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Department of Plant Sciences

Dept. 3354

1000 E University Ave.

Laramie, WY 82071

Phone: 307-766-3103


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Dr. Andrew Kniss

Department Head, Professor of Weed Science

Office: Ag C 50
Phone: (307) 766-3949



The main objective of my research is to develop sustainable weed management programs, especially in agronomic crops like sugarbeet, winter wheat, corn, and dry beans. My research program is relatively diverse in scope, but most of my research program fits within the following themes:

  • non-target impacts of weed management
  • herbicide physiology
  • weed seedbank ecology
  • weed management in sugarbeet
  • new herbicide uses
  • herbicide resistant crops
Dr. Andrew Kniss


PLNT 3030 - Ecology of Plant Protection

PLNT 4070/5070 - Weed Science & Technology

PLNT 5080 - Applied Statistical Programming for the Plant Sciences

Selected Publications:

Ballenger JG, Adjesiwor AT, Claypool DA, Kniss AR (2024) Relative contribution of shade avoidance and resource competition to early-season sugar beet yield loss due to weeds. Weed Science.

Adamson DM, Sbatella GM, Dayan F, Kniss AR (2024) Reduced irrigation impact on soil applied herbicide dissipation and rotational crop response. Weed Technology.

Yadav R, Jha P, Kniss AR, Lawrence NC, Sbatella GM (2023) Effect of osmotic potential and temperature on germination of kochia (Bassia scoparia) populations from the U.S. Great Plains. Weed Science.

Saleh OS, Kniss AR (2022) The growth behaviour of winter wheat (Triticum aestivum L.) in presence of inter- and intra-specific neighbours. Canadian Journal of Plant Science.

Kniss AR, Adjesiwor AT, Lawrence NC, Mosqueda EM (2022) The cost of implementing effective herbicide mixtures for resistance management. Advances in Weed Science. (Invited paper)

Adjesiwor AT, Ballenger J, Weinig C, Ewers BE, Kniss AR (2021) Plastic response to early shade avoidance cues has season-long effect on Beta vulgaris growth and development. Plant, Cell & Environment.

Carabajal-Capitan, S, Kniss AR, Jabbour R (2021) Seed predation of interseeded cover crops and resulting impacts on ground beetles. Environmental Entomology.

Adjesiwor AT, Kniss AR (2020) Light reflected from different plant canopies affected Beta vulgaris growth and development. Agronomy.

Mosqueda EM, Sbatella GM, Jha P, Lawrence NL, Kniss AR (2020) Effect of Crop Canopy and Herbicide Application on Kochia (Kochia scoparia) Density and Seed Production. Weed Science.

Adjesiwor AT, Claypool DA, Kniss AR (2020) Dry bean response to preemergence flumioxazin. Weed Technology.

Sbatella GM, Adjesiwor A, Kniss AR, Stahlman P, Geier P, Westra P, Wilson R, Moechnig M, Cole R, and Tichota J. (2019) Herbicide options for glyphosate-resistant kochia (Bassia scoparia) management in the Great Plains. Weed Technology.

Schambow T, Adjesiwor A, Lorent L, Kniss AR (2019) Shade avoidance cues reduce Beta vulgaris growth. Weed Science.

Soltani N, Dille JA, Robinson DE, Sprague CL, Morishita DW, Lawrence NC, Kniss AR, Jha P, Felix J, Nurse RE, Sikkema PH (2018) Potential yield loss in sugar beet due to weed interference in the United States and Canada. Weed Technology.

Kniss AR (2018) Soybean response to dicamba: A meta-analysis. Weed Technology.

Mallory-Smith C, Kniss AR, Lyon D, Zemetra RS (2018) Jointed goatgrass (Aegilops cylindrica): A review. Weed Science.

Soltani N, Dille JA, Gulden RH, Sprague CL, Zollinger RK, Morishita D, Lawrence NC, Sbatella GM, Kniss AR, Jha P, Sikkema PH (2018) Potential yield loss in dry bean due to weeds in the United States and Canada. Weed Technology.

Coburn CW, Adjesiwor AA, Kniss AR (2018) Creeping bellflower response to glyphosate and synthetic auxin herbicides. HortTechnology.

Dille JA, Stahlman PW, Du J, Geier PW, Riffel JD, Currie RS, Wilson RG, Sbatella GM, Westra P, Kniss AR, Moechnig MJ, Cole RM (2017) Kochia (Kochia scoparia) emergence profiles and seed persistence across the Central Great Plains. Weed Science.

Kniss AR (2017) Genetically Engineered Herbicide-Resistant Crops and Herbicide-Resistant Weed Evolution in the United States. Weed Science.

Kniss AR (2017) Long-term trends in the intensity and relative toxicity of herbicide use. Nature Communications.

Gaines TA, Barker AL, Patterson EL, Westra P, Westra EP, Wilson RG, Jha P, Kumar V, Kniss AR  (2016) EPSPS Gene Copy Number and Whole-Plant Glyphosate Resistance Level in Kochia scoparia. PLoS ONE

Kniss AR, Savage SD, Jabbour R (2016) Commercial Crop Yields Reveal Strengths and Weaknesses for Organic Agriculture in the United States. PLOS ONE. (CORRECTED PDF | Original article)

Greet BJ, Mealor BA, Kniss AR (2016) Response of Delphinium occidentale and associated vegetation to aminocyclopyrachlor. Rangeland Ecology & Management.

Sbatella GM, Kniss AR, Omondi EC, Wilson RG (2016) Volunteer corn (Zea mays) interference in dry bean (Phaseolus vulgaris). Weed Technology.

Douglass CH, Nissen SJ, Meiman PJ Kniss AR (2016) Impacts of imazapyr and triclopyr soil residues on the growth of several restoration species. Rangeland Ecology & Management.

Kniss AR and Coburn CW (2015) Quantitative evaluation of the Environmental Impact Quotient (EIQ) for comparing herbicides. PLoS ONE.

Lee B, Ritten J, Bastian C Kniss A (2015) Profitability of glyphosate-resistant sugarbeet production in whole farm systems. Journal of the American Society of Farm Managers and Rural Appraisers.

Douglass CH, Nissen SJ, Brunk G Kniss AR (2015) Efficacy and environmental fate of imazapyr from directed helicopter applications targeting Tamarix species infestations in Colorado, USA. Pest Management Science.

Ritz C, Kniss AR Streibig JC (2015) Research Methods in Weed Science: Statistics. Weed Science.

Hergert H, Mealor BA Kniss AR (2015) Inter- and intraspecific variation in native restoration plants for herbicide tolerance. Ecological Restoration.

Omondi EC and Kniss AR (2014) Interplanting Annual Ryegrass, Wheat, Oat, and Corn to Mitigate Iron Deficiency in Dry Beans. PLOS ONE.

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

Reddy KJ, Whitman AJ Kniss AR (2014) Potential beneficial uses of coalbed natural gas (CBNG) water. Environmental Science: Processes & Impacts.

Kniss AR and Odero DC (2013) Interaction between preemergence ethofumesate and postemergence glyphosate. Weed Technology.

Kniss AR, Sbatella GM Wilson RG (2012) Volunteer corn interference and control in glyphosate-resistant sugarbeet. Weed Technology.

Kniss AR, Vassios JD, Nissen SJ Ritz C (2011) Nonlinear regression analysis of herbicide absorption studies. Weed Science.

Kniss AR, Lyon DJ, Vassios JD Nissen SJ (2011) MCPA synergizes imazamox for feral rye control. Weed Technology.

Odero DC, Mesbah AO, Miller SD Kniss AR (2011) Interference of redstem filaree (Erodium cicutarium) in sugarbeet. Weed Science.

Kniss AR and Lyon DJ (2011) Winter wheat response to pre-plant applications of aminocyclopyrachlor. Weed Technology.

Kniss AR (2010) Comparison of conventional and glyphosate-resistant sugarbeet the year of commercial introduction in Wyoming. Journal of Sugar Beet Research.

Odero DC, Mesbah A, Miller SD Kniss AR 2010. Lanceleaf sage (Salvia reflexa) interference in sugarbeet. Weed Technology.

Lyon DJ and Kniss AR (2010) Proso millet tolerance to saflufenacil. Weed Technology.

Odero DC, Mesbah AO, Miller SD Kniss AR (2010) Wild Buckwheat (Polygonum convolvulus) Interference in Sugarbeet. Weed Technology.

Odero DC, Mesbah AO, Miller SD Kniss AR (2009) Venice Mallow (Hibiscus trionum) Interference in Sugarbeet. Weed Technology.

Enloe SF and Kniss AR (2009) Does a Diflufenzopyr Plus Dicamba Premix Synergize Russian Knapweed Control with Auxinic Herbicides? Invasive Plant Science and Management.

Enloe SF, Kniss AR, Ferrell M LaFantasie J (2009) Black greasewood (Sarcobatus vermiculatus), gray rabbitbrush (Chrysothamnus nauseosa) and perennial grass response to chlorsulfuron and metsulfuron. Invasive Plant Science and Management.

Enloe SF and Kniss AR (2009) Influence of Diflufenzopyr Addition to Picolinic Acid Herbicides for Russian Knapweed (Acroptilon repens) Control. Weed Technology. Weed Technology.

Kniss AR, Lyon DJ Miller SD (2008) Jointed Goatgrass Management with Imazamox-Resistant Cultivars in a Winter Wheat-Fallow Rotation. Crop Science. (Raw data)

Kniss AR, Miller SD, Westra P Wilson RG (2007) Glyphosate susceptibility in common lambsquarters (Chenopodium album) is influenced by parental exposure. Weed Science.

Wilson RG, Miller SD, Westra PH, Kniss AR, Stahlman PW, Wicks GW Kachman SD (2007) Glyphosate-Induced Weed Shifts in Glyphosate-Resistant Corn or a Rotation of Glyphosate-Resistant Corn, Sugarbeet and Spring Wheat. Weed Technology.

Lyon DJ, Kniss A Miller SD (2007) Carfentrazone Improves Broadleaf Weed Control in Proso and Foxtail Millets. Weed Technology.

Larson RL, Hill AL, Fenwick A, Kniss AR, Hanson LE Miller SD (2006) Influence of glyphosate on Rhizoctonia and Fusarium root rot in sugar beet. Pest Management Science.

Kniss AR, Wilson RG, Martin AR, Burgener PA Feuz DM (2004) Economic evaluation of glyphosate-resistant and conventional sugarbeet (Beta vulgaris). Weed Technology.


Contact Us

Department of Plant Sciences

Dept. 3354

1000 E University Ave.

Laramie, WY 82071

Phone: 307-766-3103


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