Washington State Knotweed Summit
February 18th, 2026 – Washington State Knotweed Summit
Join us online or in person at the D.F. Allmendinger Center, WSU Puyallup Research and Extension Center on February 18th, 2026.
Event Details
The event will occur in person and online via zoom on February 18, 2026 from 9:00am-3:30pm (with optional 1hr tour afterward).
In Person
Join us at the DF Allmendinger Center at the WSU Puyallup Research and Extension Center (2606 West Pioneer, Puyallup WA 98371).
Doors open at 8:30am. Meeting starts at 9:00am. Park anywhere on campus. The Allmendinger Center is on the South side of Kalkus Hall.
Online
Online participation is welcome! We will have a zoom meeting set up to share the presentations and answer questions.
WSDA Pesticide Recertification Credits Available
5 ‘Weed’ WSDA Pesticide Recertification Credits will be available for all participants. To receive credits, in-person attendees will need to fill out a paper form and online participants will need to complete a survey.
Please contact Joey Hulbert (hulbe@wsu.edu) with any questions.
Agenda
Please see below for a finalized agenda for the 2026 Washington State Knotweed Summit.
February 18, 2026. 9:00am-3:30pm PST.
| 9:00am | Welcome and Introductions | Jenn Andreas & Joey Hulbert (WSU) |
| 9:10am | An Overview of WSDA’s Knotweed Control Program | Jonathan Still (WSDA) |
| 9:40am | The 10,000 ft View: Using Drones for Weed Surveying and Control | Daniel Zimmerman (WDFW) |
| 10:10am | Knotweed… Now What? | Sayward Glise & Justin Brooks (King County) |
| 10:40am | Break | |
| 10:50am | Lessons Learned – 25 Years of Knotweed on the Hoh River – Still Learning! | Jill Silver (10,000 Years Institute) |
| 11:20am | Knotweed biocontrol efforts in Washington State | Jenn Andreas (WSU) |
| 11:40am | Morning Speaker Panel – Best practices, current needs, and future goals | Jonathan Still, Daniel Zimmerman, Sayward Glise, Justin Brooks, Jill Silver, Jenn Andreas |
| 12:10pm | Lunch | |
| 1:00pm | Knotweed Eradication Progress in the Sauk and Skagit Watersheds | Scott Morris (Sauk-Suiattle Indian Tribe) |
| 1:30pm | Snoqualmie Tribe Noxious Weed Treatment and Prevention | Michael Bailey (Snoqualmie Indian Tribe) |
| 2:00pm | Break | |
| 2:10pm | Invasive plant mapping and control in the Stillaguamish Basin | Jason Anderson (Stillaguamish Tribe of Indians) |
| 2:40pm | Afternoon Panel – Managing invasive plants on Tribal lands | Scott Morris, Michael Bailey, Jason Anderson |
| 3:15pm | Closing | |
| 3:30pm | Optional Tour Starts | Tour of relevant research trials in greenhouses, plant nursery, and labs. |
| 4:30pm | Optional Tour Ends |