Aquatic Plant Management Options for Caddo Lake by c17gf7Uo

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									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
  stumps

• 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
        Recommendations
• 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
        Recommendations
• Waterhyacinth
  – Continue herbicide treatments
    • 2,4-D
    • WMA, boat ramps, other access
    • Supplemental efforts from other entities fully
      supported


  – Conduct annual surveys (Aug/Sep) to
    monitor coverage of waterhyacinth
        Recommendations
• 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
        Recommendations
• 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

								
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