FORKS (August 22, 2003) — Danielle Black swats at vicious green flies in the still, humid air as she kneels along the banks of the trickling Dickey River. In a thicket of five-foot green stalks, Black, a Quileute tribal member and fisheries technician, is working to kill the invasive Japanese knotweed plant by injecting weed killer into each stalk with a syringe.

Japanese knotweed and giant knotweed – often found as ornamental bushes in gardens – spread quickly, and can overrun all other plants around them. The knotweeds even out-compete other notorious invasive plants such as Scot