Jennifer Parke
Professor, Senior Research, Soil Biology

Ecology of plant-associated soil microbes; plant pathology.

OSU Campus
Department of Crop and Soil Science
3051 Ag & Life Sciences Building
Corvallis, OR 97331
United States
(541) 737-8170


  • Phytophthora diseases of woody plants
  • Management of Phytophthora diseases in horticultural nurseries and native plant nurseries
  • Soil solarization for management of soilborne plant pathogens and weeds
  • Oomycete communities in water and soil
  • Arbuscular mycorrhizal fungi

Senior Faculty Research Associate 

Joyce Eberhart

Postdoctoral Associates:

Dr. Ebba Peterson (Botany and Plant Pathology)

Dr. Neelam Redekar (Crop and Soil Science)

Graduate Students:

Chris Benemann (M.S. student, Botany and Plant Pathology)

Clara Weidman (M. S. student, Soil Science)


Agricultural and Environmental Predicaments: a Case Study Approach. (SOIL 325). Winter Term. Writing intensive class.

I accept graduate students in Crop and Soil Science and Botany and Plant Pathology.


Education and Employment

  • B.A. Biology, University of California, Santa Cruz
  • Ph.D. Botany and Plant Pathology, Oregon State University
  • Fulbright Postdoctoral Fellow, CSIRO, Australia
  • Assistant Professor, Dept. of Plant Pathology, Univ. of Wisconsin-Madison
  • Associate Professor, Dept. of Plant Pathology, Univ. of Wisconsin-Madison


Peer-reviewed Publications (recent)

Funahashi, F.  and Parke, J. L. 2016. Effects of soil solarization and Trichoderma asperellum on soilborne inoculum of Phytophthora ramorum and Phytophthora pini in container nurseries. Plant Dis. 100:438-443. (.PDF)

Raudales, R.E., J.L. Parke, C.L. Guy, and P.R. Fisher.  2014.  Control of waterborne microbes in irrigation: a review.  Agricultural Water Management 143:9-28.

Parke, J.L., Knaus, B.J., Fieland, V.J., Lewis, C., and Grünwald, N.J. 2014. Phytophthora community structure analyses in Oregon nurseries inform systems approaches to disease management. Phytopathology 104:1052-1062.

Oßwald, W., Fleischmann, F., Rigling, D., Coelho, A. C., Cravador, A., Diez, J. Dalio, R. J., Horta, M., Jung, T., Pfanz, H., Robin, C., Sipos, G., Solla, A., Cech, T., Chambery, A., Diamandis, S., Hansen, E., Jung, T., Orlikowski, L. B., Parke, J., Prospero, S., Werres, S. 2014. Strategies of attack and defence in woody plant–Phytophthora interactions. Forest Pathology 44:169-190.

Liebhold, A. M., Brockerhoff, E. G., Garrett, L. J., Parke, J. L., and Britton, K. O. 2012. Live plant imports: the major pathway for forest insect and pathogen invasions of the US. Frontiers in Ecology and the Environment 10: 135–143

Parke, J. L. and N. J. Grünwald. 2012. A systems approach for management of pests and pathogens of nursery crops. Plant Dis. 96: 1236-1244

Grünwald, N. K., Martin, F. N., Larsen, M., Sullivan, C., Press, C. M., Coffey, M. D., Hansen, E. M., and Parke, J. L. 2011. A sequence based Phytophthora identification tool. Plant Dis. 95:337-342.

Ochiai, N., Dragila, M. I., and Parke, J. L. 2011. Pattern swimming of Phytophthora citricola zoospores: an example of microbial bioconvection. Fungal Biology 115:228-235.

Manter, D.K.,  Kolodny, E. H., Hansen, E. M., Parke, J. L.  2010. Virulence, sporulation, and elicitin production in three clonal lineages of Phytophthora ramorum. Physiol. Molecular Plant Pathol. 74:317-322.

Ochiai, N. Dragila, M. and Parke, J. 2010. Three-dimensional tracking of colloids at the pore scale using epifluorescence microscopy.Vadose Zone J. 9:1–12.

Collins, B., Parke, J. L., Lachenbruch, B., and Hansen, E. M. 2009.The effects of Phytophthora ramorum infection on hydraulic conductivity and tylosis formation in tanoak sapwood. Can. J. For. Res. 39:1766-1776.

Grünwald, N. et al.  2009. Standardizing the nomenclature for clonal lineages of the sudden oak death pathogen, Phytophthora ramorum. Phytopathology 99:792-795.

Parke, J. L. and Lewis, C 2007. Root and stem infection of rhododendron from potting medium infested with Phytophthora ramorum. Plant Dis. 91:1265-1270.

Parke, J. L., Oh, E., Voelker, S., Hansen, E.M., Buckles, G., and Lachenbruch, B. 2007.Phytophthora ramorum colonizes tanoak xylem and is associated with reduced stem water transport. Phytopathology 97:1558-1567.

Hansen, E. M., Parke, J. L., and Sutton. W. 2005. Susceptibility of Oregon forest trees and shrubs to Phytophthora ramorum: a comparison of artificial inoculation and natural infection. Plant Dis. 89:63-70.

Outreach and Extension

Outreach Publications (recent)

Parke, J. and Funahashi, F. 2016. Soil solarization in container nurseries and field production. Digger 60:33-36. (.PDF)

Stoven, H. and Parke, J. 2014. Nasty Nostoc. Digger 58:25-29. 

Parke, J. and Funahashi, F. 2013. Putting the sun to work: solarization can be an effective way to kill pests, pathogens, and weeds. Digger 57:33-36.

Dick, M. and Parke, J. 2012. Phytophthora kernoviae. Forest Phythophthoras 2(1)

Griesbach, J.A., Parke, J. L., Chastagner, G.C., Grunwald, N.J., Aguirre, J.  2012. Safe procurement and production manual: a systems approach for the production of healthy nursery stock. 2nd ed. Oregon Association of Nurseries, Wilsonville, OR. 100 pp. (.PDF)

Oh, E. and Parke, J. 2012. Phytophthora katsurae. Forest Phytophthoras 2(1).  

Parke, J.  and Fisher, P. 2012. Treating irrigation water to eliminate water molds. Pages 5-47 through 5-49 in: Pacific Northwest Plant Disease Management Handbook (J. W. Pscheidt and C. M. Ocamb, eds.) A Pacific Northwest Extension Publication (Oregon State University, Washington State University, and University of Idaho).

Parke, J. and Fisher, P. 2012. Treating irrigation water. Digger 56 (2):41-45. (.PDF)

Parke, J. L. and Rizzo, D. M. 2011. Phytophthora ramorum.  Forest Phytophthoras 1(1).

Parke, J. L. 2011.A new approach to pests: research into systems approaches is yielding new tools for healthy plant production.  Digger 55(8):155-160. (.PDF)

Parke, J. L. and Lewis, C. 2011. Protecting container-grown plants. Digger 55(2):41-45. (.PDF)

Fisher, P., Meador, D., Parke, J., Wick, R., and Argo, W. 2011. Water quality: what’s in your water? Greenhouse Management (Oct. issue).

Parke, J. 2010. Reducing Phytophthora: these top 10 tips will help prevent this group of pathogens from taking hold. Digger 54(9):41-47. (.PDF)

Parke, J. L., Grünwald, N., and Lewis, C. 2009. Tracing the path of pathogens. Digger 53(12): 43-51. (.PDF)

Parke, J. L., and S. Lucas. 2008. Sudden oak death and ramorum blight. The Plant Health Instructor

Fun Fact

I play fiddle in the Celtic band “Lark”