The City of Vancouver is injecting ash trees with a pesticide as it looks to deal with the invasive emerald ash borer beetle, a species responsible for millions of ash tree deaths across the continent.

The pest, native to northeastern Asia, including China, Korea, Japan, Mongolia, and parts of the Russian Far East, was first detected in Vancouver last year by the Canadian Food Inspection Agency (CFIA), prompting concerns for thousands of urban trees in the city.

It likely arrived in North America…