Dr. Wersal's Selected Publications

PEER REVIEWED PUBLICATIONS

Moses, N.M., R.M. Wersal, and C.T. Ruhland. 2024. Differential photosynthetic yield across a wide range of temperatures for northern and invasive watermilfoils. Journal of Freshwater Ecology 39:1, 2412157, DOI: 10.1080/02705060.2024.2412157

Squires, A.C., R.M. Wersal, G. Turnage, C.R. Mudge, and B.P. Sperry. 2024. Seasonal phenology and starch allocation patterns of Oxycaryum cubense in the southeastern United States. Invasive Plant Science and Management. https://doi.org/10.1017/inp.2024.15

Squires, A.C., G. Turnage, R.M. Wersal, C.R. Mudge, and B.P. Sperry. 2024. Modeling accumulated degree-days for the invasive aquatic plant Oxycaryum cubense in the southeastern United States. Journal of Freshwater Ecology. 39:1, 2346646, DOI: 10.1080/02705060.2024.2346646

Squires, A.C., G. Turnage, and R.M. Wersal. 2024. Modeling accumulated degree-days for the invasive aquatic plants Oxycaryum cubense and Eichhornia crassipes in Mississippi. Journal of Aquatic Plant Management. 62:23-29.

Carver, P., R.M. Wersal, and M.G. Gebhart. 2024. Environmental factors influencing biomass and bulbil production of  Nitellopsis obtusa in Lake Koronis, Stearns County, Minnesota. Journal of Aquatic Plant Management. 62:1-6. 

Gebhart, M.G. and R.M. Wersal. 2023. Ecological Niche Modeling of Diploid Flowering Rush (Butomus umbellatus L.) in the United States. Journal of Freshwater Ecology. 39:1, 2292232, DOI: 10.1080/02705060.2023.2292232

Haram, A.M. and R.M. Wersal. 2023. Simulated mechanical control of Nitellopsis obtusa under mesocosm conditions. Invasive Plant Science and Management 16:191-195. doi: 10.1017/inp.2023.18

Haram, A.M. and R.M. Wersal. 2023. Seasonal starch allocation of starry stonewort (Nitellopsis obtusa) growing in Lake Koronis, MN. Journal of Freshwater Ecology 38: 2211086 http://dx.doi.org/10.1080/02705060.2023.2211086

Clarke, M., R.M. Wersal, and G. Turnage. 2023. Seasonal phenology and starch allocation patterns of Cuban bulrush (Oxycaryum cubense) growing in Mississippi, USA. Aquatic Botany 186: 103627. https://doi.org/10.1016/j.aquabot.2023.103627.

Carver, P., R.M. Wersal, and B.T. Sartain. 2022. Small plot field evaluations of aquatic pesticides for control of starry stonewort (Nitellopsis obtusa) in Lake Koronis, MN. Journal of Aquatic Plant Management. 60:79-84.

Wersal, R.M., B.T. Sartain, K.D. Getsinger, J.D. Madsen, J.G. Skogerboe, J.J. Nawrocki, R.J. Richardson, and M.R. Sternberg. 2022. Improving chemical control of nuisance aquatic plants in run-of-the-river reservoirs. Invasive Plant Science and Management 15:141–151. https://doi: 10.1017/inp.2022.18.

Wersal, R.M. 2022. Small-scale evaluations of select pesticides for development of management recommendations for starry stonewort (Nitellopis obtusa). Journal of Aquatic Plant Management 60:10-15.

Schmid, S.A., R.M. Wersal, and J.P. Fleming. 2022. Abiotic Factors that Affect the Distribution of Aquatic Macrophytes in Shallow North Temperate Minnesota Lakes: A Spatial Modeling Approach. Aquatic Ecology 56:917–935. https://doi.org/10.1007/s10452-022-09969-3.

Schmid, S.A. and R.M. Wersal. 2021. Aquatic Macrophyte Community Shifts in Five Shallow Lakes in Sibley County, MN. Journal of Aquatic Plant Management 59:72-78.

Ortiz, M.F, M.R.A. Figueiredo, S.J. Nissen, R.M. Wersal, W.A. Ratajczyk, and F.E. Dayan. 2021. 2,4-D and 2,4-D Butoxyethyl ester behavior in Eurasian and Hybrid Watermilfoil Myriophyllum spp. Pest Management Science 78:626-632.

Madsen, J.D., R.M. Wersal, S.A. Schmid, R.A. Thum, M.E. Welch, and V. Phuntumart. 2021. The Identification of Watermilfoil, Discovery of Hybrid Watermilfoil, and Their Implications for Aquatic Plant Management in the Clark Fork River, Western MT, USA. Journal of Freshwater Ecology 36:111-124.

Fleming, J.P., R.M. Wersal, J.D. Madsen, and E.D. Dibble. 2021. Weak non-linear influences of biotic and abiotic factors on invasive macrophyte occurrence. Aquatic Invasions 16:349-364.

Wersal, R.M. and G. Turnage. 2021. Using contact herbicides for control of duckweed and watermeal with implications for management. Journal of Aquatic Plant Management 59:40-45.

Turnage, G., J.D. Madsen, R.M. Wersal, J.D. Byrd, B. Alcott, and T. Guetter. 2020. Selective control of flowering rush in mesocosms and field sites. Journal of Aquatic Plant Management 58:92-97.                                                     

Turnage, G., R.M. Wersal, and J.D. Madsen. 2020. Torpedograss control via submersed applications of systemic and contact herbicides in mesocosms. Journal of Aquatic Plant Management 58: 67-71. 

Turnage, G., J.D. Byrd, R.M. Wersal, and J.D. Madsen. 2019. Sequential applications of diquat to control flowering rush (Butomus umbellatus L.) in mesocosms. Journal of Aquatic Plant Management 57:56-61.

Turnage, G., J.D. Madsen, R.M. Wersal, and J.D. Byrd. 2019. Simulated mechanical control of flowering rush (Butomus umbellatus) under mesocosm conditions. Invasive Plant Science and Management 12:120-123.

Wersal, R.M. and J.D. Madsen. 2018. Designing and using phenological studies to define management strategies for aquatic plants. In Compendium: Journal of Aquatic Plant Management Research Methods. Journal of Aquatic Plant Management 56s:83-89. Invited Paper.

Madsen, J.D. and R.M. Madsen. 2018. Proper survey methods for research of aquatic plant ecology and management. In Compendium: Journal of Aquatic Plant Management Research Methods. Journal of Aquatic Plant Management 56s:90-96. Invited Paper.

Turnage, G., J.D. Madsen, and R.M. Wersal. 2018. Phenology of curlyleaf pondweed (Potamogeton crispus L.) in the southeastern US: a two-year mesocosm study. Journal of Aquatic Plant Management 56:35-38.

Calomeni, A.J., T.D. Geer, K.J. Iwinski, J.H. Rodgers, J.D. Madsen, and R.M. Wersal. 2017. Monitoring for national pollutant discharge elimination system permit requirements: algaecides. Journal of Integrated Pest Management 27:1-9.

Turnage, G., R.M. Wersal, and J.D. Madsen. 2017. Evaluating the efficacy of granular copper and triclopyr alone and in combination for control of flowering rush. Journal of Aquatic Plant Management 55:120-122.

Madsen, J.D., T.E. Woolf, and R.M. Wersal. 2017. Flowering rush control on drawn-down sediment: Mesocosm and field evaluations. Journal of Aquatic Plant Management 55:42-45.

Madsen, J.D. and R.M. Wersal. 2017. A review of aquatic plant monitoring and assessment methods. Journal of Aquatic Plant Management 55:1-12. 

Madsen, J.D., R.M. Wersal, and M.D. Marko. 2016. Distribution and biomass allocation in relation to depth of flowering rush (Butomus umbellatus) in the Detroit Lakes, Minnesota. Invasive Plant Science and Management 9:161-170.

Robles, W., J.D. Madsen, and R.M. Wersal. 2015. Estimating the biomass of waterhyacinth [Eichhornia crassipes (Mart.) Solms] using the normalized difference vegetation index. Invasive Plant Science and Management 8:203-211.

Madsen, J.D., R.M. Wersal, and T.E. Woolf. 2015. Operational control of Eurasian watermilfoil and impacts to the native submersed aquatic macrophyte community in Lake Pend Oreille, Idaho. Invasive Plant Science and Management 8:219-232.

Madsen, J.D., R.M. Wersal, and W. Robles. 2015. Evaluation of six herbicides for control of swamp smartweed (Periscaria hydropiperoides (Michx.) Small. Journal of Aquatic Plant Management 53:224-227.

Turnage, G., J.D. Madsen, and R.M. Wersal. 2015. Comparative efficacy of chelated copper formulations alone and in combination with diquat against hydrilla and subsequent sensitivity of American lotus. Journal of Aquatic Plant Management 53:138-140.

Sartain, B.T., R.M. Wersal, and J.D. Madsen. 2015. Evaluation of six herbicides for the control of water primrose (Ludwigia peploides (Kunth) P.H. Raven spp. glabrescens). Journal of Aquatic Plant Management. Journal of Aquatic Plant Management 53:134-137.

Fleming, J.P., E.D. Dibble, J.D. Madsen, and R.M. Wersal. 2015. Investigation of Darwin’s naturalization hypothesis in invaded macrophyte communities. Biological Invasions 17:1519-1531.

Wersal, R.M., A.G. Poovey, J.D. Madsen, K.D. Getsinger, and C.R. Mudge. 2014. Comparison of late-season herbicide treatments for control of flowering rush in mesocosms. Journal of Aquatic Plant Management 52:85-89.

Cox, M.C., R.M. Wersal, and J.D. Madsen. 2014. Assessing the aquatic plant community composition within the littoral zone of the Ross Barnett Reservoir, MS, USA: A six-year evaluation. Invasive Plant Science and Management 7:375-383.

Cox, M.C., R.M. Wersal, and J.D. Madsen. 2014. Evaluations of foliar applied herbicides for alligatorweed (Alternanthera philoxeroides) control. Journal of Aquatic Plant Management 52:27-30. 

Wersal, R.M., J.D. Madsen, and J.C. Cheshier. 2013. Seasonal biomass and starch allocation of Phragmites australis (Haplotype I) in Southern Alabama, USA. Invasive Plant Science and Management 6:140-146. 

Wersal, R.M. and J.D. Madsen. 2013. Survival of the invasive aquatic plant Myriophyllum aquaticum to seasonal drawdown events. Journal of Aquatic Plant Management. 51:22-26. 

Wersal, R.M. and J.D. Madsen. 2013. Influences of light intensity variations on growth characteristics of Myriophyllum aquaticum. Journal of Freshwater Ecology 28:147-164. Editor’s Choice Article.

Wersal, R.M. and J.D. Madsen. 2012. Combinations of diquat and carfentrazone-ethyl for enhanced control of floating aquatic plants. Journal of Aquatic Plant Management 50:46-48.

Cheshier, J.C., J.D. Madsen, R.M. Wersal, P.D. Gerard, and M.E. Welch. 2012. Differential susceptibility of common reed haplotypes I and M to aquatic herbicides. Invasive Plant Science and Management. 5:101-105.

Wersal, R.M. and J.D. Madsen. 2011. Comparative effects of water level variations on growth characteristics of Myriophyllum aquaticum. Weed Research 51:386-393.

Wersal, R.M., J.C. Cheshier, J.D. Madsen, and P.D. Gerard. 2011. Phenology, starch allocation, and environmental effects on Myriophyllum aquaticum. Aquatic Botany 95:194-199.

Wersal, R.M. and J.D. Madsen. 2011. Influences of water column nutrient loading on growth characteristics of the invasive aquatic macrophyte Myriophyllum aquaticum (Vell.) Verdc. Hydrobiologia. 665:93-105.

Robles, W., J.D. Madsen, and R.M. Wersal. 2011. Herbicide efficacy assessment on waterhyacinth and aquatic plant community monitoring in Lake Columbus, Mississippi. Journal of Aquatic Plant Management 49:89-93.

Cheshier, J.C., R.M. Wersal, and J.D. Madsen. 2011. The susceptibility of duckweed (Lemna minor L.) to fluridone and penoxsulam. Journal of Aquatic Plant Management 49:50-52.

Robles, W., J.D. Madsen, and R.M. Wersal. 2010. Potential for remote sensing to detect and predict herbicide injury on waterhyacinth (Eichhornia crassipes). Invasive Plant Science and Management. 3:440-450.

Wersal, R.M and J.D. Madsen. 2010. Comparison of subsurface and foliar herbicide applications for control of parrotfeather (Myriophyllum aquaticum). Invasive Plant Science and Management. 3:262-267.

Wersal, R.M., J.D. Madsen, T.E. Woolf, and N. Eckberg. 2010. Assessment of herbicide efficacy on Eurasian watermilfoil and impacts to the native submersed plant community in Hayden Lake, ID, USA. Journal of Aquatic Plant Management 48:5-11.

Wersal, R.M. and J.D. Madsen. 2010. Combinations of penoxsulam and diquat as foliar applications for control of waterhyacinth and common salvinia: Evidence of herbicide antagonism. Journal of Aquatic Plant Management 48:21-25.

Wersal, R.M., J.D. Madsen, J.H. Massey, W. Robles, and J.C. Cheshier. 2010. Comparison of daytime and night-time applications of diquat and carfentrazone-ethyl for control of parrotfeather and Eurasian watermilfoil. Journal of Aquatic Plant Management 48:56-58.

Wersal, R.M. and J.D. Madsen. 2009. Combinations of diquat and a methylated seed oil surfactant for control of common duckweed and watermeal. Journal of Aquatic Plant Management 47:59-62. 

Madsen, J.D., R.M. Wersal, K.D. Getsinger, and L.S. Nelson. 2008. Sensitivity of wild rice (Zizania palustris L.) to the aquatic herbicide triclopyr. Journal of Aquatic Plant Management 46:150-154.

Madsen, J.D. and R.M. Wersal. 2008. Growth regulation of Salvinia molesta Mitchell by pH and available water column nutrients. Journal of Freshwater Ecology 23:305-313.

Madsen, J.D., R.M. Stewart, K.D. Getsinger, R.L. Johnson, and R.M. Wersal. 2008. Aquatic plant communities in Waneta Lake and Lamoka Lake, New York. Northeastern Naturalist 15:97-110.

Wersal, R.M. and J.D. Madsen. 2007. Comparison of imazapyr and imazamox for control of parrotfeather (Myriophyllum aquaticum (Vellozo) Verdecourt). Journal of Aquatic Plant Management 45:132-135.

Madsen, J.D., R.M. Wersal, and T.E. Woolf. 2007. A new core sampler for estimating biomass of submersed aquatic macrophytes. Journal of Aquatic Plant Management 45:31-34.

Gray, C.J., J.D. Madsen, R.M. Wersal, and K.D. Getsinger. 2007. Eurasian watermilfoil and parrotfeather control using carfentrazone-ethyl. Journal of Aquatic Plant Management    45:43-46.

Wersal, R.M., J.D. Madsen, B.R. McMillan, and P.D. Gerard. 2006. Environmental factors affecting the biomass and distribution of Stuckenia pectinata in the Heron Lake System, Minnesota, USA. Wetlands 26:313-321.

Madsen, J.D., R.M. Wersal, M. Tyler, and P.D. Gerard. 2006. The distribution and abundance of aquatic macrophytes in Swan Lake and Middle Lake, Minnesota. Journal of Freshwater Ecology 21:421-429.

Wersal, R.M., B.R. McMillan, and J.D. Madsen. 2005. Food habits of dabbling ducks during fall migration in a prairie pothole system, Heron Lake, Minnesota. Canadian Field Naturalist 119:546-550.