Conservation and utilization of agrobiodiversity in general, with specific attention towards the biogeography and domestication of agricultural species. Special interests include African crop species as well as species used for fragrance and perfume.

- Investigating food deserts in urban systems as well as levels of agrobiodiversity in the urban food market.

- Genetic characterization of chestnut species to aid restoration of American chestnut throughout its native range.

- Analyzing how crop yields are impacted by centers of origin and biogeography as well as biotic constraints.

- Looking at centers of origin and domestication of the most economically important species used in the fragrance industry.

L.R. Lewis & K.J. Chambers. 2010. Geographic Contributions to Agrobiodiversity Conservation. The Professional Geographer. 62 (3): 303-304.

L.R. Lewis. 2010. Range dynamics and their implications for pearl millet populations in Sahelian Africa. The Professional Geographer. 62 (3): 377-394.

L.R. Lewis. 2010. Editor: B. Warf. The Encyclopedia of Geography. Entry: The geography of plant and animal domestication. Sage Publications.

Hansen, J.D., L.R. Lewis & S.R. Drake. 2005.  Trap catches of codling moth in commercial Washington sweet cherry orchards.  Journal of Tree Fruit Production.  3: 33-43.

Hansen, J.D. & L.R. Lewis. 2003. Field survival of codling moth (Lepidoptera: Tortricidae) on artificially infested sweet cherries.  Crop Protection. 22 (5): 721-727.

Hansen, J.D., Lewis, L.R. & G. F. Simmons. 2003. Arthropods present on removed foliage from an apple packing line.  Southwest Entomologist.  28: 205-210.

Hansen, J.D., Rehmke, L.J. & G.F. Simmons. 2003. Packinghouse survey of Washington cherries for surface arthropods. Journal of the Kansas Entomological Society. 76 (1): 76-78.

Landolt, P.J., Wixson, T., Rehmke, L.J., Lewis, R.R. & R.S. Zack.  Methyl anthranilate attracts males of Thaumatomyia glabra (Meigen) (Diptera: Chloropidae). 2000. Journal of the Kansas Entomological Society. 73: 189-194.

Lewis, L.R. 2009. Agrobiodiversity in the urban landscape: reflections of the African Diaspora in local California food markets. Paper for: Society for Economic Botany (SEB) annual meeting. May 31st-June 5th. Charleston, SC.

Lewis, L.R., Brush, S.B., Grote, M.N. & E.T. Kiers. 2009. Predicting factors that impact productivity within and outside centers of crop origin. Paper for: Association of American Geographers (AAG) annual meeting. March 22-28th. Las Vegas, NV.

Lewis, L.R. 2008. Range dynamics and their implications for pearl millet populations in Sahelian Africa. Paper for: Association of American Geographers (AAG) annual meeting. April 14-19th. Boston, MA.

Lewis, L.R. 2007. Morphological and molecular diversity of wild, intermediate, and domesticated pearl millet. Paper for: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America annual meeting. Div. C-8 – Plant Genetic Resources. November 4 – 8th. New Orleans, LA.

Lewis, L.R. 2006.  Biogeography and genetic diversity of pearl millet (Pennisetum glaucum) from Africa.  Association of American Geographers, Annual Meeting.  March 7 – 11.  Chicago, Illinois.

Lewis, L.R., Brush, S.B. & P.L. Gepts.  2004.  Regional biogeography and local farmer management of pearl millet and their impact on genetic diversity.  Invited Speaker for: American Society of Agronomy, 96th Annual Meeting. Div. C-8 – Plant Genetic Resources: Symposium - Landraces: Infra-specific Diversity and Adaptive Divergence on an Endangered Evolutionary Link: I. October 31 – November 4. Seattle, Washington.

Lewis, L.R. 2004. Germplasm management of pearl millet (Pennisetum glaucum) by Hausa and Fulani in Niger, West Africa.  Society of Ethnobiology 27th Annual Conference.  March 24-27.  Davis, California.

Lewis, L.R. 2003.  Regional biogeography and local farmer management of pearl millet (Pennisetum glaucum) and their impact on genetic diversity.  Fall Seminar Series for the International Agricultural Development Program.  University of California, Davis.
 
Rehmke, L.J. 1999.  A Peace Corps volunteer’s perspective of sustainable agriculture in Niger, West Africa.  Washington State University Speaker Series at the USDA, ARS Yakima Area Research Laboratory, Wapato, Washington.

Rehmke, L.J., M.L. Heidt, D.J. Albano, M.A. Watkins, G.F. Simmons, and J.D. Hansen. 1998. 1998 survey of Washington packing house cherries for quarantine arthropods.  Abstracts Proc. Wash. St. Hort. Assoc.  94: 224.

Physical Geography, Biogeography, Advanced Seminar in Biogeography, and Research Methods for Geography and Environmental Systems