Good Morning Alexis,

I want to thank you for reporting this infestation of knotweed. Japanese knotweed is a significant problem invader 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. We are currently treating a number of knotweed patches at priority sites across Clackamas County. Unfortunately, the patch location you submitted is outside of our current priority areas. As such we must rely upon landowners to initiate control on the 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.

Your report will help us to prioritize future knotweed treatments. So thank you for taking the time to report this invasive species. Please feel free to contact me if you have any additional questions.

For more information please check out the resources provided below.

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

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

Sam

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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
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Samuel Leininger
July 25, 2019, 3:35 a.m.