Report #5990 - Report: Knotweed (unknown species) (Fallopia sp.)

Knotweed (unknown species) (Fallopia sp.) on May 13, 2024

Submitter does not have a specimen
EDRR Status: Local expert notified

Description of specimen

The plants were about 4' high, slightly wilted, not yet flowering. The stand along the rock crevice was about 6-7' in length. I could not determine if it was a single root system or many individual plants. The roots were difficult to access, but felt dense, woody, and very securely rooted.

Commentary

Thank you Erin for this report, the photo's indicate that this is indeed Japanese Knotweed. The Wilson River has acres of Knotweed starting above Lee's Camp, continuing up the North Fork Wilson, reaching all the way down to the confluence.
ODA began a treatment site last year, 3 mile stretch on the North Fork. I have treated some sites on the lower part of the Wilson. It is a ongoing process to address the entire river within Tillamook County.

Thank you very much for looking & the photos.
Check out our website: https://tillamookcountyswcd.org/
You can find ways to control Knotweed.
Michael Blankenship, TCSWCD

Michael Blankenship
May 15, 2024, 1:48 a.m.

Location

I accessed this site by parking at the gravel pullout directly northeast of the dropped pin. After following the BPA powerline trail down to the river's edge, there is a sandy beach. I walked upriver to the approximate pin location and saw this stand of knotweed densely and deeply rooted in a single rock crevice. about 5 ft. from the river's edge. Be advised that to access the site, it was necessary to wade through sections of the river and navigate steep, slippery surfaces.

Knotweed (unknown species) (Fallopia sp.) on May 13, 2024

Description of specimen

Commentary

Remedy

Location

Expert Reviewer