Japanese Knotweed (Fallopia japonica) on May 1, 2010
Submitter does not have a specimen
EDRR Status: Local expert notified
Description of specimen
Lots of Japanese Knotweed, Clematis, Ivy and Scotch Broom.
Last year, I cut some of the ivy off trees at the north end of the area and cut (dug a few) some clematis off the trees. The Japanese Knotweed is probably the greatest threat.
Letting seeds go into Clackamas River will spread these weeds on down the Willamette River.
Probably combintation of ODOT and railroad property.
Commentary
Expert Reviewer
Samuel Leininger
Clackamas Soil and Water Conservation District
4-County Cooperative Weed Management Area
Columbia Gorge Cooperative Weed Management Area
Thanks for reporting this infestation of knotweed. 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 needed to control this invader are limited in relation to the overall need. As such we currently offer technical information to local landowners to help them develop a management strategy that is effective to their particular site conditions and needs. I try to work with the appropriate landowner to develop an effective response.
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
503-655-3144 x118
samuel.leininger@or.nacdnet.net
www.conservationdistrict.org
______________________________________
Samuel Leininger
May 11, 2010, 10:16 a.m.