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Washington State University Molecular Plant Sciences


Associate Professor/Scientist, Department of Crop and Soil Sciences, Ph.D. 2005, North Carolina State University









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

Selected Publications


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.

Riar, D. S., S. Rustgi, I. C. Burke, K. S. Gill, and J. P. Yenish. 2010. Genetic diversity and relationships among prickly lettuce biotypes from the Pacific Northwest and cultivated relatives as revealed by EST-SSR analysis. J. Heredity (Accepted).

Riar, D. S., J. P. Yenish, D. Ball, and I. C. Burke. 2010. Efficacy of postemergence herbicides with a reduced herbicide applicator in fallow. Weed Technol. 24 (Accepted).

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).

Burke, I. C., S. C. Troxler, J. W. Wilcut, and W. D. Smith.  2008.  Purple and yellow nutsedge (Cyperus rotundus L. and C. esculentus L.) response to postemergence herbicides in cotton (Gossypium hirsutumL.).  Weed Technol. 22:615-621.

Burke, I. C., W. E. Thomas, J. Allen, J. Collings, and J. W. Wilcut.  2008.  A comparison of weed control in herbicide-resistant, herbicide-tolerant, and conventional corn (Zea mays).  Weed Technol. 22:571-579.
Krutz, L. J., I. C. Burke, K. N. Reddy, and R. M. Zablotowicz.  2008.  Evidence for cross-adaptation between s-triazine herbicides resulting in reduced efficacy under field conditions.  Pest. Manage. Sci. 64:1024-1030.

Burke, I. C., C. H. Koger, K. N. Reddy, and J. W. Wilcut.  2007.  Reduced translocation is the cause of antagonism of glyphosate by MSMA in browntop millet (Brachiaria ramose) and Palmer amaranth (Amaranthus palmerii).  Weed Technol. 21:166-170.

Burke, I. C., J. B. Holland, J. D. Burton, A. C. York, and J. W. Wilcut.  2007.  Johnsongrass (Sorghum halepense) pollen expresses ACCase target site resistance.  Weed Technol. 21:384-388.

Burke, I. C., J. W. Wilcut, and N. S. Allen.  2007.  Viability and in vitro germination of johnsongrass pollen (Sorghum halepense) pollen.  Weed Technol. 21:23-29.