Aquatic Plant Management Options for Caddo Lake by c17gf7Uo


									Aquatic Plant Management
 Options for Caddo Lake

              Timothy J. Bister
     Texas Parks and Wildlife Department
         Inland Fisheries District 3A
               Marshall, Texas
         Plan Objectives
• Establish long-term management of
  nuisance aquatic plants in Caddo Lake

• Maintain a healthy lake ecosystem

• Protect native aquatic habitat

• Maintain access for users
      Problematic Species
• Waterhyacinth

              • Hydrilla

                           • Giant salvinia
   Mechanical Harvesters
• Limited to water >2 feet deep with few

• Past experience has proven ineffective
  and cost prohibitive
          Triploid Grass Carp

•   Effective for control of hydrilla
•   Not effective for waterhyacinth
•   Not considered a viable control for giant salvinia
•   Will eat native species
•   Would require emigration barrier
•   Would require agreement between TX & LA
• Giant salvinia
  – Conduct herbicide treatments
    • Glyphosate/Diquat mixture
  – Physical removal/disposal by
    trained/permitted volunteers
  – Increase public awareness through signs,
    flyers, and news releases
  – Release giant salvinia weevils in areas that
    become uncontrollable with herbicide
  – Conduct annual aquatic vegetation surveys
    to monitor giant salvinia coverage
• Waterhyacinth
  – Continue herbicide treatments
    • 2,4-D
    • WMA, boat ramps, other access
    • Supplemental efforts from other entities fully

  – Conduct annual surveys (Aug/Sep) to
    monitor coverage of waterhyacinth
• Hydrilla
  – Maintain critical boat lanes restricted by
    hydrilla with herbicide

  – Not most critical problem at this time

  – Assess hydrilla coverage during annual
    aquatic vegetation surveys
• Create on-site vegetation control crew
  – May to October
  – Hire private herbicide applicator

• Pursue additional funding
  – Support spray crew
  – Purchase herbicide

• Develop long-term plan

To top