Pondweed

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Chemical Treatments

Read and follow label instructions before using any chemical in water. Refer to the publication 2010 Weed Control Guidelines for Mississippi for specific recommendations, application rates, and water use restrictions.

• Diquat
  Harvester, Redwing, Reward, Weedtrine
  Water use restrictions for drinking and animal consumption with this herbicide. Irrigation restriction.
• Fluridone
  Avast, Sonar A.S., Sonar One, Sonar PR, Sonar Q, Sonar SRP, Whitecap
  Water use restrictions for irrigation of turf, forage, and food crops.
• Triclopyr
  Renovate 3, Renovate OTF
  Water use restriction for irrigation of forage and food crops.

The information given here is for educational purposes only. Reference to commercial products or trade names is made with the understanding that no discrimination is intended toward other products that may also be suitable.

Special care was taken to make certain that all herbicide treatments are registered with the Environmental Protection Agency for use in the manner described. Registrations of specific practices are often changed or deleted; therefore, treatments suggested in this information sheet may not remain current indefinitely. Read and observe the manufacturer's label to prevent misuse of a herbicide. It is not intended or proposed that usage of any given practice suggested be in violation with existing registration or manufacturer's label.

If you fail to carefully read and follow suggested treatments, you could cause extensive damage to the environment, crops, livestock or humans.

Biological Treatments

Grass carp can be stocked in ponds and lakes to suppress submersed aquatic plants. Grass carp are typically stocked at rates of 5–30 fish per acre, depending on the size and extent of plant infestation. In new ponds, 2- to 6-inch fish can be stocked. However, in ponds with established bass populations, 8- to 10-inch carp should be stocked to prevent bass from eating them. Grass carp are somewhat specific about which plants they will eat. They prefer tender, nonwoody vegetation and are best suited for control of submersed plants such as some pond-weeds, bushy pondweeds, hydrilla, egeria, and some macro-algae. As grass carp grow, consumption of plant material will decrease. Additional fish should be stocked about every 5 years to maintain plant suppression. See publication 1894 - Grass Carp in Mississippi Farm Ponds for more information.