The emerald ash borer is about 1/2-inch long and smaller than the size of a dime. It has killed more than 100 million ash trees in the U.S. since its discovery in Michigan in 2002. It was discovered in Oregon in June.

Portland outlines plan to combat invasive tree-killing beetle

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Portland forestry officers are bracing for a significant die-off of ash timber as an invasive beetle spreads by means of the area.

The emerald ash borer, which is native to Asia, has killed greater than 100 million timber in the US since its discovery in Michigan in 2002, and Oregon officers have long-feared its arrival on the West Coast.

A Portland metropolis biologist found proof of the pest in June in Forest Grove.

Since then, the Portland Parks & Recreation Division has been working with Oregon’s Division of Forestry and Division of Agriculture to restrict the unfold.

Jenn Cairo, a metropolis forester, stated diversifying Portland’s cover is essential for slowing down the march of the beetle.

“For this reason we’re actively pushing for a variety in species once we plant and promote tree planting,” Cairo stated in a press release. “In order that when an invasive assaults one species it doesn’t trigger important hurt to the cover as an entire.”

The emerald ash borer is about 1/2-inch lengthy and smaller than the dimensions of a dime. It has killed greater than 100 million ash timber within the U.S. since its discovery in Michigan in 2002. It was found in Oregon in June.

Leah Bauer / U.S. Forest Service

Up to now, town has taken steps to map and stock all timber throughout town — dwelling to an city forest that consists of 220,000 avenue timber, 1.2 million park timber, and practically 3 million timber on non-public property.

Anticipating the borer’s arrival, town started proscribing new ash plantings in 2019. The state has created a repository of ash seeds at a facility in Cottage Grove that may assist with an eventual replanting.

“We all know that in Portland, a love of timber is a key a part of our shared id,” Commissioner Carmen Rubio, who leads Portland Parks & Recreation, stated in a press release. “PP&R’s City Forestry specialists have anticipated the arrival of the emerald ash beetle and have taken preliminary steps. As soon as we be taught extra from the Division of Forestry, we’ll be capable of decide further roles and actions for Portland.”

Emerald ash borers are solely ½-inch lengthy and smaller than a dime. They go away trademark D-shaped exit holes in tree bark.

Portland’s Parks & Recreation Division officers stated residents needs to be looking out for indicators of the emerald ash borer and will take the next steps to restrict the injury to Oregon’s tree cover:

  • Report sightings instantly.
  • Keep away from transferring firewood from one place to a different, since firewood can transport bugs.
  • Maintain ash timber wholesome, because the borer is drawn to confused timber. Which means watering timber through the summer time drought.
  • Keep away from planting any extra ash timber.
  • In case you are a neighborhood tree-care supplier, change into accustomed to indicators of emerald ash borer. Report sightings and eliminate wooden waste correctly.

For up-to-date info on Portland’s emerald ash borer response, go to


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