Is my american elm dying or just stressed?
Flagging is the signature symptom: one branch or one section of the crown yellows, wilts and browns while the rest of the tree stays fully green, usually starting high in early summer. Peel the bark on a wilting branch — brown streaking in the outer sapwood points to Dutch elm disease, while butterscotch-brown discolored inner bark at the trunk base points to elm yellows, and that distinction decides everything, because early single-branch DED can sometimes be pruned out and injected while elm yellows has no treatment.
Why american elm ends up on a quote here
Dutch elm disease took the street elms but the species never left central Indiana — it seeds aggressively, so volunteer elms are everywhere and they grow well right up until they are big enough to interest the bark beetles. What homeowners actually see is a decent thirty-to-forty-foot shade tree that flags one branch in June and is dead inside a season or two.
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