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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

How to get rid of tree-of-heaven: Solve Pest Problems

Tree-of-heaven is an invasive tree that spreads quickly and is difficult to control. It is a preferred food source for the invasive insect species spotted lanternfly. Learn how to identify and take action to control this aggressive weed.

Weston Miller, Jessica Green, J. Jeremiah Mann | May 2025 | Online resource

Spotted lanternfly resources

Spotted lanternfly (SLF) poses a threat to tree fruit and grape production. SLF has been reported as a serious pest in its invaded and home ranges.

May 2025 | Collection

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 Peer reviewed (Orange level)

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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

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

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

Oregon Master Beekeeper Program

Bronze Birch Borer

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

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 Peer reviewed (Gray level)

Latest News

OSU rangeland researchers help mitigate spread of invasive grasses

Communities in Eastern Oregon are better equipped to protect their rangelands from invasive grasses, reduce wildfire risk and restore the productivity and resilience of these vital ecosystems.

Vanessa Schroeder, Dustin Johnson | May 2025 | Impact story

Unconfirmed spotted lanternfly sighting prompts reminder for vigilance

Until a physical specimen is collected and confirmed, spotted lanternfly is not considered present in Oregon.

Kym Pokorny, Chris Branam | May 22, 2025 | News story

Oregon IPM Center leads the way to better pest management

The center’s strategies have been adopted by farmers and certification programs.

Silvia I. Rondon | May 2025 | Impact story

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Upcoming Events

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
Silvia I. Rondon
Director of Oregon IPM Center

Contact for Integrated Pest Management questions

Lorelle Sherman
Forestry and Natural Resources Extension Forester
Dan Stark selfie
Dan Stark
Forestry and Natural Resources, Assistant Professor of Practice
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Ask Extension

Have a question? Ask Extension!

Ask Extension is a way for you to get answers from the Oregon State University Extension Service. We have experts in family and health, community development, food and agriculture, coastal issues, forestry, programs for young people, and gardening.

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

Q: 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?

A: View answer | View all featured questions

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