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This historic American Elm known as the 'Quad Elm' on UPenn's campus will be removed in the next month or so. The tree has been declining for years, despite exhaustive efforts from many Penn staff and master arborists in the area. The tree has been treated for DED and Bacterial Leaf Scorch. It also tested positive for Elm Canker (Botryodiplodia hypodermia) after samples were sent to a lab via John B. Ward tree services - https://wiki.bugwood.org/HPIPM:Botryodiplodia_hypodermia
The disease normally affects Siberian Elms. Much of the tree's crown has died, and it was decided that it should be removed. The last two photos are of the tree before it began to decline. The third photo is of a report from John B. Ward tree services confirming positive test results of Botryodiplodia.