How do I eradicate knot weed on my creek bank?
Tillamook County Oregon
Thank you for your question about Japanese knotweed. Here is a link to an OSU Extension article on that topic. You will see that there are various management strategies short of chemical application, but, if you get to that point, the herbicides that proven at least somewhat effective are found on page 4, with notations about which are safe for use near water (Rodeo and Habitat.)
I hope this is helpful. Good luck!