Soll J, 2004. Controlling knotweed (Polygonum cuspidatum, P. sachalinense, P. polystachyum and hybrids) in the Pacific Northwest. Portland, Oregon, USA: Nature Conservancy, Oregon Field Office. 15 pp.

Soll J, 2004. Controlling knotweed (Polygonum cuspidatum, P. sachalinense, P. polystachyum and hybrids) in the Pacific Northwest. Portland, Oregon, USA: Nature Conservancy, Oregon Field Office. 15 pp.