Invasive emerald ash borer has reached Portland, dooming ash trees

An invasive, tree-killing pest has made its way to Portland, spelling trouble for the many native ash trees that cool residential neighborhoods on hot summer days.

On Wednesday, Oregon forestry officials announced the discovery of an emerald ash borer infestation in the Hazelwood neighborhood in Northeast Portland, in the parking lot of the David Douglas Aquatic Center. The affected trees will likely have to be removed.

The emerald ash borer is an iridescent green beetle that made its way to the U.S. from Asia in 2002, first decimating ash trees across the Midwest. Many tree experts say it’s not a matter of if, but when Oregon’s ash trees endure a similar fate.

Oregon ash trees not only provide critical shade to residential neighborhoods — they also line many of the creeks, streams an