Answered for Sheridan, Hamilton County.
Still active. It's why mature American elms are rare here now, and why the ones that survive are worth protecting. 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 rapid one-season decline usually means removal.
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.
Flagging — one branch yellows and wilts while the rest looks fine — then rapid decline through the crown.
A rapid one-season decline usually means removal. Fungicide injection can protect a high-value elm that isn't yet infected, but it does not rescue one that is well along.
Preventive injection every two to three years, before symptoms.
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Distance measured from Sheridan.