Answered for Plainfield, 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 Plainfield, the most age-mixed canopy of the three: a genuine 1950s ring plus the pre-1900 Quaker core along Main Street (US 40) carries 60-to-90-year-old shade trees over the street, while Saratoga, Sugar Grove Farms and Legacy Farms hold 10-to-25-year-old planted stock, and the White Lick Creek bluffs hold the town's only real remnant woodland. Ash is gone here as everywhere in Indiana. Treatable while the canopy is still mostly intact.
The most age-mixed canopy of the three: a genuine 1950s ring plus the pre-1900 Quaker core along Main Street (US 40) carries 60-to-90-year-old shade trees over the street, while Saratoga, Sugar Grove Farms and Legacy Farms hold 10-to-25-year-old planted stock, and the White Lick Creek bluffs hold the town's only real remnant woodland. Ash is gone here as everywhere in 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 Plainfield.