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WI Natural Resources Board Status & Management of Eurasian Watermilfoil March 1, 2017 Webcast

Explore the challenges and strategies for managing Eurasian watermilfoil, a problematic aquatic plant found worldwide. Learn about prevention strategies, control measures, and the outcomes of large- and small-scale treatment programs. Discover the results of the Eagle River Chain project and the strategic analysis on aquatic plant management.

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WI Natural Resources Board Status & Management of Eurasian Watermilfoil March 1, 2017 Webcast

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  1. WI Natural Resources BoardStatus & Management of Eurasian WatermilfoilMarch 1, 2017 Webcast AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  2. Cisco Chain Moving Forward • Challenge of Aquatic Plant Management is finding the balance applying between: • Law • Science • Community expectations AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  3. Eurasian watermilfoil (EWM) A “successful” plant found worldwide Dense matting impedes lake use and displaces native plants Likes high nutrient, shallow lakes with lower water clarity Northern (sibiricum) our primary native Plants provide many benefits to fish, wildlife and water quality AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  4. Trends and Trajectory Found in southern counties in 1960s Currently in ~ 700 lakes statewide “Behaves” in most lakes – often less than 10% all plants in a lake AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  5. AIS Control Strategy Education, Planning and Prevention Early Detection & Response Control of Established Populations Containment and Maintenance Research and Demonstration AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  6. Prevention Strategies AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  7. 10 year EWM Study Established / Unmanaged Established / Managed New / Unmanaged New / Managed Unmanaged vs Managed Established vs New • Herbicide Effectiveness Concentration exposure time (CET) Large & Small Treatments AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  8. Large-scale Treatment Results • Can be very effective – outcomes highly variable – managing below 10% difficult • Better results for “newer” populations - less effective over time • Evidence of increased hybridity, herbicide resistance and shift to tolerant species • An integrated approach is best AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  9. Small-scale Treatments Half of treatments had no measurable effect due to rapid dissipation & low CET There seems to be a minimum threshold (> 5 acres?) but very site dependent Multiple spot treatments can have large-scale effects AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  10. Eagle River Chain – Project Results EWM Density 2017 Targeted spot treatment program Aggressive herbicide treatment program Paid hand-harvesting program

  11. Comparison to Michigan • Aquatic Plant Laws • Permits • State Review • Management Plans AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  12. Aquatic Plant Management (APM) Strategic Analysis • Process to address unresolved conflicts concerning alternative uses of available resources • Inform future discussion and decisions on APM and AIS control • Formation of APM Advisory Group AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

  13. WI Natural Resources Board AGENDA ITEM 4.A.1 Carroll Schaal, Lakes & Rivers Section Chief, Bureau of Water Quality

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