Emily Pfeufer

Professional Profile

Extension Assistant Professor

Extension Specialist in Plant Pathology



  • Diseases of tobacco and vegetables (field and greenhouse production systems)
  • Design and deliver research-based training for Extension agents, industry professionals, and tobacco and vegetable growers in Kentucky
  • Serve as an unbiased plant pathology connection among UK research programs, industry professionals, the Commonwealth of Kentucky, and commercial producers
  • Contribute timely, field-based vegetable and tobacco disease management expertise to teams across UK-CAFE, the Commonwealth, and the region


  • Optimize integrated disease management programs for tobacco and vegetable systems through on-farm research, with interests in cultural control methods, pathogen detection and monitoring, expert systems, fungicide and biorational product evaluations, and new and rotational crops.

Additional Information


  • Ph.D. in Plant Pathology, 2014, The Pennsylvania State University
  • M.S. in Plant Pathology, 2010, The Pennsylvania State University
  • B.S. in Biology, 2008, Allegheny College (PA)

Employment Highlights

  • Assistant Extension Professor, University of Kentucky, 2015 - present
  • Postdoctoral Scholar, The Pennsylvania State University, 2014 - 2015

Professional Affiliations & Service

  • American Phytopathological Society, 2010 - present
  • Southern Division member, 2015 - present
  • Northeastern Division member, 2013 - present
  • Extension Committee member, 2012 - present
  • Peer reviewer for Plant Disease (2015 - present) and Crop Protection (2014) 
  • Gamma Sigma Delta Agricultural Honor Society, 2009 - present

Research Publications


  • Ramos, L. S., Sinn, J. P., Lehman, B. L., Pfeufer, E. E., Peter, K. A., McNellis, T. W. 2015. An Erwinia amylovora pyrC mutant is auxotrophic for pyrimidine yet causes fire blight in apple tree shoots and grows in immature pear and apple fruit tissue. Letters in Applied Microbiology; accepted.
  • Pfeufer, E. E., Hoepting, C. A., Gugino, B. K. 2015. Identification of the most important factors driving bacterial bulb rot of onion in New York and Pennsylvania and implications for management. Empire Expo Conference Proceedings. Link


  • Pfeufer, E. E., interview with Bogash, S. 2014. Managing bacterial diseases in onions. Penn State Extension Vegetable and Small Fruit Gazette. Link


  • Ramos, L. S., Lehman, B. L., Sinn, J. P., Pfeufer, E. E., Halbrendt, N. O., McNellis, T. W. 2013. The fire blight pathogen Erwinia amylovora requires the rpoN gene for pathogenicity in apple. Molecular Plant Pathology 14: 838 – 843.
  • Gugino, B. K., Pfeufer, E. E. 2013. Evaluate the effects of inoculum pressure and onion maturity at harvest on harvest and post-harvest losses due to bacterial diseases. 5 pp


  • Gugino, B. K., Stoltzfus, J., Pfeufer, E. E., Mansfield, M. A. 2012. Final report to the Pennsylvania Vegetable Marketing and Research Program and Pennsylvania Vegetable Growers Association. “Evaluate the efficacy of alternative in-season management products and fertility treatments on yield and the development of onion bacterial diseases.” 3 pp. 
  • Pfeufer, E. E., Ngugi, H. K. 2012. Orchard factors associated with resistance and cross-resistance to sterol demethylation inhibitor fungicides in populations of Venturia inaequalis from Pennsylvania. Phytopathology 102: 272-282.


  • Ngugi, H. K., Pfeufer, E. E. 2010. Resistance to DMI (SI) fungicides in populations of Venturia inaequalis, the apple scab pathogen, from Pennsylvania apple orchards. Pennsylvania Fruit News Vol. 90(2):31-36.
  • Brazelton, J., Pfeufer, E. E., Sweat, T., McSpadden Gardener, B., Coenen, C. 2008. 2,4-diacetylphloroglucinol alters plant root development. Molecular Plant Microbe Interactions 21: 1349-1358.