Answered for Beech Grove, Marion County.
It has already moved through Indiana and killed the overwhelming majority of untreated ash. An untreated ash here is on a clock, not at risk. 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. Treatable while the canopy is still mostly intact.
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.
Thinning from the top down, D-shaped exit holes about an eighth of an inch across, sprouts low on the trunk, and pale flecking where woodpeckers have stripped bark to get at larvae.
Treatable while the canopy is still mostly intact. Once roughly a third of it is gone, treatment stops being worth the money and the tree becomes a removal — and a dead ash goes brittle unusually fast, which makes it both more dangerous and more expensive the longer it stands.
Trunk injection in spring or early summer, repeated every one to two years for the life of the tree. It is a permanent commitment, not a cure.
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Distance measured from Beech Grove.