The emerald ash borer is a highly destructive insect that was first discovered in Canada in the summer of 2002. Its presence in the National Capital Region was detected for the first time in 2008, and the NCC’s management efforts began in 2009.
This insect has killed millions of ash trees in Canada and the United States, and poses a major economic and environmental threat to urban and forested areas in both countries. The impact of tree mortality has been devastating to the local tree cover, especially in areas where the density of ash trees is high.
In the National Capital Region, ash is a prolific native species that grows in many environments, including naturalized and more managed park environments.
The majority of the ash trees on NCC lands have been affected by the emerald ash borer. In 2018–2019, the NCC will be allocating over $3 million toward effective management of the emerald ash borer, bringing the total invested over the past decade to more than $8 million.
In working to find the best balance between conservation and health and safety, we have undertaken the following actions to address the impacts of the emerald ash borer.
Note: In order to preserve mature ash trees, injections of TreeAzinTM, a systemic insecticide produced from extracts of neem tree seeds (Azadirachta indica), are used in some core urban parks where ash trees have high economic and environmental value.
Residents of the Capital Region can also find more information on these websites: