August 27, 2014

Dear Mr. Morgan,

Thank you for the report of knotweed that you submitted. Japanese knotweed is a significant problem invader in 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. To address this shortfall, we are prioritizing our control of knotweed to targeted populations at several locations in Clackamas County. As such in situations such as those described, 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. It will help in our future planning efforts.

Sincerely,

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. 27, 2014, 1:58 a.m.