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Invasive species

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Announcements

Emerald ash borer permanent quarantine for Washington, Yamhill, Marion and Clackamas counties

The invasive pest emerald ash borer has been found in Oregon and a permanent quarantine prohibiting the movement of tree materials was issued for four counties. Read more...
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Latest Resources

Monitoring Oregon ash forests in the face of the emerald ash borer: A guide for small woodland owners and managers

The emerald ash borer threatens Oregon ash forests. This guide offers methods for long-term monitoring, helping landowners track changes and assess impacts on their trees and landscape over time.

David C. Shaw, Katie Hill, Karen Ripley, Dan Stark, Wyatt Williams | Feb 2025 | OSU Extension Catalog

Should I prune my ash trees now to help prevent an emerald ash borer infestation?

P: I live in Beaverton and I want to prune my two large ash trees before the fall winds come. I think emerald ash borers would find the sap from my pruned trees attractive. When is it safe to prune my ash trees?

R: View answer | View all featured questions

Solve Pest Problems: Invasive Insects and Plants (in English)

A collection of resources for identifying and understanding invasives. Invasives are non-native species that spread aggressively and alter the environment. Non-native species that harm Pacific Northwest habitats include invasive insect, worm, and plant species.

LeAnn Locher | Sep 2024 | Online resource

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Controlling Invasive Plants

Some common garden plants have become invasive pests in wild habitats. In Oregon, these invasives include some favorites such as English ivy and butterfly bush.

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Invasive Insects

Spotted lanternfly resources (in English)

The spotted lanternfly is an invasive pest in the United States that was first detected in 2014 in Pennsylvania. It is a pest of numerous cultivated and wild hosts. It can cause serious damage to apples, grapes, stone fruit, landscape trees, and others and can be a nuisance pest in urban areas.This page offers an introduction to the pest, photos of each part of the insect's life cycle, and detailed videos for more information.

Dr. Surendra Dara | Apr 2021 | Online resource

Emerald ash borer resources

Learn how to identify ash trees and the emerald ash borer beetle. Find out how Oregonians are working to prevent the spread of this destructive insect.

Aug 2022 | Collection

Brown Marmorated Stink Bug (BMSB)

Information and resources about the brown marmorated stink bug (BMSB), an invasive

Nik Wiman, Rick Hilton, Clive Kaiser, Vaughn Walton, Rachel Suits, David Lowenstein, Victoria Skillman, Heather Andrews | Dec 2018 | Collection

Spotted Wing Drosophila (SWD)

Information and resources about monitoring, identification, and management of spotted wing drosophila (SWD), an invasive fruit fly.

Vaughn Walton, Linda Brewer, Bernadine Strik, Patricia A. Skinkis, Peter Shearer, Jana Lee, Man-Yeon Choi | Apr 2024 | Collection

Northern giant hornet resources (in English)

Information from the Washington State Department of Agriculture about the Northern giant hornet (formerly Asian giant hornet).

Oregon Master Beekeeper Program

Bronze Birch Borer (in English)

Information on the bronze birch borer from the Pacific Northwest Pest Management Handbook.

Jul 2018 | Online resource

Become an Oregon Forest Pest Detector!

Oregon Forest Pest Detectors (OFPDs) are trained to recognize the signs and symptoms of invasive forest insects. They apply these skills in their day-to-day activities as arborists, parks managers, foresters, community tree stewards, Master Gardeners and other roles.

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Aquatic Invasive Species

Zebra & Quagga Mussels Species Guide (in English)

This guide provides in depth information on invasive zebra and quagga muscles. It is a companion resource to the Menace to the West an invasive species curriculum. Appropriate for grades 8-12.

Samuel Chan, Tania Siemens, Rick Cooper | Mar 2021 | Online resource

Pest alert: Invasive zebra mussels arrive in Oregon in "moss" balls sold for aquariums

Pest alert! The highly invasive Zebra mussel has made it into Oregon through moss balls, popular among aquarium hobbyists and commonly sold in pet stores. Invasive species experts say potentially contaminated moss balls should be destroyed.

Adriene Koett-Cronn, Samuel Chan | Mar 2025 | OSU Extension Catalog

Latest News

OSU Extension works with partners to fight emerald ash borer

Efforts to manage the emerald ash borer in Oregon help protect the state's ash trees and maintain the health of its forests and urban landscapes.

Dan Stark, Lorelle Sherman, Lauren Grand | Feb 2025 | Impact story

Solve Pest Problems website gives gardeners solutions

Solve Pest Problems provides Oregon gardeners with easy access to research-based solutions for common pest and disease issues, helping them manage their gardens more effectively and safely.

Signe Danler | Feb 2025 | Impact story

Dormant-season grazing research project reduces fine fuels in Malheur County

Over the past eight years, this research has removed over 6,500 tons of fine fuels, preventing potential wildfire fuel in Malheur County’s rangelands. This approach has saved ranchers approximately $313,000 in winter feed costs, benefiting both the agricultural economy and public land management.

Sergio Arispe | Jan 2025 | Impact story

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Upcoming Events

Jun 6

Emerald Ash Borer: Identification, Reporting, and Weighing Management Options

8:30 am - 12:30 pm Beavercreek, OR
Jun 27

Tree School East 2025

8:00 am - 5:00 pm Baker City, OR
Jul 8

Intruder Alert: Early Detection of Invasive Species

12:00 pm - 1:00 pm PDT Online
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Meet Our Experts

Samuel Chan
Watersheds & Aquatic Invasive Species
Lorelle Sherman
Forestry and Natural Resources Extension Forester
Dan Stark selfie
Dan Stark
Forestry and Natural Resources, Assistant Professor of Practice
Karen Wagner
Education Program Assistant 2, SNAP-Ed

Ask me about healthy food and lifestyles, school gardens, climate education, or healthy communities

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Should I prune my ash trees now to help prevent an emerald ash borer infestation?

P: I live in Beaverton and I want to prune my two large ash trees before the fall winds come. I think emerald ash borers would find the sap from my pruned trees attractive. When is it safe to prune my ash trees?

R: View answer | View all featured questions

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