Answered for Brownsburg, Hendricks 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 Brownsburg, no published species-level street tree inventory exists for Brownsburg, so exact species counts are UNVERIFIED; what is documented is that the town replants under an approved street-tree list in Town Code Sec. 96.20, so the street canopy skews young and town-selected rather than volunteer-grown. The one region-wide certainty is that ash is effectively gone from the mix after emerald ash borer moved through Indiana. Treatable while the canopy is still mostly intact.
No published species-level street tree inventory exists for Brownsburg, so exact species counts are UNVERIFIED; what is documented is that the town replants under an approved street-tree list in Town Code Sec. 96.20, so the street canopy skews young and town-selected rather than volunteer-grown. The one region-wide certainty is that ash is effectively gone from the mix after emerald ash borer moved through Indiana.
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 Brownsburg.