Summary of Algicides and Herbicides
Excessive algal and/or macrophyte biomass.
Toxic to plants.
Mode of action
Highly effective against susceptible species.
Algicides are effective for days.
Some herbicides provide at least seasonal control.
Decay of plants may produce a temporary dissolved
oxygen depletion, and release of nutrients may
stimulate an algal bloom.
Some chemicals are toxic to fish and fish food
Long-term effects on ecosystems remain unclear.
0 to 0
Costs range from
(5 to 0 acre
Their use may be the only feasible option; however, use
in potable waters is restricted, except for copper,
or restricted to use at some specified distance from
potable water intakes. For some herbicides,
a waiting period is designated following treatment.