The Rise and Fall of Dover's Ash Trees

In this episode of the Dover Download podcast, Deputy City Manager Christopher Parker chats with Makayla Edgecomb, Assistant City Planner for the City of Dover, and Lindsay Watkins, Strafford County Forester with the University of New Hampshire's Cooperative Extension, about the critical issue facing Dover's downtown ash trees.

The conversation centers on the emerald ash borer, an invasive beetle from Asia that has devastated ash tree populations across the Midwest since the early 2000s and has now reached Dover. The beautiful, shiny green beetle lays eggs in ash tree bark, and its larvae burrow into the tree's growth tissue, eventually cutting off the flow of nutrients and water. This process kills the tree from the top down, creating visible signs like branch dieback and woodpecker damage.

Dover's Central Avenue is lined with approximately 54 ash trees, all of which are infected and in decline. While some treatments exist for high-value trees, they are expensive and must be repeated regularly. For Dover's street trees, replacement is the only viable option. The city plans to phase the removal and replanting to avoid clearing the entire avenue at once, and will diversify tree species to prevent future monoculture vulnerabilities.

The guests organized public ash tree walks to educate residents about the problem and gather input on replacement planning. A second walk is scheduled for Aug. 21 at 6 p.m., starting at City Hall and ending at Garrison City Beer Works for community feedback on the downtown's future canopy.

In This Week in Dover History, we learn about Dover's 1982 downtown renovation when the city planted over 150 ash trees along Main Street as part of a broader beautification effort, planting the very trees now threatened by the emerald ash borer.