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Oregon State University's Solve Pest Problems page has some great information about how to get rid of knotweeds Solve Pest Problems
This is a tricky weed to manage. Consider reaching out to your local Soil & Water Conservation District for technical advice.
japanese knotweed along the bank of Willamette river at concrete business. visible from main street, independence.
Mr. Vern Holm Director, Oregon Vegetation Management Association
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