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Aquatic Plant Research > Invasives > Management and Control > Eurasian Watermilfoil (EWM) Control > Large Scale Management > EWM 2,4-D

Aquatic Plant Research EWM 2,4-D

DNR Science Services researchers are studying the effects of the herbicide 2,4-D on Eurasian watermilfoil and impacts to the native plant community.

Continued Research on Large Scale 2,4-D Treatments

DNR Science Services have conducted multiple case studies examining the efficacy, selectivity, and longevity of utilizing early-season low-dose 2,4-D treatments on a lake-wide scale across multiple lakes in Wisconsin. Although target species control has been achieved with some of these low-dose applications, additional monitoring and field studies are needed due to variation in herbicide persistence, observations of reduced control in some hybrid genotypes, and negative impacts to certain native plants.



    Efficacy, Selectivity, and Herbicide Concentrations after a 2,4-D Whole-lake Application

    Recognizing a need to better understand large-scale herbicide treatments, DNR Science Services conducted a controlled study examining the efficacy, selectivity, and longevity of utilizing early-season low-dose 2,4-D treatments on a lake-wide scale. While multi-year Eurasian watermilfoil control was achieved with these single low-dose applications, persistence of the herbicide was longer than expected and impacts to certain native plants were also observed. This study provides regional management and statewide policy makers with science-based information regarding large-scale 2,4-D treatments for control of Eurasian watermilfoil, and is the first of its kind to link field-collected 2,4-D concentration measurements to selectivity and long-term efficacy in Eurasian watermilfoil control following whole-lake management efforts. The resulting paper was nominated for the James LaBounty 'Best Paper' award in 2014 by the North American Lake Management Society's journal 'Lake and Reservoir Management.'



      Large Scale Chemical Management Fact Sheet

      DNR Science Services created a factsheet to summarize current scientific data and understanding of large-scale chemical management of Eurasian watermilfoil and curly-leaf pondweed. This factsheet provides regional managers, statewide policy makers, and concerned citizens with science-based information regarding large-scale 2,4-D and endothall treatments for control of non-native aquatic plants. Factsheets are utilized internally, by citizens and multiple statewide and national organizations.



        Large-scale Herbicide Treatments in Wisconsin Lakes

        DNR Science Services contributed an article in LakeLine that summarized the current scientific understanding of chemical management of Eurasian watermilfoil and provided a framework for evaluation of herbicide treatments for regional managers, statewide policy makers, and concerned citizens. This article has been utilized and cited internally and by multiple statewide and national organizations.