Kris Edson, lead tree surgeon for Penn State's Office of Physical Plant, tied off branches of a diseased elm tree near Walker Building for removal on June 16. This summer, 16 elms will be removed from the University Park campus due to Dutch elm disease. Since 2007, nearly 100 of the campus' approximately 293 American elms have been lost to Dutch elm disease and elm yellows.

Drew Beben, left, and Corby Fetteroff of Penn State's Office of Physical Plant fed elm tree limbs into a shredder on June 16 during removal of a diseased elm near Walker building on Penn State's University Park campus. Sixteen campus elms will be removed this summer as the University continues to battle Dutch elm disease and elm yellows. Staff began planting diverse tree species this spring to replace elms lost to disease.

Kris Edson, lead tree surgeon for Penn State's Office of Physical Plant, cut off a high branch of a diseased elm tree marked for removal on June 16. Penn State has aggressively battled for years diseases affecting its landmark American elm stand, but this summer will remove 16 trees infected with Dutch elm disease.