Keep an eye out for Emerald Ash Borer

Watch these trees for Emerald Ash Borer

Photo: Washington Invasive Species Council
Oregon Ash

Emerald Ash Borer (EAB) is an invasive insect pest that has devastated populations of ash trees throughout the eastern US. Our local and endemic ash species, Oregon ash, is susceptible, but EAB has not been found on the West Coast yet. States need community scientists to keep an eye out and report concerns in order to respond quickly and reduce the impacts of the invasive EAB. 

There are more than 1500 recorded observations of Oregon ash on iNaturalist. Explore this distribution to find an tree near you. Then, keep an eye on it for symptoms of EAB.

More information is available at the links below:

WSU Seeks Volunteers for Stream Monitoring Project

WSU Seeks Volunteers for Stream Monitoring Project

Researchers from WSU seek citizen scientists to help monitor streams on the east side of the Cascades for tree harming microbes. They are particularly interested in the microbes that may be affecting western larch populations. Visit their webpage to get involved or find more information!

Sooty bark disease on maples in Seattle

Watch out for Sooty Bark Disease on Maples

Seattle urban forestry professionals are concerned with a disease on maple trees caused by Crpyostroma corticale. The fungus was identified as the cause of death for several sycamore maples (Acer pseudoplatanus) near Ravenna Boulevard in 2017 and has been recovered from many areas around Seattle since. The disease is referred to as ‘sooty bark disease’ because it is characterized by mats of black fungal spores after the bark is shed. Other symptoms of infection can include leaf wilting and branch dieback.

Of particular concern, the fungal spores of Cryptostroma corticale may cause respiratory hazards for those working with infected material.

Hosts confirmed by Seattle Parks and Recreation:
  • Sycamore maple (Acer pseudoplatanus )
  • Red maple (Acer rubrum)
  • Bigleaf Maple (Acer macrophyllum
  • Horse chestnut (Aesculus hippocastanum)
More information available at these sources:

Feel free to contact us should you have an observation to report or if you’re interested in having a sample tested.

Oregon Ash Conservation

Oregon Ash - Genetic Diversity Conservation

Oregon ash seedlings
Oregon ash (F. latifolia) seedlings growing at Dorena Genetic Resource Center - Photo Credit: R. Sniezko

The Emerald Ash Borer (EAB) threatens Oregon ash (Fraxinus latifolia) with local extinction. Western states such as Oregon are taking precautions and preparing for its arrival. Check out the Readiness and Response Plan for Oregon for more information about the threat.

Researchers from the Dorena Genetic Resource Center in Oregon are looking for additional seed collections from California and Washington. Collection time is expected from mid September through November. Collected seed will be used for gene conservation and possibly for EAB-resistance testing. Contact us to contribute!

Calls to Action

Watch this space!

This area of the website will feature important forest health issues that come up over time. For example, if an exotic insect pest is introduced and found in our region, we will use this space to highlight the issue and the ways that you can help.

Stay tuned!