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United States Department of Agriculture

Agricultural Research Service

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Enhanced Disease Resistance and Improved Management Strategies for root rot diseases of peas, chickpeas, lentils and other edible legumes.







 Brigham Young University


 Conservation Biology


Brigham Young University




Washington State University


Plant Pathology



Current Position

Research Plant Pathologist with the United States Department of Agriculture, Agricultural Research Service (Rank = GS-13.5, Category 1 Scientist).  Duties involve laboratory, greenhouse and field research to develop integrated pest management strategies to control potato, pea, alfalfa, bean, chickpea and lentil diseases.  I do work with both foliar and root rotting pathogens on these crops.   


Professional Experience

·      2005-Present: Research Plant Pathologist (GS 13.5), USDA-ARS, Prosser, WA       

·      2003-2005: Post-doctoral Fellow, University of Idaho (Potato Pathology), Aberdeen, ID

·      2005: Business Consultant, Driscoll Potatoes Inc., American Falls, ID

·      1999-2003: Research/Teaching Assistant, Washington State University, Pullman, WA

·      1998-1999: Adjunct Professor, Utah Valley State College, Orem, UT

·      1996-1999: Research/Teaching Assistant, Brigham Young University, Provo, UT

·      1994: Research Assistant, National Cancer Institute, Bethesda, MD

·      1994: Laboratory Technician, U.S.D.A. Shrub Science Laboratory, Provo, UT


Honors and Awards

·   2012: Washington State University, College of Agricultural, Human, and Natural

Resource Science, Team Interdisciplinary Award.   This award is given to a group of

faculty, staff, and/or students who have made significant contributions through an

application of interdisciplinary scholarship in research, teaching, and/or extension. Given

for my work associated with the Pacific Northwest Vegetable Extension Group, an

interdisciplinary team associated with solving homeowner and commercial growers needs

in all aspects of agricultural extension.Pullman, WA, April, 2012 (Group).         

·   2009: Early Career Award, Pacific Division of the American Phytopathological     


·   2008: Selected by the Early Career Professionals Committee, the Scientific Programs Board and the Mycology Committee of the American Phytopathological Society as a Face of the Future in Mycology, awarded to forward thinkers and perceived future leaders in the field of Mycology, $700 honorarium, APS Annual Meeting, Minneapolis, MN.

·   2007: President of the Pacific Division of the American Phytopathological Society. 

·   2005: Presentation on management of potato pink rot given at the Horticulture Grower’s Short Course sponsored by the Lower Mainland Horticultural Improvement Association, Abbotsford, BC, Canada, honorarium $500.

·   1999-2003: Research/Teaching Assistantship, Washington State University.

·   2001-2002: Julia Greenwell Graduate Scholarship, Washington State University.


Honors and Awards cont.

2001: Member of the Pacific Division De Bary Bowl Team (Knowledge Bowl in Plant Pathology) that won first place at the Annual Meeting of the American Phytopathological Society, $100, Salt Lake City, UT.

2001: John F. Fulkerson Travel Award to attend the APS Annual Meeting in Salt Lake City, UT, APS Foundation Competitive Award, $400.

  2000: First place in Student Paper Competition, $200, American Phytopathological Society, Pacific Division Meeting in Victoria, BC, Canada.

  2000: Teaching Assistant Excellence Award, $300.  Awarded by the Graduate and Professional Student Association at Washington State University to 10 of 94 nominated graduate and professional students across the university involved in teaching; awarded for my teaching in the Plant Pathology Lab.


Refereed Journal Publications

Porter, L. D. 2011. Pea germplasm with partial resistance to Sclerotinia sclerotiorum that

           extends the time required by the pathogen to infect host tissue. Crop Science In Press.

Porter, L. D. 2011. Selection of pea genotypes with partial resistance to Sclerotinia sclerotiorum

           across a wide range of temperatures and periods of high relative humidity. Euphytica In


Leavitt, S. D., Frankhauser, J. D., Leavitt, D. H., Porter, L. D., Johnson, L. A., and St. Clair, L.

           L. 2011. Complex patterns of speciation in cosmopolitan “rock posy” lichens –

           Discovering and delimiting cryptic fungal species in the lichen-forming Rhizoplaca

           melanophthalma species-complex (Lecanoraceae, Ascomycota). Molecular Phylogenetics

           and Evolution 59:587-602.

Céline, H., Baranger, A, Coyne, C. J., Le Goff, I., L’Anthoëne, V., Esnault, R., Rivière, J., Klein,

            A., Mangin, P., McGee, R. J., McPhee, K. E., Roux-Duparque, M., Porter, L., Miteul,

            H., Lesné, A., Morin, G., Onfroy, C., Moussart, A., Tivoli, B., Delourme, R., Pilet‑Nayel,

            M. 2011. New consistent QTL in pea associated with partial resistance to Aphanomyces

            euteiches in multiple field and controlled condition environments from France and the

            United States. Theoretical and Applied Genetics 123: 261-281.

Linnea, G.S., Harveson, R.M., Chen, W., Dugan, F., Schwartz, H.F., Markell, S.G., Porter, L.,

Burrows, M.L. and Goswami, R. 2011. Ascochyta blight of peas. Online publication. Plant Health Progress doi:10.1094/PHP-2011-0330-01-RS.

Soule, M., Porter, L. , Medina. J.,  Santana, G. P. ,  Blair, M. W., and Miklas, P. N. 2011.

           Comparative QTL map for white mold resistance in common bean, and characterization of

           partial resistance in dry bean lines VA19 and I9365-31. Crop Sci. 51: 123-139

Porter, L.D. 2010. Identification of tolerance to Fusarium root rot in wild pea germplasm with

           high levels of partial resistance. Pisum Genetics 42:1-6.

Larsen, R.C., and Porter, L.D. 2010.  Identification of novel sources of resistance to Pea enation

           mosaic virus in chickpea germplasm. Plant Pathology 59: 42-47.

Vandemark, G. J., and Porter, L.D.  2010. First report of Aphanomyces root rot of lentil caused  

            by Aphanomyces euteiches in Idaho. Plant Disease 94: 480.

Porter, L.D., Hamm, P. B., David, N. L., Gieck, S. L., Miller, J. S., Gundersen, B., and Inglis,

           D. A. 2009. Metalaxyl-M-Resistant Pythium species in potato production areas of the

           Pacific Northwest of the U.S.A.  American Journal of Potato Research 86: 315-326.

Coyne, C.J., McPhee, K.E., Porter, L.D., Grünwald, N.J., and Muehlbauer, F.J.

           2008. Registration of W6 26740, W6 26743 and W6 26746 pea germplasm

           resistant to Fusarium root rot. Journal of Plant Registrations 2:137-139.

Porter, L.D., Hoheisel, G., and Coffman, V.A. 2008. Resistance of peas to Sclerotinia

          sclerotiorum in the Pisum core collection.  Plant Pathology 58: 52-60.  

Riga, E., Porter, L.D., Mojtahedi, H., and Brocke, G. F. 2008.  Pratylenchus neglectus, P.

            thornei, and Paratylenchus hamatus nematodes causing yield reduction to dryland peas

            and lentils in Idaho. Plant Disease 92:979.

Akamatsu, H. O., Grünwald, N. J. Chilvers, M. I., Porter, L. D. and Peevers, L. T. 2007. 

      Development of codominant simple sequence repeat, single nucleotide

      polymorphism and sequence characterized amplified region markers for the pea

         root rot pathogen, Aphanomyces euteiches. Journal of Microbiological Methods 71: 82-86.

Porter, L. D., and Johnson, D. A. 2007.  Survival of sporangia of new clonal lineages of

          Phytophthora infestans in soil under semiarid conditions. Plant Disease 91: 835-


Porter, L. D., Miller, J. S., Nolte, P., and Price, W. J. 2007.  In vitro somatic growth and

          reproduction of phenylamide-resistant and -sensitive isolates of Phytophthora

          erythroseptica from infected potato tubers in Idaho.  Plant Pathology 56: 492-499.

Miller, J.S., Olsen, N., Woodell, L., Porter, L.D., and Clayson, S.  2006.  Post-harvest

         applications of zoxamide and phosphite for control of potato tuber rots caused by

         oomycetes at harvest.  American Journal of Potato Research 83:269-278.

Porter, L. D., Cummings, T. F. and Johnson, D. A. 2006. Effects of soil-applied late

          blight foliar fungicides on infection of potato tubers by Phytophthora infestans.

          Plant Disease 90: 964-968.

Inglis, D. A., Gundersen, B.G., Porter, L. D., Miller, J., Johnson, D. A., Lazoya-

         Saldena, H. and Brown, C. R.  2005. Assessment of Solanum hougasii in

         Washington State and Mexico as a new source of late blight resistance. American

         Journal of Potato Research 83:269-278.

Porter, L. D., Dasgupta, N., and Johnson, D. A. 2005.  Effects of tuber depth and soil

          moisture on infection of potato tubers in soil by Phytopththora infestans. Plant

          Disease 89:146-152.

Porter, L. D., and Johnson, D. A. 2004.  Survival of Phytophthora infestans in surface

          water. Phytopathology 94: 380-387.

Porter, L. D., Inglis, D. A., and Johnson, D. A. 2004.  Identification and characterization

          of resistance to Phytophthora infestans in commercial potato cultivars and

          advanced breeding lines in the Pacific Northwest.  Plant Disease 88: 965-972.


Book Chapters

Johnson, D.A., Hamm, P. B., Miller, J.S., and Porter, L.D. 2011.  Late blight Epidemics in the

            Columbia Basin. 2011 In Press

Miller, J.S., Johnson, D.A., Hamm, P., Inglis, D.A. and Porter, L.D.  2009.

          Managing late blight, pink rot, and Pythium leak in North America. in: Current

          Concepts in Potato Disease Management.  R. Peters, ed. Research Signpost,

          Kerala, India. In press.

Porter, L.D. 2011. Rhizoctonia solani. In: Compendium of Chickpea and Lentil

          Diseases. W. Chen, ed. APS Press, Saint Paul, MN.

Porter, L.D. 2011. Seed Health and Vigor. In: Compendium of Chickpea and

           Lentil Diseases. W. Chen, ed. APS Press, Saint Paul, MN.

Vandemark, G. J., and Porter, L. D.  2011.  Aphanomyces root rot of lentil. In:

            Compendium of Chickpea and Lentil Diseases. W. Chen, ed. APS Press, Saint Paul, MN.


Popular Press Articles

Porter, L. 2011.  Dry pea pathogens that love cool and wet - Aphanomyces root rot). Pulse

            Pipeline 10 (56):2.

Porter, L. 2011.  Dry pea pathogens that love cool and wet - White Mold. Pulse Pipeline 10


Porter, L. 2011.  Dry pea pathogens that love cool and wet - Downy Mildew. Pulse Pipeline 10


Eigenbrode, S., Husebye, D., and Porter, L. 2010. Virus on the Palouse may impact yield. Pulse

            Pipeline 10(4):2.

Porter, L. 2010. 2010 Pulse Crop Disease Update. Pulse Pipeline 9(50):2.

Walsh, D., O’Neal, S., Boydston, R., and Porter. L.  2008. Alfalfa seed row spacing and seed

            spacing study. Western Alfalfa Seed Growers Association Newsletter, Fall 2008. pp.1.

Porter, L. D. 2008. Use of phosphorous acid to manage Aphanomyces root rot. Pulse Pipeline


Porter, L. D., David, N. L., Hamm, P. B., and Inghum, R. E. 2006. Nematode Survey Recently

            Completed in Fresh and Dry Pea Production Regions East of the Cascade Mountains. 

            June issue of the Pacific Northwest Vegetable Extension Group’s Newsletter.

Riga, E., and Porter, L.D. 2006. Nematodes discovered in peas and lentils on the Palouse. Pulse

            Pipeline 7(9):4.

Miller, J., Olsen, N., Clayson, S., Woodell, L. and Porter, L. 2005. Phosphite fungicides: pink

            rot, late blight can be controlled. Potato Grower Vol. 34 (3):34-37.

Porter, L. D. Management of Aphanomyces root rot. 2005. Pulse Pipeline 5:4.

Miller, J., Olsen, N., Woodell, L., Porter, L., and Schneider, A. 2003. Zoxamide studied for post

            harvest use. Potato Grower 32(11): 26-28.

Inglis, D., Gundersen, B., Johnson, D., Porter, L., Brown, C., and Corsini, D. 2002.  Late blight

            test results for A90586-11 continue to look good.  Potato Progress 2(2):1-3.

Johnson, D. A. and Porter, L. 2002.  Managing late blight after row closure to reduce tuber rot. 

            Potato Progress 2(9):1-2.

Johnson, D. A., Porter, L., Cummings, T., Inglis, D., and Hamm,P. 2002. Late blight tuber rot:

            Phostrol, a potential new management tool. Potato Progress 2(7):1-2.

Porter, L., Johnson, D. A., Cummings, T., and Corsini, D. 1999. Tuber resistance/susceptibility

            of new potato cultivars to late blight. Spud Topics 44:2.


Offices and Committee Assignments in Professional and Honorary Societies

Member of the Seed Pathology Committee, American Phytopathological Society, 2010-Present.

Chair (2008) and Past Chair (2009) of the Early Career Professionals Committee, American Phytopathological Society.

Past President, Pacific Division of the American Phytopathological Society, 2007-2008.

President, Pacific Division of the American Phytopathological Society, 2006-2007.

President-Elect, Pacific Division of the American Phytopathological Society, 2005-2006.


Professional Activities

  Member of the Pulse Crop Working Group addressing legume disease issues in Idaho,

             Washington, Montana, North and South Dakota, and Nebraska. 2009.

Member of the Pacific Northwest Vegetable Extension Group addressing gardener and

grower plant disorders in WA, OR, and ID.  Visit website at

Member of Smith’s Frozen Foods, Weston, OR, Advisory Committee for Sustainable


Member of the Green Pea Association Advisory Committee for the fresh pea industry in


Member of the Legume Variety Release Committee that coordinates the release of.

       legumes by Washington State University, the U.S. Department of  

       Agriculture, and Washington Counties to multiple states in the U.S.A.

Member of the Seed Crop Team, an integrated pest management team addressing pest issues in

            seed crops in Washington State.  Visit team website at


Member of the American Phytopathological Society

Member of the North American Pulse Improvement Association

Member of the Pisum Genetics Association



Last Modified: 3/30/2012
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