Laminated Root Rot Mitigation Field Tour – Fall 2023 in Woodinville

Learn how to manage laminated root rot

A common forest health problem

Laminated root rot is one of the most prolific forest health issues that forest landowners face. While this fungal disease is a natural part of our forest ecosystems, it can cause major conflicts with landowner objectives and create serious safety hazards. If left unchecked, the disease will steadily spread, killing susceptible tree species it infects. Douglas-fir, grand fir, western hemlock, and Sitka spruce are all susceptible. Fortunately, there is a management strategy to mitigate the problem and arrest the spread of the disease

On this field tour, you will explore a laminated root rot site that just had a sanitation harvest done to mitigate and stop the spread of the disease. This is the most common and reliable treatment for laminated root rot. This tour will show you a real example of how this treatment is done. You will learn how the disease was diagnosed, what the disease does, how the sanitation harvest was laid out, and the regeneration strategy to ensure a long-term healthy and resilient forest on this site. Experts will provide tips on how to manage laminated root rot on your own property and show you what to expect.

How to participate

Date and time

The tour will be held on Saturday, November 18, 2023 from 10:00 a.m. to 12:00 p.m.


This tour will be held at Crystal Lake Tree Farm in Woodinville, WA. Driving and parking details will be sent out via e-mail to registered attendees.

Cost and Registration

The cost to attend is $15 per household. Space is limited, and pre-registration is required. Register early to reserve your spot. Registration deadline is 5:00 p.m. November 15, 2023. Any cancellation requests must be received no later than November 10th to be eligible for a refund.

Register online

Register online via Eventbrite. Registrations via Eventbrite are subject to credit card processing fee. Online registration will be open until 5:00 p.m. November 15, 2023.

Register by mail

Mail-in registrations must be received by 5:00 p.m. November 15, 2023. Download the mail-in registration form (PDF). This fillable PDF form is an accessible document. Fill it out on your computer and then print it out and mail it in with a check made out to “Washington State University Extension” to:

WSU Extension Forestry
Attn: Root Rot Tour Registration
6705 Puget Park Dr
Snohomish, WA 98296

Note: to fill out the mail-in registration form, we recommend that you right-click the download button and select “Save link as” to save the PDF file, and then open it in Adobe Acrobat or the free Adobe Reader rather than viewing it within your web browser. The form functions do not work when viewed in a browser window.

Acknowledgements and Accommodations

This program is made possible in part by funding from Snohomish County Surface Water Management. In-kind support is provided by Crystal Lake Tree Farm and the Washington Department of Natural Resources.

Extension programs and employment are available to all without discrimination. Evidence of noncompliance may be reported through your local Extension office. Reasonable accommodations will be made for persons with disabilities and special needs who contact Sarah Stewart at least three weeks prior to the event.