Detection and delimitation of emerald ash borer on Canada’s west coast

Over the past 30 years emerald ash borer has successfully invaded eastern North America and parts of eastern Europe following colonization of both regions in the 1990s.Western North America has been spared invasion by this species until recently when a population was found in Oregon.Here we document the interception and successful delineation of an emerald ash borer population in Vancouver, Canada following a fortuitous detection by a member of the public.The detection is also the first outside the native range of ash in North America.