Scientific Evaluation of Efficacy and Selectivity of Herbicide Treatments in Wisconsin Lakes

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Aquatic Invasive Species (AIS): Curly-leaf pondweed (Potamogeton crispus)
Eurasian Watermilfoil (Myriophyllum spicatum)
Project Location: Wisconsin
Project Start Date: 06/2007
Expected Timeframe/Duration: ongoing
Sponsoring Organization: WI DNR Science Services
Web Links:
Primary Contact: Michelle Nault
WI DNR Science Services

Secondary Contact:
Project Summary:

For the past several years, the WI DNR has worked in collaboration with various stakeholders (lake groups and lake management professionals), as well as academic and agency scientists and resource managers to develop and implement plans for strategic and efficient control of Eurasian watermilfoil (Myriophyllum spicatum, EWM) and curly leaf pondweed (Potamogeton crispus, CLP).  In order to evaluated the efficacy, selectivity, and potential non-target effects associated with chemical herbicde treatments, we conducted intensive water sample collection and aquatic plant community monitoring following herbicde applications on a diverse subset of lakes and flowages.  

We have results from multiple case studies evaluating the effectiveness of both large-scale and small-scale chemical herbided treatments to control EWM and CLP.  By systematically measuring actual in-lake herbicide concentration and exposure times, as well as subsequent aquatic plant community responses under varying operational conditions, we hope to develop future management recommendations and continure to imporve our ability to control invasive aqatic plants while minimizing advers effects to native species and water quality.