Simply avoid having those weeds in the first place. Spartina and hydrilla are two aquatic plants currently not a problem in Oregon. But if they ever get a toehold like they have in Washington and California, look out. We would like to develop a program that would prevent them from becoming an established problem here.
Hydrilla poses a threat to Oregon's lakes, reservoirs and streams.
The fast-growing aquatic weed has been found in 17 California counties and in Washington. Once established, hydrilla destroys fish habitat, degrades water quality, clogs intake and fish screens, and fouls up recreation. Fishermen, water skiers, and boaters in general would find the green, leafy plant a big headache. Wildlife could find it even more undesirable since it takes over and displaces native vegetation. Spartina is a grassy weed that has invaded estuarine environments along the West Coast, with Oregon being a notable exception.