Chemical control is accomplished using toxic chemicals such as pesticides, herbicides, and algaecides. Ideally, the chemical is harmful only to the target species, but this is not always the case.
By: Eric R. Norland, Assistant Professor, Natural Resources
Extension Specialist, Natural ResourcesAquatic plants are an important element of any aquatic ecosystem, whether it is a stream, pond, lake, or reservoir. Most naturally occurring aquatic ecosystems have been impacted by human activity, resulting in increased nutrients or sediments from various land uses. Many more aquatic ecosystems have been created by human efforts through the construction of ponds, lakes, and reservoirs. One result of these artificially created bodies of water is the development of aquatic plant communities.
A Louisiana Department of Wildlife and Fisheries spray crew applies herbicide for aquatic weed control.Excessive plant growth often interferes with the uses for which these water bodies were created. Recreation, (swimming, boating, fishing), aesthetic values, and domestic uses often necessitate the active management of aquatic vegetation. This management is accomplished with either preventative measures or control measures. Vegetation control may be accomplished with biological, mechanical, or chemical methods. The focus of this fact sheet is chemical control of aquatic plants with approved herbicides and algaecides. Pond owners will be most successful in managing aquatic vegetation by using a variety of methods, however. No single control strategy is likely to provide long-term satisfactory results.
Source: Ohio State University Extension Service
Link to Word Document: Aquatic herbicides labeled for control of common aquatic plants.