Tom Evans


  • Ph.D., Botany and Plant, Pathology, Michigan State University, 1985
  • M.S., Botany, California, State Polytechnic University, 1978
  • B.S. (Honors), Botany, California State Polytechnic University, 1975

Current Courses

  • PLSC 140 People and Plants: Feast or Famine
  • PLSC 303 Introductory Plant Pathology
  • PLSC 616 Plant Virology


  • The emphasis of Dr. Evans’ research is on the identification, etiology and control of virus and fungal diseases of vegetable and field crops. A major focus of his research is to provide a better understanding of how plants respond to infection at the cellular and molecular level. The main goal of his work is to reduce crop losses through a better understanding of epidemics and the development of resistance. Dr. Evans’ laboratory currently works on the characterization of new races of the pathogen Phytophthora phaseoli, the causal agent of downy mildew of lima bean. Additionally his group is working on the development of resistant cultivars, and is developing a better understanding of the epidemiology of the disease and chemical and cultural methods of for its control. A new focus of his program is the evolution and functional genomics of P. phaseoli.
    Study Abroad Activities

  • Dr. Evans serves as the University of Delaware’s winter study abroad program co-director for Ecuador and the Galapagos(even-numbered years)
    Las Chagras, left to right Dr. Tom Evans, Dr. Cliff Keil, Dra. Rocio Bastidas and the real chagra at El Povenir in the Cotopaxi National Park.Study abroad in The Galapagos Islands (odd-numbered years)
    Pinnacle Rock 2005

Evans’ Laboratory Current Research Group

  • From left, Bekki Helton (post doctoral fellow), Dr. Ayman Esh (visiting scholar, Agricultural Research Center, Giza, Egypt), Sridhara Gupta Kunjeti (Ph.D. student), Tom Evans (principle investigator), Nancy Gregory (research associate and lab coordinator), Juan Sebastian (research assistant), David Nesnow (M.S. student).

Professional Activities

  • Member – American Phytopathological Society (APS)
  • Representative from APS Council to the International Society of Plant Pathology
  • Past member of the APS Council Financial Advisory Committee
  • Past Potomac Division Councilor
  • Past President – Potomac Division of APS
  • Sigma Xi
  • Beta Beta Beta

Recent Publications

Davidson C.R., T. A. Evans, R. P. Mulrooney, N. F. Gregory, R. B. Carroll and N.R. O’Neill. 2007. Lima bean downy mildew epidemics caused by new physiological races of Phytophthora Phaseoli. Plant Disease

Evans, T. A., Miller, L. C.,Vasilas, B. L., Taylor, R. W., and R.P. Mulrooney. 2007. Management of Xiphinema americanum and soybean severe stunt disease in soybean using crop rotation. Plant Disease 91(2):216-219.

Evans, T.A., Mulrooney, R.P. Gregory, N.F., and E. Kee. 2007. Lima bean downy mildew: impact etiology and management strategies for Delaware and the mid-Atlantic U.S.. Plant Disease 91(2):128-135 DOI:10.1094/PDIS-91-2-0128.

Santamaria, L. T.A. Evans, R.P. Mulrooney, and R.B. Carroll. 2006. Evaluation of USDA and CIAT lima bean germplasm accessions for resistance to downy mildew, 2005. Biological and Cultural Tests (online) Report 21:V013. The American PhytopathologicalSociety, St. Paul, MN.

Santamaria, L. T.A. Evans, R.P. Mulrooney, and R.B. Carroll. 2006. Evaluation of lima bean cultivars for resistance to downy mildew, 2005. Biological and Cultural Tests (online) Report 21:V014. The American Phytopathological Society, St. Paul, MN.

Davey, J.F., R.P. Mulrooney,T.A. Evans and R.B. Carroll. 2006. Timing of fungicide application for the control downy mildew of baby lima bean, 2005. Fungicide and Nematicide Tests (online) Report 61:V040. The American Phytopathological Society, St. Paul, MN.


Contact Information
Tom Evans


Plant and Soil Sciences
152 Townsend Hall

Newark, DE 19716
Phone: (302) 831-2534