College of Agricultural Sciences Personnel Profile
Personnel Photo
Philip Westra
Professor
Bioagricultural Sciences and Pest Management
College of Agricultural Sciences

Weed Research Laboratory Building, Room 112
Phone:
970-491-5219
Education:
  • Ph D, U OF MINNESOTA; AGRONMY
  • Other, CALVIN COLLEGE; SCND ED
  • Other, U OF WISCONSIN; PHILOS
Website:
http://

This content comes from the "Personal and Contact Information" screen's "Brief Biography"
Please enter your biography there to see it here.

Gaines, Todd, Barker, Abigail Lynn, Patterson, Eric, Westra, Philip, Westra, Eric Philip, Wilson, Robert G., Jha, Prashant, Kumar, Vipan, Kniss, Andrew R., (2016) EPSPS gene copy number and whole-plant glyphosate resistance level in Kochia scoparia PLOS ONE 11 12 e0168295

Li, Zhenyi, Kessler, Kallie Christine, Figueiredo, Marcelo Rodrigues Alves de, , Nissen, Scott J, Gaines, Todd, Westra, Philip, Acker, Rene C. Van, Hall, Christopher, Robinson, Darren E., Soltani, Nader, Sikkema, Peter H., (2016) Halosulfuron absorption, translocation, and metabolism in white and adzuki bean Weed Science 64 4 705-711

Sebastian, Derek J, Nissen, Scott J, Westra, Philip, Shaner, Dale, Butters, Gregory, (2016) Influence of Soil Properties and Soil Moisture on the Efficacy of Indaziflam and Flumioxazin on Kochia scoparia Pest Management Science

Ostlie, M., Haley, Scott D, Anderson, Victoria Ashley, Shaner, D., Manmathan, Harish Kumarimandhiram, Beil, Craig Thomas, Westra, Philip, (2015) Development and characterization of mutant winter wheat (Triticum aestivum L.) accessions resistant to the herbicide quizalofop Theoretical and Applied Genetics 128 2 343-351

Wiersma, A.T., Gaines, Todd, Preston, C., Hamilton, J.P., Giacomini, D., Buell, C Robin, Leach, Jan E, Westra, Philip, (2015) Gene amplification of 5-enol-pyruvylshikimate-3-phosphate synthase in glyphosate-resistant Kochia scoparia Planta 241 463-474

Nandula, Vijay K, Wright, Alice A, Van Horn, Christopher R, Molin, William T, Westra, Philip, Reddy, Krishna N, (2015) Glyphosate Resistance in Giant Ragweed (Ambrosia trifida L.) from Mississippi Is Partly Due to Reduced Translocation American Journal of Plant Sciences 6 13 2104-2113

Kumar, V., Jha, P., Giacomini, D., Westra, Eric Philip, Westra, Philip, (2015) Molecular Basis of Evolved Resistance to Glyphosate and Acetolactate Synthase-Inhibitor Herbicides in Kochia (Kochia scoparia) Accessions from Montana Weed Science 63 4 758-769

Ostlie, Mike, Haley, Scott D, Manmathan, Harish Kumarimandhiram, Westra, Philip, (2015) Development and characterization of mutant winter wheat (Triticum aestivum L.) accessions resistant to the herbicide quizalofop. Theoretical and Applied Genetics

Lorentz, L, Gaines, Todd, Nissen, Scott J, Westra, Philip, Strek, H., Dehne, H.W., Ruiz-Santaella, J. P., Beffa, R, (2014) Characterization of glyphosate resistance in Amaranthus tuberculatus populations Journal of Agricultural and Food Chemistry 62 8134-8142

Juglam, Mithla, Niehues, Kindsey, Godar, Amar, Wiersma, Andrew, Westra, Philip , (2014) Tandem Amplification of a Chromosomal Segment Harboring EPSPS Locus Confers Glyphosate Resistance in Kochia Scoparia Plant Physiology

Giacomini, Darci A, Westra, Philip, Ward, Sarah M, (2014) Impact of genetic background in fitness cost studies: an example from glyphosate-resistant Palmer amaranth Weed Science 62 29-37

Lindenmayer, Richard B, Nissen, Scott J, Westra, Philip, Shaner, Dale L, Brunk, Galen R, (2013) Aminocyclopyrachlor absorption, translocation, and metabolism in field bindweed (Convolulus arvensis) Weed Sci 16 63-67

Graus, M, Allyson, S D, Fall, R, Yuan, B, Qian, Yaling, Westra, Philip, Gouw, J, Warneke, C, (2013) Biosphere-atmosphere exchange of volatile organic compounds over C4 biofuel crops Atmospheric Environment 66 161-168

Gaines, Todd, Wright, A.A., Molin, W.M., Lorentz, L., Riggins, C. W., Tranel, P. J., Beffa, R., Westra, Philip, Powles, S.B., (2013) Identification of genetic elements associated with EPSPS gene amplification PLOS One 8 6 e65819

Johnson, Jerry J, Haley, Scott D, Jones, Sally Marie, Larson, Kevin, Bartolo, Michael E, Davidson, Jeffery William, Peairs, Frank B, Tisserat, Ned A, Westra, Philip, Davis, Jessica Gwyn, Novak, Rick Allen, Vigil, Merle, Mostek, Glenda, Bosley, Bruce, Meyer, Ron, Trujillo, Wilma, Irell, Ben, (2013) "Making better decisions: 2013 Colorado wheat variety performance trials." AES TR13-4 51

(2012) Inheritance of evolved glyphosate resistance in a North Carolina Palmer amaranth (Amaranthus palmeri) biotype Int J of Agronomy

(2012) Interspecific hybridization transfers a previously unknown glyphosate resistance mechanism in Amaranthus species Evolutionary Applications 5 1 29-38

Gaines, Todd, Ward, Sarah M, Bukun, B., Preston, C., Leach, Jan E, Westra, Philip, (2012) Interspecific hybridization transfers a previously unknown glyphosate resistance mechanism in Amaranthus species Evolutionary Applications 5 29-38

(2012) Phenotypic diversity of Aegilops cylindrica (jointed goatgrass) accessions from the western United States under irrigated and dryland conditions Agriculture, Ecosystems, & Environment - online ahead of print

(2012) Why Early Season Weed Control Is Important in Maize Weed Science: July-September 60 3 423-430

(2011) Backcrossing provides an avenue for gene introgression from wheat to jointed goatgrass (Aegilops cylindrica) in the US Great Plains Weed Science 59 188-194

Econopouly, Bethany F, McKay, John K, Westra, Philip, Lapitan, Nora L V, Chapman, Phillip Lee, Byrne, Patrick F, (2011) Backcrossing Provides an Avenue for Gene Introgression from Wheat to Jointed Goatgrass (Aegilops cylindrica) in the US Great Plains Weed science 59 2 188–194

(2011) Biosphere-atmosphere exchange of volatile organic compounds over C4 biofuel crops Atmospheric Environment, available online

(2011) Interspecific hybridization transfers a previously unknown glyphosate resistance mechanism in Amaranthus species Evolutionary Applications On-line publication

(2011) Mechanism of resistance of evolved glyphosate-resistant Palmer Amaranth (Amaranthus palmeri) J Agric Food Chem 59 5886-5889

Gaines, Todd, Shaner, D. L., Ward, Sarah M, Leach, Jan E, Preston, C., Westra, Philip, (2011) Mechanism of resistance of evolved glyphosate-resistant Palmer amaranth (Amaranthus palmeri) Journal of Agricultural and Food Chemistry 59 5886-5889

(2010) Absorption and Translocation of Aminocyclopyrachlor and Aminocyclopyrachlor-Methyl Ester in Canada Thistle (Cirsium arvense) Weed Sci 58 96-102

(2010) Comparison of the Interactions of Aminopyralid vs. Clopyralid with Soil Weed Science: October-December 58 4 473-477

(2010) Gene amplification confers glyphosate resistance in Amaranthus palmeri P Natl Acad Sci USA 107 1029-1034

Gaines, Todd, Zhang, W., Wang, D., Bukun, B., Chisholm, Stephen T, Shaner, D. L., Nissen, Scott J, Patzoldt, W. L., Tranel, P. J., Culpepper, A. S., Grey, T. L., Webster, T. M., Vencill, W. K., Sammons, R. D., Jiang, J.M., Preston, C., Leach, Jan E, Westra, Philip, (2010) Gene amplification confers glyphosate resistance in Amaranthus palmeri Proceedings of the National Academy of Sciences of the United States of America 107 3 1029-1034

Harrington, Judith Eileen, Byrne, Patrick F, Peairs, Frank B, Nissen, Scott J, Westra, Philip, Ellsworth, Peter C, Fournier, Al, Mallory-Smith, Carol A, Zemetra, Robert S, Henry, W Brien, (2010) Perceived consequences of herbicide-tolerant and insect-resistant crops on integrated pest management strategies in the western United States: Results of an online survey AgBioForum

(2010) Vapor Movement of Synthetic Auxin Herbicides Weed Sci 58 103-108

(2009) Aminopyralid and Clopyralid Absorption and Translocation in Canada Thistle (Cirsium arvense) Weed Sci 57 15-Oct

Bukun, Bekir, Gaines, Todd, Nissen, Scott J, Westra, Philip, Brunk, Galen R, Shaner, Dale L, Sleugh, Byron B, Peterson, Vanelle F, (2009) Aminopyralid and clopyralid absorption and translocation in Canada thistle (Cirsium arvense) Weed Science 57 1 10-15

(2009) Are herbicide-resistant crops the answer to controlling Cuscuta? Pest Manag Sci 65 811-816

(2009) Inheritance of Resistance to the Auxinic Herbicide Dicamba in Kochia (Kochia scoparia) Weed Sci 57 43-47

(2009) Registration of 'Thunder CL' Wheat J Plant Regist 3 181-184

(2009) The Effects of Surfactants, Nozzle Types, Spray Volumes, and Simulated Rain on 1-Methylcyclopropene Efficacy on Tomato Plants Hortscience 44 1600-1603

Byrne, Patrick F, Gaines, Todd, Westra, Philip, Henry, W B, Nissen, Scott J, Chapman, P, Harrington, Judith Eileen, (2008) "Estimating gene flow from wheat to wheat and wheat to jointed goatgrass (Aegilops cylindrica)" CSU Agricultural Experiment Station TB08-03

(2008) Herbicide-resistance in the Amaranthaceae J Plant Dis Protect 48 41-44

(2008) Jointed goatgrass (Aegilops cylindrica) by imidazolinone-resistant wheat hybridization under field conditions Weed Sci 56 32-36

Gaines, Todd, Brien Henry, W, Byrne, Patrick F, Westra, Philip, Nissen, Scott J, Shaner, Dale L, (2008) Jointed goatgrass (Aegilops cylindrica) by imidazolinone-resistant wheat hybridization under field conditions Weed Science 56 1 32–36

(2008) Spatial Variability of Atrazine and Metolachlor Dissipation on Dryland No-tillage Crop Fields in Colorado J Environ Qual 37 2212-2220

(2008) Weed population dynamics after six years under glyphosate- and conventional herbicide-based weed control strategies Crop Sci 48 1170-1177

Westra, Philip, Wilson, Robert G, Miller, Stephen D, Stahlman, Phillip W, Wicks, Gail W, Chapman, Phillip L, Withrow, John, Legg, David, Alford, Craig, Gaines, Todd, (2008) Weed population dynamics after six years under glyphosate-and conventional herbicide-based weed control strategies Crop Science 48 3 1170-1177

(2007) Adventitious presence of herbicide resistant wheat in certified and farm-saved seed lots Crop Sci 47 751-756

Gaines, Todd, Preston, Christopher, Byrne, Patrick F, Henry, W Brien, Westra, Philip, (2007) Adventitious presence of herbicide resistant wheat in certified and farm-saved seed lots Crop Science 47 2 751–754

(2007) An empirically derived model of field-scale gene flow in winter wheat Crop Sci 47 2308-2316

Gaines, Todd, Byrne, Patrick F, Westra, Philip, Nissen, Scott J, Henry, W Brien, Shaner, Dale L, Chapman, Phillip Lee, (2007) An empirically derived model of field-scale gene flow in winter wheat Crop Science 47 6 2308–2316

(2007) Canada thistle (Cirsium arvense) control with aminopyralid in range, pasture, and noncrop areas Weed Technol 21 890-894

(2007) Glyphosate susceptibility in common lambsquarters (Chenopodium album) is influenced by parental exposure Weed Sci 55 572-577

(2007) Recovery of imidazolinone-resistant hard red wheat lines following imazamox application Crop Sci 47 2058-2066

(2006) AMADS increases the efficacy of glyphosate formulations on corn Weed Technol 20 179-183

(2006) Comparison of efficacy, absorption and translocation of three glyphosate formulations on velvetleaf (Abutilon theophrasti) Pest Manag Sci 62 1177-1181

(2006) Ethylene effect on kochia (Kochia scoparia) and emission following dicamba application Weed Sci 54 31-37

(2006) Registration of 'Bond CL' wheat Crop Sci 46 993-995

(2006) Registration of 'protection' wheat Crop Sci 46 995-996

(2006) Response of selected hard red wheat lines to Imazamox as affected by number and location of resistance genes, parental background, and growth habit Crop Sci 46 1206-1211

(2006) Soil dissipation and biological activity of metolachlor and S-metolachlor in five soils Pest Manag Sci 62 617-623

(2005) New techniques and findings in the study of a candidate allelochemical implicated in invasion success Ecol Lett 8 1039-1047

(2004) Combined effects of herbicides and Sphenoptera jugoslavica on diffuse knapweed (Centaurea diffusa) population dynamics Weed Sci 52 418-423

(2004) Common lambsquarters (Chenopodium album) interference with corn across the northcentral United States Weed Sci 52 1034-1038

(2003) Above winter wheat Can J Plant Sci 83 107-108

(2003) AP502 CL winter wheat Can J Plant Sci 83 109-110

(2003) Genetic diversity of jointed goatgrass (Aegilops cylindrica) determined with RAPD and AFLP markers Weed Sci 51 287-293

(2002) Infestation and spatial dependence of weed seedling and mature weed populations in corn Weed Sci 50 54-63

Heermann, DF, Hoeting, Jennifer A, Thompson, SE, Duke, HR, Westfall, DG, Buchleiter, GW, Westra, Philip, Peairs, FB, Fleming, Kevin Casey, (2002) Interdisciplinary irrigated precision farming research Precision agriculture 3 1 47–61

(2002) The potential for mapping nematode distributions for site-specific management J Nematol 34 80-87

(2001) Absorption and fate of BAY MKH 6561 in jointed goatgrass and downy brome Weed Sci 49 717-722

(2001) Absorption, translocation, and metabolism of imazamox in jointed goatgrass and feral rye Weed Sci 49 607-612

(2001) Evaluation of models predicting winter wheat yield as a function of winter wheat and jointed goatgrass densities Weed Sci 49 48-60

Heermann, DF, Hoeting, Jennifer A, Duke, HR, Westfall, DG, Buchleiter, GW, Westra, Philip, Peairs, FB, Fleming, Kevin Casey, (2000) "Irrigated precision farming for corn production" 10–12

(2000) Secale cereale interference and economic thresholds in winter Triticum aestivum Weed Sci 48 720-727

(2000) The seedbank dynamics of feral rye (Secale cereale) Weed Technol 14 14-Jul

(1999) A plant process economic model for weed management decisions in irrigated onion J Am Soc Hortic Sci 124 99-105

(1999) Absorption, fate, and soil activity of quinclorac in field bindweed (Convolvulus arvensis) Weed Sci 47 136-142

(1999) Precision farming Weed Sci 48 1777-1783

(1999) Site-to-site and year-to-year variation in Triticum aestivum-Aegilops cylindrica interference relationships Weed Sci 47 529-537

(1999) Sorption, dissipation, and leaching of metsulfuron in Colorado soils Weed Sci 47 353-359

(1999) Spatial sampling for crop pests in two center pivot irrigated fields Weed Sci 48 511-522

(1999) Stability of corn (Zea mays)-foxtail (Setaria spp) interference relationships Weed Sci 47 195-200

(1999) The influence of surfactant and nitrogen on foliar absorption of MON 37500 Weed Sci 47 270-274

(1999) Use of quinclorac plus 2,4-D for controlling field bindweed (Convolvulus arvensis) in fallow Weed Technol 13 731-736

(1998) Comparative growth and development of four spurred anoda (Anoda cristata) accessions Weed Sci 46 91-98

(1998) Impact of timing and frequency of in-row cultivation for weed control in dry bean (Phaseolus vulgaris) Weed Technol 12 548-553

(1998) Seedbank and emerged annual weed populations in cornfields (Zea mays) in Colorado Weed Technol 12 243-247

(1998) The response of dodder (Cuscuta spp) seedlings to phytohormones under various light regimes Ann Appl Biol 132 331-338

(1997) Control of sulfonylurea-resistant kochia (Kochia scoparia) Weed Technol 11 270-276

(1997) Economics and efficacy of postemergence spurred anoda (Anoda cristata) control in pinto beans (Phaseolus vulgaris) Weed Technol 11 329-334

(1997) Effects of light and mechanical stimulation on coiling and prehaustoria formation in Cuscuta spp Weed Res 37 219-228

(1997) Growth analysis of sulfonylurea-resistant and -susceptible kochia (Kochia scoparia) Weed Sci 45 691-695

(1997) The competitive ability of wheat (Triticum aestivum) compared to rigid ryegrass (Lolium rigidum) and cowcockle (Vaccaria hispanica) Weed Sci 45 481-487

(1996) A new approach to determine when to control weeds Weed Sci 44 496-503

(1996) Integrated weed management systems for irrigated corn (Zea mays) production in Colorado - A case study Weed Sci 44 423-428

(1996) Modelling the effect of duration of weed competition, weed density and weed competitiveness on seeded, irrigated onion Weed Res 36 259-269

(1996) Stability of corn (Zea mays) velvetleaf (Abutilon theophrasti) interference relationships Weed Sci 44 309-313

(1996) Venice mallow (Hibiscus trionum) seed production and persistence in soil in Colorado Weed Technol 10 22-28

(1995) Influence of Weed Density and Distribution on Corn (Zea-Mays) Yield Weed Sci 43 215-218

(1995) The Concept and Application of Early Economic Period Threshold - the Case of Dcpa in Onions (Allium-Cepa) Weed Sci 43 634-639

(1995) Weed-Control Efficacy and Pinto Bean (Phaseolus-Vulgaris) Tolerance to Early-Season Mechanical Weeding Weed Technol 9 531-534

(1994) A Plant Process-Economic Model for Wild Oats Management Decisions in Irrigated Barley Agr Syst 45 355-368

(1994) Controlling Weeds in Corn (Zea-Mays) Rows with an in-Row Cultivator Versus Decisions Made by a Computer-Model Weed Sci 42 593-600

(1992) Field Bindweed (Convolvulus-Arvensis) Control with Various Herbicide Combinations Weed Technol 6 949-955

(1992) Reducing Herbicide Loading in Corn with Weed Management Models Abstr Pap Am Chem S 203 310-ENVR

(1991) Wild Proso Millet (Panicum-Miliaceum) Interference in Corn (Zea-Mays) Weed Sci 39 217-220

(1990) Control of Venice Mallow (Hibiscus-Trionum) in Corn (Zea-Mays) and Onions (Allium-Cepa) Weed Technol 4 500-504

(1990) Wild-Proso Millet - Proceedings of a Symposium of the Weed-Science-Society-of-America February 9, 1989, Dallas, Texas Weed Technol 4 407-408