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Florida Lake Management Society Annual Conference, Naples, Florida, June 4 – 7, 2007

Naiad – Najas, Leafy pondweed - Potamogeton foliosus, Sago pondweed – Stuckenia, Waterweed – Elodea, Northern milfoil - Myriophyllum sibiricum, Aquatic mosses – Drepanocladus. Plants that show a wide response that suggests genotypic plasticity or perhaps adaptive capacity include Sago pondweed – Stuckenii, Coontail – Ceratophyllum, Water crowfoot – Ranunculus, Illinois pondweed - Potamogeton illinoensis, Curlyleaf pondweed - Potamogeton crispus.

Factors that govern the impact of fluridone on target and non-target plant species include dose, duration of exposure, reliance on carotene auxiliary pigments, method of propagation, depth of growth, and hydrologic features of the lake. Key features in plant recovery include:

  • Dose and exposure during treatment - survival

  • Immigration of plants

  • Seed base and proximity of vegetative populations

  • Weather

  • Alternative stable states hypothesis

Treatment considerations essential to planning will be discussed. Foremost is knowledge of the plant community that allows an assessment of the likely progression of assemblage composition and density after treatment based on the field data now available. Continued

collection Important

of such data will be essential to improved understanding and treatment designs. considerations for treatment designs include: Where a lakewide treatment is desired, choice of dose will depend mainly on desirability of preserving the existing non-target plant assemblage and the length of recovery period that can be tolerated. As the portion of the lake to be treated becomes smaller, the importance of maintaining non-target vegetation decreases. Each case calls for site-specific planning and flexible execution, applying any of a number of treatment options to achieve the planned dose. Consecutive year treatments may be needed for eradication or at least control, given plant ecology and treatment variability. Follow-up controls are almost essential.

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NOTES

Session 6A – Page 5

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