Japanese Knotweed (Fallopia japonica) on May 4, 2013
Submitter does not have a specimen
EDRR Status: Population assessed
Description of specimen
There are several thick patches of knotweed. The attached photo was taken on April 20, 2013.
Commentary
Expert Reviewer
Samuel Leininger
Clackamas Soil and Water Conservation District
4-County Cooperative Weed Management Area
Columbia Gorge Cooperative Weed Management Area
Thank you for reporting this infestation of knotweed. Knotweed is a significant invader in riparian communities within Clackamas County. The Clackamas Soil and Water Conservation District is working with county and regional partners to map and catalog known infestations of knotweed to help prioritize future control efforts. We have surveyed the site and contacted Clackamas County land managers working at Wagon Wheel.
The knotweed infestation along that stretch of the Molalla is extensive and we are currently working to develop a long term strategy for dealing with this weed. Unfortunately, the resources available to control this invader are limited in relation to the overall need. As such resources may not be immediately available for control, but we are aware of the problem and working to find a solution.
Please feel free to contact me if you have any additional questions. Check these online resources for more information on knotweed.
http://www.skamaniacounty.org/Noxious_Weeds/TNCreport.htm
http://www.imapinvasives.org/GIST/ESA/esapages/documnts/polycus.pdf
Again thank you for reporting this invader.
Sincerely,
______________________________________
Samuel Leininger
WeedWise Program Manager
Clackamas Soil & Water Conservation District
221 Molalla Ave. Suite 102
Oregon City, OR 97045
503-210-6006
sleininger@conservationdistrict.org
www.conservationdistrict.org
______________________________________
Samuel Leininger
May 8, 2013, 10:08 a.m.