Land Plants - invasive

Knotweed (unknown species) (Fallopia sp.) on Aug 20, 2011

Originally reported as Japanese Knotweed (Fallopia japonica)

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

Description of specimen

a larch clump covering 15-20 square feet of mature knotweed (in bloom).

Commentary

Thanks Doug for your knotweed report. I have also seen knotweed patches expanding along the main stem of the Willamette River. I am not sure who has capacity to respond but I do believe it is important to do so, especially considering all the vulnerable downstream habitat. I'll look into whether or not any response will be possible and let you know.

Thanks,
Tania
Tania Siemens
WISE Program Coordinator (Watershed and Invasive Species Education)
Oregon Sea Grant Extension
Oregon State University
tania.siemens@oregonstate.edu
541-914-0701

Tania Siemens
Aug. 24, 2011, 12:44 a.m.

Remedy

Knotweed Shrub Complex: Identification, Biology, and Management, Oregon Extension Service

Location

a gravel bar on the west bank of the Willamette River about 1/4 mile downstream from the Marshall Island boat ramp.

Expert Reviewer

Tania Siemens
WISE Program Coordinator (Watershed and Invasive Species Education)
Oregon Sea Grant Extension
Oregon State University
tania.siemens@oregonstate.edu
541-914-0701

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