College of Agricultural, Human, and Natural Resource Sciences

Dept. of Crop and Soil Sciences

Dr. Ian Christofer Burke

Ian Burke

Associate Professor / Scientist

163 Johnson Hall
PO Box 646420
Pullman WA 99164-6420 USA
Phone 509-335-2858
FAX 509-335-8674


Ph.D., Weed Science, North Carolina State University.  December 2005.
Dissertation:  Biology, physiology, and pollen expression of ACCase resistance in johnsongrass (Sorghum halepense).

Master of Science, Weed Science, North Carolina State University.  May 2002.
Thesis:  Influence of environmental factors on broadleaf signalgrass (Brachiaria platyphylla) and crowfootgrass (Dactyloctenium aegyptium) and antagonism of clethodim by CGA 362622 and imazapic.

Bachelor of Science, Biology, Old Dominion University.  May 1997.

Curriculum Vitae (pdf)

Research Experience

  • Associate Professor, Washington State University, 7/12 – Present
  • Assistant Professor, Washington State University, 7/06 –7/12.
  • Post-Doctoral Research Associate and Plant Physiologist, USDA-ARS Southern Weed Science Research Unit, 9/05-9/06.
  • Graduate Research Assistant, North Carolina State University, 7/99 – 8/05.


  • 2011

*†Bell, J.A., I.C. Burke, and T. Prather. 2011. Uptake, translocation and metabolism of aminocyclopyrachlor in prickly lettuce, yellow starthistle, and rush skeletonweed. Pest Manage. Sci.67:1338-1348.

*†Riar, D.S., I.C. Burke, J.P. Yenish, and K. Gill. 2011. Physiological and genetic basis for 2,4-D resistance in prickly lettuce (Lactuca serriola). J. Agric. Food Chem. 59:9417-9423.

*†Smitchger, J., I.C. Burke, and J.P. Yenish. 2011. The critical period of weed control in chickpea. Weed Sci. DOI 10.1614/WS-D-11-00069.1.

*†Riar, D.S., S. Rustgi, I.C. Burke, K.S. Gill, and J.P. Yenish. 2011. EST-SSR development from 5 Lactuca species and their use in studying genetic diversity among L. serriola biotypes. J. Hered. 102:17-28.

†Felix, J., R. Boydston, and I.C. Burke. 2011. Potato (Solanum tuberosum) response to simulated glyphosate drift. Weed Technol. 25:637-644.

*†Walsh, D.T., E.M. Babiker, I.C. Burke, and S.H. Hulbert. 2011. Camelina mutants resistant to acetolactate synthase inhibitor herbicides. Mol. Breeding DOI 10.1007/s11032-011-9689-0.

†Riar, D.S., J.P. Yenish, D. Ball, and I.C. Burke. 2011. Efficacy of postemergence herbicides with a reduced herbicide applicator in fallow. Weed Technol. 25:447-453.

†Lee, H., S. Rustgi, N. Kumar, I.C. Burke, J. P. Yenish, K. Gill, D. Von Wettstein, and S. Ulrich. 2011. A single point mutation in the barley acetohydroxy acid synthase (HvAHAS) gene confers resistance to imidazalinone herbicides. PNAS 108:11983-11988.

Krutz, L.J., M.A. Locke, R.W. Steinriede, Jr., K. Reddy, L. Libious-Bailey, and I.C. Burke. 2011. Sediment and non-polar, postemergence pesticide transport differences between wide- and narrow row cotton production systems. J. Soil Water Conserv. (In Press).

†Borrelli, K., R. Koenig, R. Gallagher, D. Pittman, A. Snyder, E.P. Fuerst, I.C. Burke, and L. Hoagland. 2011. Alternative Strategies for Transitioning to Organic Production in Direct-Seeded Grain Systems in Eastern Washington II: Nitrogen Fertility. J. Sustain. Agr. (In Press).

  •  2010

†Gallagher, R.S., D. Pittmann, A.M. Snyder, R.T. Koenig, E.P. Fuerst, I.C. Burke and L. Hoagland. 2010. Alternative strategies for transitioning to organic production in direct-seeded grain systems in Eastern Washington I: Crop Agronomy. J. Sustain. Agr. 34:483-503.

  • 2009

*†Burke, I.C., J.P. Yenish, D. Pittmann, and R.S. Gallagher. 2009. Resistance of a prickly lettuce biotype to 2,4-D. Weed Technol. 23:586-591.

*Burke, I.C., K.N. Reddy, and C.T. Bryson. 2009. Pitted and hybrid morningglory accessions have variable tolerance to glyphosate. Weed Technol. 23:592-598.

*Krutz, L.J., I.C. Burke, K.N. Reddy, R.M. Zablotowicz, and A.J. Price. 2009. Enhanced atrazine degradation: evidence for reduce residual weed control and a method for identifying adapted soils and predicting herbicide persistence. Weed Sci. 57:427-434.

Reddy, K.N., I.C. Burke, J.C. Boykin, and J.R. Williford. 2009. Narrow-row cotton production under irrigated and non-irrigated environments: plant population and lint yield. J. Cotton Sci. 13:48-55.

More publications  (pdf)

Honors and Awards

  • Excellence in Research, College of Agriculture, Human, and Natural Resources
  • Outstanding Weed Scientist – Early Career, Western Society of Weed Science.
  • Outstanding Ph.D. Graduate Student Award, Southern Weed Science Society.
  • Outstanding Ph.D. Graduate Student, Weed Science Society of North Carolina.
  • Outstanding Graduate Student Award, Weed Science Society of America.

Graduate Students


  • Jared Bell (Co-Advised with Dr. Michael Neff). August 2008 – present. Latex and rubber quality and quantity in prickly lettuce. Washington State Univ. Molecular Plant Sciences Program.
  • Shawn Wetterau (Co-Advised with Dr. William Pan). June 2010 – present. Genetic and physiological aspects of artemisinin production in Artemisia annua grown Eastern Washington. Dep. of Crop and Soil Sciences.
  • Attawan Surachet (Co-Advised by Dr. Camille Steber). August 2010 – present. Mechanism of resistance to glyphosate in mutated spring wheat. Dep. Crop and Soil Sciences.
  • Rachel Unger. June 2010 to present. Field-scale evaluation of key economic, weed, disease, soil C and N properties in long-term, dryland conservation cropping systems of the Pacific Northwest. Dep. of Crop and Soil Sciences.
  • Nevin Lawrence. June 2011 to present. Downy brome biology and ecology in response to climate change. Dep. of Crop and Soil Sciences.
  • Kristy Ott-Borelli (Co-Advised with Dr. Richard Koenig). August 2009 – May 2012. Nitrogen balance and alternate sources for dryland organic production. Dep. Crop and Soil Sciences.


  • Alan Raeder. May 2011 – Present. Sorption and persistence of pyroxsulam in Pacific Northwest cereal soils. Dep. of Crop and Soil Sciences.
  • Misha Manuchehri. May 2010 – August 2012. Relative competitiveness of spring crops for dryland organic systems. Dep. of Crop and Soil Sciences.


My research program at Washington State University is focused on basic aspects of weed biology and ecology with the goal of integrating such information into practical and economical methods of managing weeds in the environment. Currently, ongoing projects include physiological, biological and ecological studies on prickly lettuce, a common and troublesome weed in crops, range, and noncropland throughout the inland Pacific Northwest. Prickly lettuce is an invasive weed with wind dispersed seeds that crosses boundaries at multiple scales – from field borders to regional boundaries. It infests Conservation Reserve Program (CRP) land and appears to cause significant economic losses in wheat-based cropping systems. Future research will focus on improving understanding of the biology of this species and the implications of control inputs in different adjacent managed ecosystems (wheat and CRP). This project will test the hypothesis that weed control practices resulting from policy directed economic limitations in CRP will have a direct effect on production practices and profitability in adjacent agroecosystems. Those same control practices may have also have contributed to the development of herbicide resistance. To test this hypothesis, the effects of policy-induced prickly lettuce control practices in CRP on fecundity in response to typical (low) input versus effective (high) input, seed movement and seed rain dynamics to adjacent crop ground that result from those inputs, and density-dependent yield losses (and thus the economic costs) based on seed production in crops and seed movement out of CRP and into adjacent crop fields. This information would allow more accurate guidance for policy makers and growers on how to manage this destructive weed for the benefit of both ecosystems.

Other projects include an assessment of the changes in the soil seed bank in response to 8 years of crop rotation at the Cook Agronomy Farm, biological and physiological aspects ofArtemisia annua cultivation in eastern Washington, and physiological and biochemical investigations with aminocyclopyrachlor, a new growth regulator type herbicide.

Dept. of Crop and Soil Sciences, PO Box 646420, Washington State University, Pullman WA 99164-6420, 509-335-3475, Contact Us
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