Ash tree threat changes landscape
Campus landscape is being mapped with GIS tech
Details about thousands of trees and shrubs are being recorded as part of an ongoing effort to electronically map the campus landscape.
Iowa State was proactive in preparations for the emerald ash borer, a metallic green beetle that is working its way across the United States and killing all ash tree species along the way. Part of the plan was reducing the number of ash trees on campus by about 560 -- a drop from 20% to 7% of the total tree canopy -- from 2007 to 2018. About 600 ash trees remain, 75 of which are being treated against infestation.
Rhonda Martin, landscape architect in facilities planning and management, said 683 trees were planted to replace the ash removals. Of the 38 tree varieties planted, the majority are from nine varieties: tuliptree, black gum, Kentucky coffeetree, honeylocust, hackberry, ginkgo, American yellowwood, linden and elm.
Martin said the campus canopy includes some species rare to Iowa. Her favorite is the Japanese stewartia in the courtyard of Lagomarcino Hall. Other unique trees include nine of the biggest for their species on record in Iowa:
- Black tupelo
- Chinese lilac tree
- Eastern wahoo
- English oak
- Katsura tree
- Lacebark pine
- Paperbark maple
- Yellow birch