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Department of Plant Sciences

Andrew R. Kniss, Ph.D.

Andrew R. Kniss

Associate Professor

Office: 307-766-3949
Fax: 307-766-5549


2006 - Ph.D. Agronomy, Minor: Statistics, University of Wyoming
2003 - M.S. Agronomy, University of Nebraska - Lincoln
2001 - B.S. Agroecology, University of Wyoming


My research program focuses on developing sustainable weed management programs in agronomic crops, especially sugarbeet, winter wheat, corn, and dry beans. Recent research projects include:

  • long-term management of jointed goatgrass in imidazolinone-resistant (Clearfield) winter wheat
  • synergistic herbicide combinations for management of feral rye
  • new herbicide options in proso millet
  • effect of long-term glyphosate use in glyphosate-resistant (Roundup Ready) cropping systems,
  • use of ethofumesate in glyphosate-resistant (Roundup Ready) sugarbeet,
  • management of volunteer corn in dry beans and sugarbeet.

  • American Society of Sugar Beet Technologists
  • Weed Science Society of America
  • North Central Weed Science Society
  • Western Society of Weed Science
  • Western Society of Crop Science


Selected publications:

Kniss, A.R. and C.W. Coburn. 2015. Quantitative evaluation of the Environmental Impact Quotient (EIQ) for Comparing Herbicides. PLOS ONE. 10.1371/journal.pone.0131200 

Douglass, C.H., S.J. Nissen, G. Brunk, and A.R. Kniss. 2015.  Efficacy and environmental fate of imazapyr from directed helicopter applications targeting Tamarix species infestations in Colorado, USA. Pest Management Science. DOI: 10.1002/ps.4016

Ritz, C., A.R. Kniss, and J.C. Streibig. 2015. Research Methods in Weed Science: Statistics. Weed Science. Special Issue:166-187. DOI: 10.1614/WS-D-13-00159.1

Hergert, H., B.A. Mealor, and A.R. Kniss. 2015. Inter- and intraspecific variation in native restoration plants for herbicide tolerance. Ecological Restoration. 33:74-81

Omondi, E. and A.R. Kniss. 2014. Interplanting Annual Ryegrass, Wheat, Oat, and Corn to Mitigate Iron Deficiency in Dry Beans. PLOS ONE. 9(12):e115673. DOI: 10.1371/journal.pone.0115673

Lee, B., J. Ritten, A. Kniss, and C. Bastian. 2014. Profitability Comparison for Glyphosate-Resistant and Conventional Sugarbeet Production Systems. Journal of Sugar Beet Research. 51:2-13

Reddy, K.J., A.J. Whitman, and A.R. Kniss. 2014. Potential beneficial uses of coalbed natural gas (CBNG) water. Environmental Science: Processes & Impacts. 16:148-158

Kniss, A.R. and D.C. Odero. 2013. Interaction between preemergence ethofumesate and postemergence glyphosate. Weed Technology. 27:47-53

Kniss, A.R., G.M. Sbatella, and R.G. Wilson. 2012. Volunteer corn interference and control in glyphosate-resistant sugarbeet. Weed Technology. 26:348-355

Kniss, A.R., J.D. Vassios, S.J. Nissen, and C. Ritz. 2011. Nonlinear regression analysis of herbicide absorption studies. Weed Science. 59:601-610

Kniss, A.R., D.J. Lyon, J. Vassios, and S. Nissen. 2011. MCPA synergizes imazamox for feral rye control. Weed Technology. 25:303-309

Odero, D.C., A. Mesbah, S.D. Miller, and A.R. Kniss. 2011. Redstem filaree interference in sugarbeet. Weed Science. 59:310-313

Kniss, A.R. and D.J. Lyon. 2011. Winter wheat response to pre-plant applications of aminocyclopyrachlor. Weed Technology. 25:51-57

Kniss, A.R. 2010. Comparison of conventional and glyphosate-resistant sugarbeet the year of commercial introduction in Wyoming. Journal of Sugar Beet Research. 47:127-134

Lyon, D.J. and A.R. Kniss. 2010. Proso millet tolerance to saflufenacil. Weed Technology. 24:349-355 

Enloe, S.F., A.R. Kniss, M. Ferrell, and J. LaFantasie. 2009. Black greasewood (Sarcobatus vermiculatus), gray rabbitbrush (Chrysothamnus nauseosa) and perennial grass response to chlorsulfuron and metsulfuron. Invasive Plant Science and Management. 2:247-252

Enloe, S.F., and A.R. Kniss. 2009. Influence of Diflufenzopyr Addition to Picolinic Acid Herbicides for Russian Knapweed (Acroptilon repens) Control. Weed Technology. Weed Technology. 23:450-454

Kniss, A.R. D.J. Lyon, and S.D. Miller. 2008. Jointed Goatgrass Management with Imazamox-Resistant Cultivars in a Winter Wheat-Fallow Rotation. Crop Science. 48:2414-2420

Kniss, A.R., S.D. Miller, P.H. Westra, and R.G. Wilson. 2007. Glyphosate susceptibility in common lambsquarters (Chenopodium album) is influenced by parental exposure. Weed Science. 55:572-577

Wilson, R.G., S.D. Miller, P.H. Westra, A.R. Kniss, P.W. Stahlman, G.W. Wicks, and S.D. Kachman. 2007. Glyphosate-Induced Weed Shifts in Glyphosate-Resistant Corn or a Rotation of Glyphosate-Resistant Corn, Sugarbeet and Spring Wheat. Weed Technology. 21:900-909

Larson, R.L, A.L. Hill, A. Fenwick, A.R. Kniss, L.E. Hanson and S.D. Miller. 2006. Influence of glyphosate on Rhizoctonia and Fusarium root rot in sugar beet. Pest Management Science. 62:1182-1192

Kniss, A.R., R.G. Wilson, A.R. Martin, P.A. Burgener, and D.M. Feuz. 2004. Economic evaluation of glyphosate-resistant and conventional sugarbeet (Beta vulgaris). Weed Technology. 18:388-396

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