured from Beech Grove.