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Drew Lyon

Drew Lyon

Endowed Chair Small Grains Extension and Research, Weed Science

169 Johnson Hall
PO Box 646420
Pullman, WA 99164-6420 USA
Phone 509-335-2961
FAX 509-335-8674

Curriculum vitae (pdf)


Ph.D.,  Agronomy/Weed Science, University of Nebraska-Lincoln. August 1988
Dissertation: A search for metribuzin tolerance in fieldbeans (Phaseolus vulgaris).

M.S., Agronomy/Weed Science, University of Nebraska-Lincoln. December 1985
Thesis: Response of fieldbeans (Phaseolus vulgaris) to reduced rates of 2,4-D and dicamba.

B.S., Agronomy/Crop Protection, University of Illinois at Urbana-Champaign. August 1980


My Extension and Research Program focuses on integrated weed management in dryland small grain production in eastern Washington. I will focus on the troublesome weeds in each of the three rainfall zones of eastern Washington, i.e., low, medium, and high. This will include the winter annual grass weeds such as downy brome (Bromus tectorum), jointed goatgrass (Aegilops cylindrica), feral rye (Secale cereale), Italian ryegrass (Lolium multiflorum), and rattail fescue (Vulpia myuros); as well as some of the troublesome warm-season broadleaf weeds in small grains and/or fallow such as mayweed chamomile (Anthemis cotula), Russian-thistle (Salsola tragus), prickly lettuce (Lactuca serriola), rush skeletonweed (Chondrilla juncea), and smooth scouringrush (Equisetum laevigatum). The use of herbicides in conjunction with cultural practices such as crop rotation, plant population, row spacing, and fertility will be investigated as will the use tillage, when necessary. Herbicide-resistant weeds are a major concern in the region and integrated weed management strategies must be devised to deal with existing herbicide resistance issues and slow the development of new herbicide-resistant biotypes. As part of my Extension appointment, I provide leadership for the WSU Extension Dryland Cropping Systems Team. One of our major projects has been the development of the Wheat and Small Grains Website, where growers and consultants can find all the information and decision tools that WSU Extension has related to wheat and small grains production and marketing.

Associates in Research

Mark Thorne
Henry Wetzel

Recent Publications

Lyon, D.J., M.E. Thorne, P. Jha, V. Kumar, and T. Waters. 2019. Volunteer buckwheat control in wheat. Crop Forage Turfgrass Manage. doi:10.2134/cftm2019.05.0033.

Barroso, J., D.J. Lyon, and T. Prather. 2019. Russian thistle management in a wheat-fallow crop rotation. (PNW492).

Lyon, D.J, M.E. Swanson, F.L. Young, and T. Coffey. 2018. Jointed goatgrass biomass and spikelet production increases in no-till winter wheat. Crop Forage Turfgrass Manage. doi:10.2134/cftm2018.04.0031.

Mallory-Smith, C., A.R. Kniss, D.J. Lyon, and R.S. Zemetra. 2018. Jointed goatgrass (Aegilops cylindrica): A review. Weed Sci. 66:562-573.

Walsh, M.J., J.C. Broster, L.M. Schwartz-Lazaro, J.K. Norsworthy, A.S. Davis, B.D. Tidemann, H.J. Beckie, D.J. Lyon, N. Soni, P. Neve, and M.V. Bagavathiannan. 2018. Opportunities and challenges for harvest weed seed control in global cropping systems. Pest Manag. Sci. 74:2235-2245.

San Martín, C., D.J. Lyon, J. Gourlie, H.C. Wetzel, and J. Barroso. 2018. Weed control with bicyclopyrone + bromoxynil in wheat. Crop Forage Turfgrass Manage. 4:180011. doi:10.2134/cftm2018.02.0011.

Spring, J.F., M.E. Thorne, I.C. Burke, and D.J. Lyon. 2018. Rush skeletonweed (Chondrilla juncea) control in Pacific Northwest winter wheat. Weed Technol. 32:360-363.

Hauvermale, A.L., K.N. Race, N.C. Lawrence, L. Koby, D.J. Lyon, and I.C. Burke. 2018. A mayweed chamomile growing degree day model for the Inland Pacific Northwest. (FS306E).

Lyon, D.J., D.A. Ball, and A.G. Hulting. 2018. Rattail fescue: Biology and management in Pacific Northwest wheat cropping systems. (PNW613).

Lyon, D.J., I.C. Burke, and J.M. Campbell. 2018. Integrated management of mustard species in wheat production systems. (PNW703).

Kumar, V., J.F. Spring, P. Jha*, D.J. Lyon, and I.C. Burke. 2017. Glyphosate-resistant Russian-thistle (Salsola tragus) identified in Montana and Washington. Weed Technol. 31:238-251.

Lyon, D.J., I.C. Burke, A.G. Hulting, and J.M. Campbell. 2017. Integrated management of mayweed chamomile in wheat and pulse production systems. (PNW695).

Nielsen, D.C., D.J. Lyon, and J.J. Miceli-Garcia. 2017. Replacing fallow with forage triticale in a dryland wheat-corn-fallow rotation may increase profitability. Field Crops Res. 203:227-237.

Hansen, N.C., B.L. Allen, S. Anapalli, R.E. Blackshaw, D.J. Lyon, and S. Machado. 2017. Dryland agriculture in North America. In: Farooq, M. and Siddique K.H.M.  (eds). Innovations in dryland agriculture. Cham, Springer, pp. 415-441.

Calderon, F.J., D. Nielsen, V. Acosta-Martinez, M. Vigil, and D. Lyon. 2016. Cover crop and irrigation effects on soil microbial communities and enzymes in semiarid agroecosystems of the Central Great Plains of North America. Pedosphere: 26:192-205.

Hurisso, T.T., U. Norton, J.B. Norton, J. Odhiambo, S. J. Del Grosso, G.W. Hergert, and D.J. Lyon. 2016. Dryland soil greenhouse gases and yield-scaled emissions in no-till and organic winter wheat-fallow systems. Soil Sci. Soc. Am. J. 80:178-192.

Nielsen, D.C., D.J. Lyon, R.K. Higgins, G.W. Hergert, J.D. Holman, and M.F. Vigil. 2016. Cover crop effect on subsequent wheat yield in the Central Great Plains. Agron. J. 108:243-256.

Lyon, D.J., D.R. Huggins, and J.F. Spring. 2016. Windrow burning eliminates Italian ryegrass (Lolium perenne ssp. multiflorum) seed viability. Weed Technol. 30:279-283.

Lyon, D.J., and I.C. Burke. 2016. Integrated management of prickly lettuce in wheat production systems. (PNW688).

Raeder, A.J., D.J. Lyon, J.B. Harsh, and I.C Burke. 2015. How soil pH affects the activity and persistence of herbicides. (FS189E).

Nielsen, D.C., D.J. Lyon, G.W. Hergert, R.K. Higgins, and J.D. Holman. 2015. Cover crop biomass production and water use in the Central Great Plains. Agron. J. 107:2047-2058.

Lyon, D.J., and F.L. Young. 2015. Integration of weed management and tillage practices in spring barley production. Weed Technol. 29:367-373.

Nielsen, D.C., D.J. Lyon, G.W. Hergert, R.K. Higgins, F.J. Calderon, and M.F. Vigil. 2015. Cover crop mixtures do not use water differently than single-species plantings. Agron. J. 107:1025-1038.

Lyon, D.J., A.G. Hulting, D.W. Morishita, and F.L. Young. 2015. Integrated management of downy brome in winter wheat. (PNW668).





Timely Topics

Herbicide Resistance Trends

I just finished reading a journal article by Hugh Beckie, Michael Ashworth, and Ken Flower, all of whom are with the Australian Herbicide Resistance Initiative at the University of Western Australia. Herbicide Resistance Management: Recent Developments and Trends (pdf) provides a nice summary of how the Australian approach towards managing herbicide resistance in weeds has changed and how it continues to evolve. Australia has been on the forefront of herbicide resistance management for many years now because they developed some of the worst weed resistance issues in the world.


Updated PNW Extension Publication on Managing Russian Thistle in a Wheat-Fallow Crop Rotation

The regional Extension publication, PNW492: Russian Thistle Management in a Wheat-Fallow Crop Rotation was updated recently to reflect the latest research on the biology and management of Russian thistle in the inland Pacific Northwest. The first known introduction of Russian thistle to North America was near Scotland, South Dakota in 1873 or 1874. By 1910 it was widely distributed across the arid and semi-arid regions of the American west, an estimated 101 million acres. It is the most economically important summer-annual broadleaf weed found in the low-precipitation zone of the inland Pacific Northwest.


Smooth Scouringrush Research

Shortly after arriving at WSU in the fall of 2012, a farmer near Rearden took me for a drive to show me numerous no-till fields infested with smooth scouringrush (Equisetum laevigatum).  Smooth scouringrush is a member of a prehistoric group of plants whose ancient relatives date back approximately 350 million years, nearly 200 million years before the appearance of modern flowering plants, and 300 million years before the evolution of grass plants. It is native to North America and is often found near streams and along roads where water collects.  Plants are deep-rooted and spread mainly by rhizomes (underground stems), but they also produce asexual spores. Stems are leafless and contain a high concentration of silica. Fertile stems have a spore-producing structure at the tip.

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