Wisconsin Cropping Systems Weed Science Program

Weed Science Knowledge to Academics and Practitioners

University of Wisconsin-Madison

About Us

WiscWeeds Program

Our Research and Extension Program (WiscWeeds) at the University of Wisconsin-Madison focuses on agroecologically-based approaches to address sustainable weed management in corn, soybeans and small grains in Wisconsin and beyond. Our program also focuses on weed management strategies that can help address herbicide resistance, protect water quality, enhance agroecosystems services and increase food security. WiscWeeds Logo

WiscWeeds Team 2019
2019 WiscWeeds Team

WiscWeeds Team 2018
2018 WiscWeeds Team

Latest Posts

More Posts

Herein we provide the highlights and access to two technical articles for download related to our latest publication entitled: “Spray solution pH and soybean injury as influenced by synthetic auxin formulation and spray additives”.


Crop harvest is here and that means it’s time to be thinking about weed seedbank management. Check the results of our “2019-2020 Case Study: Weed Seed Movement Via Combines”.


Check our handy guide for over-the-top broadcast application windows of commonly used POST herbicides in corn and soybean.


With warmer temperatures and rainfall in the forecast, cover crops will start growing rapidly; thus, it’s important to have a solid termination plan in mind prior to crop establishment. Herein we provide some research-based info to support growers’ decisions regarding time and strategy for cover crop termination.


With the anticipated increased adoption of Enlist E3 soybeans and 2,4-D choline POST-emergence (particularly targeting waterhemp control), this is an essential time to review some of the important information regarding 2,4-D choline applications in Enlist E3 soybeans.



Data Reports & Presentations


Weed Seed Movement Via Combines: 2019-2020 Case Study (PDF)

2020 WiscWeeds Comparison of POST-emergence Corn and Soybean Herbicides (Slides)

2020 Post-emergence Corn and Soybean Herbicide Product Restrictions for Broadcast Applications (PDF)


Residual Control of Waterhemp with PRE-emergence Herbicides in Soybean (PDF)

2019 WiscWeeds Comparison of Soil Residual Herbicides in Corn (PDF)

2019 Wisconsin Weed Science Research Report (PDF)

2019 Corn Weed Control Trials (field images):

2019 Soybean Weed Control Trials (field images):

2019 Wisconsin large-scale 2,4-D drift trial (Vimeo Video)

Cover crops after corn silage: spring termination options (YouTube Video)

Early-season soybean herbicide injury (YouTube Video)

Another herbicide-resistant Palmer amaranth population detected in Wisconsin (YouTube Video)

Weed Talk: Getting the most out of glufosinate (Vimeo Video)

Industrial hemp herbicide carryover considerations (YouTube Video)

Considerations prior to cereal rye cover crop termination (Vimeo Video)


2018 Wisconsin Weed Science Research Report (PDF)

2018 UW Waterhemp Challenge: Comparison of Soil Residual Herbicides (PDF)

2018 Large-Scale Dicamba Drift Study (YouTube Video)

2018 Tips on Waterhemp Management in Wisconsin Soybeans (YouTube Video)

2018 Update on Herbicide Resistant Weeds in Wisconsin (YouTube Video)


2017 Nebraska Dicamba Survey (YouTube Video)

2017 Nebraska Cover Crop and Weed Control Survey (YouTube Video)

2017 Cover Crop Termination (YouTube Video)

Research Coalition


WiscWeeds Research Coalition - Ongoing Projects:


Given the widespread occurrence of herbicide-resistant weeds across Wisconsin Cropping Systems, the shortage of novel herbicide sites of action, and the socioeconomic and environmental challenges herbicide-resistant weeds bring to farming operations and communities, it’s time for our industry to come together and work towards a similar goal: to promote and hopefully achieve effective and sustainable weed control in crop production systems.

The objective of the WiscWeeds Research Coalition is to bring together Researchers, Educators, Policy Makers, Industry, Consultants, Service Providers, and Growers to work towards preventing the spread, reducing the selection for, and to increase the adoption of integrated management strategies to combat herbicide-resistant weed species. Through the WiscWeeds Research Coalition we expect to develop a strong relationship amongst key stakeholders allowing for effective exchange of materials, practical knowledge and research-based recommendations.

“Alone we can do so little; together we can do so much” Helen Keller

Rodrigo Werle, Nick Arneson and Dan Smith



30 Manuscripts & 1 Book Chapter


31. Soltani, N., M.C. Oliveira, G.S. Alves, R. Werle, J.K. Norsworthy, C.L. Sprague, B.G. Young, D.B. Reynolds, A. Brown, and P. Sikkema. 2020. Large-scale off-target movement assessment of dicamba in North America. Weed Technology.34:318-330.

30. Sciarresi, C., C. Proctor, E.R. Haramoto, L.E. Lindsey, G.I. Carmona, R. Elmore, S. Everhart, W. Looker, M. Marroquin-Guzman, J. McMechan, J. Wehrbein, R. Werle, and M. Salmeron. 2020. Evaluating short-season soybean management adaptations for cover crop rotations with a crop simulation model. Field Crops Research. 250:107734.

29. B.C. Vieira, J.D. Luck, K.L. Amundsen, R. Werle, T.A. Gaines, and G.R. Kruger. 2020. Herbicide drift exposure leads to reduced herbicide sensitivity in Amaranthus spp. Scientific Reports. 10:2146.


28. Vieira, B.C., J.D. Luck, K.L. Amundsen, T.A. Gaines, R. Werle, and G.R. Kruger. 2019. Response of Amaranthus spp. following exposure of sublethal herbicide rates via spray particle drift. PLoS ONE. 14(7).

27. Oliveira, M., L. Butts, and R. Werle. 2019. Assessment of cover crop management strategies in Nebraska, US. 2019. Agriculture. 9(6):124.

26. Lo, T.H., D.R. Rudnick, C.A. Burr, M.C. Stockton, and R. Werle. 2019. Approaches to evaluating grower irrigation and fertilizer nitrogen amount and timing. Agricultural Water Management. 213:693-706. Accepted Directly by the Editor Due to High Quality and Relevance to Readers.


25. Werle, R., M.C. Oliveira, A.J. Jhala, C.A. Proctor, J. Rees, and R. Klein. 2018. Survey of Nebraska farmers’ adoption of dicamba-resistant soybean technology and dicamba off-target movement. Weed Technology. 32:754-761.

24. Butts, T.R., B.C. Vieira, D.O. Latorre, R. Werle, and G. Kruger. 2018. Competitiveness of herbicide-resistant waterhemp (Amaranthus tuberculatus) with soybeans. Weed Science. 66:729-737.

23. Oliveira, M.C., G.A.M. Pereira, E.A. Ferreira, J.B. Santos, S.Z. Knezevic, and R. Werle. 2018. Additive design: the concept and data analysis. Weed Research. 58:335-347.

22. Vennapusa, A.R., F. Faleco, B. Vieira, S. Samuelson, G.R. Kruger, R. Werle, and M. Jugulam. 2018. Prevalence and mechanism of atrazine resistance in common waterhemp (Amaranthus tuberculatus) from Nebraska. Weed Science. 66:595-601.

21. Stepanovic, S.V., C. Burr, J.A. Peterson, D. Santra, D. Rudnick, T. Adesemoye, C.F. Creech, and R. Werle. 2018. Field peas response to seeding rate, depth and inoculant in west-central Nebraska. Agronomy Journal. 110:1412-1419.

20. Werle, R., and J. Miller. 2018. Survey of Nebraska soybean producers: current and future status of weed management. Journal of Extension. 56(2).

19. Werle, R., C. Burr, and H. Blanco-Canqui. 2018. Cereal rye cover crop suppresses winter annual weeds. Canadian Journal of Plant Science. 98:498-500.

18. Vieira, B.C., S.L. Samuelson, G.S. Alves, T.A. Gaines, R. Werle, and G.R. Kruger. 2018. Distribution of glyphosate-resistant Amaranthus spp. in Nebraska. Pest Management Science. Wiley Online Library. DOI 10.1002/ps.4781

17. Rudnick, D.R., T. Lo, J. Singh, R. Werle, F. Munoz-Arriola, T. Shaver, C.A. Burr, T.J. Dorr. 2018. Reply to comments on “Performance assessment of factory and field calibrations for electromagnetic sensors in a loam soil”. Agricultural Water Management. 203:272-276.

16. Singh, J., T. Lo, D.R. Rudnick, T.J. Dorr, C.A. Burr, R. Werle, T.M. Shaver, F. Munoz-Arriola. 2018. Performance assessment of factory and field calibrations for electromagnetic sensors in a loam soil. Agricultural Water Management. 196:87-98.

15. Elmore, R.W., R. Werle, C. Wortmann, P. Tukamuhabwa, and N. Mueller. 2018. Sustainable soybean production research and practice: contrasting case studies from three soybean production areas. Nguyen, H. (ed.), Achieving sustainable cultivation of soybeans Volume 1: Breeding and cultivation techniques, Burleigh Dodds Science Publishing, Cambridge, UK (ISBN: 978 1 78676 112 5)


14. Barnes, E., R. Werle, L.D. Sandell, J.L. Lindquist, S.Z. Knezevic, P.H. Sikkema, and A. Jhala. 2017. Influence of tillage on common ragweed (Ambrosia artemisiifolia) emergence pattern in Nebraska. Weed Technology. 31:623-631.

13. Werle, R., K. Begcy, M. K. Yerka, I. Dweikat, A. J. Jhala, J. P. Mower, and J. L. Lindquist. 2017. Independent evolution of acetolactate synthase-inhibiting herbicide resistance in weedy Sorghum populations across common geographic regions. Weed Science. 65:164-176.

12. Werle, R., B. Tenhumberg, and J. L. Lindquist. 2017. Modeling the evolution of shattercane resistance to ALS-inhibiting herbicides in an ALS-tolerant sorghum cropping system. Ecological Modeling. 343:131-141.


11. Saini, S., R. Werle, L.D. Sandell, and A. Jhala. 2016. Spring-tillage has no effect on the emergence pattern of glyphosate-resistant giant ragweed (Ambrosia trifida L.) in Nebraska. Canadian Journal of Plant Science. 96: 726-729.

10. Werle, R., A. Jhala, M.K. Yerka, J.A. Dille, and J.L. Lindquist. 2016. Distribution of herbicide-resistant shattercane and johnsongrass populations in sorghum production areas of Nebraska and northern Kansas. Agronomy Journal. 108:321-328. Invited Submission.


9. Werle, R., L.J. Giesler, M.L. Bernards, and J.L. Lindquist. 2015. Likelihood of soybean cyst nematode (Heterodera glycines) reproduction on henbit (Lamium amplexicaule) roots in Nebraska. Weed Technology. 29:35-41.

8. Werle, R., L.D. Sandell, D.D. Buhler, R.G. Hartzler, and J.L. Lindquist. 2014. Predicting emergence of twenty three summer annual weed species. Weed Science. 62:267-279.


7. Werle, R., M.L. Bernards, T.J. Arkebauer, and J.L. Lindquist. 2014. Environmental triggers of winter annual weed emergence in the midwestern United States. Weed Science. 62:83-96.

6. Werle, R., L.L. Perez, L.D. Sandell, and J.L. Lindquist. 2014. Corn (Zea mays) emergence and early growth as influenced by tansymustard (Descurainia pinnata) residue. Crop Management. doi:10.2134/CM-2013-0088-RS.

5. Werle, R., J.J. Schmidt, J. Laborde, A. Tran, C. Creech, and J.L. Lindquist. 2014. Shattercane X ALS-resistant sorghum F1 hybrid and shattercane interference in ALS-resistant sorghum. Journal of Agricultural Science. 6:159-165.


4. Werle, R., M.L. Bernards, L.J. Giesler, and J.L. Lindquist. 2013. Influence of two herbicides on soybean cyst nematode (Heterodera glycines) reproduction on henbit (Lamium amplexicaule) roots. Weed Technology. 27:41-46. Outstanding paper in Weed Technology.


3. Han, C., C. Borman, D. Osantowski, J. Wagnitz, K. Koehler-Cole, K. Korus, E. Sonderegger, R. Werle, T. Wood, and J. L. Lindquist. 2012. Productivity of field pea (Pisum sativum L.) and spring oat (Avena sativa L.) grown as sole and intercrops under different nitrogen levels. Journal of Agricultural Science. 4:136-143.


2. Rosolem, C.A., R. Werle, R.A. Garcia. 2010. Nitrogen washing from C3 and C4 cover grasses residues by rain. Revista Brasileira de Ciência do Solo. 34:1899-1905.


1. Werle, R., R.A. Garcia, C.A. Rosolem. 2008. Potassium leaching as affected by soil texture and potassium availability. Revista Brasileira de Ciência do Solo. 32:2297-2305 (In Portuguese with English abstract).


WiscWeeds Lab

Rodrigo Werle (Assistant Professor & Extension Cropping Systems Weed Scientist):

Rodrigo Werle
Dr. Werle is an Assistant Professor and Extension Cropping Systems Weed Scientist at UW-Madison (from Sao Paulo, Brazil; BS from Sao Paulo State University, and MS and PhD from University of Nebraska-Lincoln) leading the Research and Extension efforts of the WiscWeeds Program (See “Werle Bio” tab for additional information).

Nick Arneson (Weed Science Outreach Specialist):

Ryan DeWerff
Nick is an Outreach Specialist at UW-Madison (from Omaha, Nebraska; BS and MS from University of Nebraska-Lincoln) coordinating the WiscWeeds Lab activities, Extension programming, and circulation of outreach publications.

Ryan DeWerff (Weed Science Research Specialist):

Ryan DeWerff
Ryan is a Research Specialist at UW-Madison (from Nokomis, Illinois; BS from University of Illinois and MS from University of Wisconsin-Madison) managing the Wisconsin Herbicide Evaluation Program and providing technical assistance for ongoing program and graduate student research projects.

Maxwel Coura Oliveira (Weed Science Postdoctoral Research Associate):

Maxwel Oliveira
Dr. Oliveira is a Postdoctoral Research Associate at UW-Madison (from Minas Gerais, Brazil; BS and MS from Federal University of Jequitinhonha and Mucuri Valleys, and PhD from University of Nebraska-Lincoln) investigating the distribution and management of herbicide-resistant weeds in Wisconsin and evaluating weed management strategies in corn, soybeans, and small grains. He trains the Badger Weeds Team, mentors graduate and undergraduate students in the Cropping Systems Weed Science program and assists with the Wisconsin Herbicide Evaluation Program.

Dan Smith (UW-NPM Southwest Wisconsin Regional Agronomy Specialist):

Dan Smith

Dan is a Southwest Regional Agronomist for the UW-Madison Nutrient and Pest Management Program (from Walnut, Illinois; BS from University of Wisconsin-Platteville and MS from University of Wisconsin-Madison) providing technical assistance towards weed science research and outreach activities.

Sarah Striegel (MS Weed Science Graduate Student):

Sarah Striegel
Sarah is an MS graduate student at UW-Madison (from What Cheer, Iowa; BS from Iowa State University) working on optimizing dicamba use in RR2Xtend soybean systems and mitigating potential for off-target movement.

Nikola Arsenijevic (MS Weed Science Graduate Student):

Nikola Arsenijevic
Nikola is an MS graduate student at UW-Madison (from Serbia; BS from University of Belgrade) working on evaluating the influence of PRE herbicides on early season soybean development and the impact of cultural, mechanical, and chemical practices on rate of soybean canopy closure development and weed suppression.

Victor Ribeiro (Visiting MS Weed Science Graduate Student):

Victor Ribeiro
Victor is a visiting MS graduate student at UW-Madison (from Minas Gerais, Brazil; BS from Federal University of Jequitinhonha & Mucuri Valleys) working on evaluating the soil residual activity of multiple single active ingredient PRE-emergence soybean herbicides and their effect on soybean nodulation and N fixation.

Felipe Faleco (MS Weed Science Graduate Student):

Felipe Faleco
Felipe is an MS graduate student at UW-Madison (from Sao Paulo, Brazil; BS from Sao Paulo State University) working on evaluating the distribution of herbicide resistance in waterhemp, Palmer amaranth and giant ragweed populations from Wisconsin.

Kolby Grint (MS Weed Science Graduate Student):

Felipe Faleco
Kolby is an UW-Madison MS graduate student (from Sargent, Nebraska; BS from University of Nebraska-Lincoln) working on evaluating the effects of cover crops on herbicide carryover and weed seedbank distribution in corn-soybean cropping systems.

Haleigh Ortmeier-Clarke (MS Weed Science Graduate Student):

Felipe Faleco
Haleigh is an MS graduate student at UW-Madison (from Stayton, Minnesota; BS from University of Minnesota) working on evaluating cultivation methods for industrial hemp production.

Jose Jr. Nunes (Visiting MS Weed Science Graduate Student):

Jose Jr Nunes
Jose Jr. is a visiting MS graduate student at UW-Madison (from Mato Grosso, Brazil; BS from the University of Cuiaba) working on the impact of soil and cover crop management strategies on the deposition and fate of PRE-emergence herbicides in soybean cropping systems. In Brazil he is investigating goosegrass (Eleusine indica) resistance to glyphosate, clethodim, and haloxyfop-methyl.

Alex Rosa (PhD Agronomy Graduate Student - University of Nebraska):

Victor Ribeiro
Alex is a PhD graduate student at UNL (from Rio Grande do Sul, Brazil; BS from Federal University of Rio Grande do Sul and MS from Kansas State University) working on evaluating the impact of wheat stubble management and cover crops on semi-arid rainfed cropping systems of western Nebraska.

Former Lab Members

No one has left (thankfully) or graduated from our program yet!