- Japanese Knotweed Alliance - Information on the problem of Japanese knotweed and the concept of natural (biological) control using FAQs, links and updates.
www.cabi-bioscience.org/html/japanese_knotweed_alliance.htm
- Polygonum cuspidatum - Japanese Knotweed - Image, description, and invasiveness.
www.ecy.wa.gov/programs/wq/plants/weeds/aqua015.html
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