Good afternoon Mr. Carr,

Thank you for reporting this infestation of knotweed. Japanese knotweed is a significant problem invader in riparian communities within Clackamas County. The Clackamas Soil and Water Conservation District is working with regional partners to map and catalog known infestations of knotweed to help prioritize future control efforts.

Unfortunately, the resources required to control this invader are limited in relation to the overall need. As such we must rely upon landowners to initiate control on property they own or manage. We currently offer technical information and assistance to local landowners to help them develop a management strategy that is effective for their particular site conditions and needs.

Please feel free to contact me if you have any additional questions. You may also check these online resources for more information on knotweed.

http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/21809/em9031.pdf

http://your.kingcounty.gov/dnrp/library/water-and-land/weeds/BMPs/Knotweed-Control.pdf

http://www.imapinvasives.org/GIST/ESA/esapages/documnts/polycus.pdf

Again thank you for reporting this invader. All the best,

Sam
______________________________________

Samuel Leininger
WeedWise Program Manager
Clackamas Soil & Water Conservation District
221 Molalla Ave. Suite 102
Oregon City, OR 97045
503-210-6006
weeds@conservationdistrict.org
www.conservationdistrict.org
______________________________________

Samuel Leininger
Aug. 29, 2012, 9:11 a.m.