Gregory E. MacDonald


Gregory E. MacDonald is a Professor of Weed Science and Agronomy at the University of Florida.  He received his          B.S. in Plant Science from Cornell University and a M.S. and PhD in Agronomy – Weed Science from the University of Florida.  He was employed as an assistant professor at The University of Georgia prior to his current position at the University of Florida.

He currently holds a 65%/35% teaching and research appointment and he teaches the introductory weed science course, two graduate level courses in weed science, and two agronomic production courses.

His research focuses on invasive plant management and biology, with an emphasis on perennial grasses.   He has authored or co-authored over 60 refereed journal articles, over 200 abstracts and 225 non-refereed papers and articles.  He has also presented at over 500 conferences, field days, county meetings and workshops.

His funding at the University of Florida is over $4 million for his career.  Dr. MacDonald also has considerable international experience with a large USAID funded projects in Guyana, South America, Ghana, and Haiti, focusing on production systems for peanut.  He has trained several M.S. and PhD students and is active in several weed science related societies.

He has also served as the Plant and Soil Science coordinator for the Doctor of Plant Medicine program since its inception.  He has served as president of the Florida Weed Science Society and the Aquatic Plant Management Society.  He has also served on the Weed Science Society Board of Directors for two terms as the APMS representative and chair of the education and extension committees.  He also served as Secretary-Treasurer for the Southern Weed Science Society.

He also works in international agronomy, focusing on peanut production and utilization for rural farmers and households.

“My research focus includes management of invasive grasses in natural ecosystems and physiological and biochemical aspects of herbicides in terrestrial and aquatic weedy species.”

Contact Information


Phone: (352) 392-1811 ext 228
Fax: (352) 392-1840

View Detailed Resume



  • A.A.S. Agricultural Engineering, Alfred State College, 1983
  • B.A. Plant Sciences, Cornell University, 1986
  • M.S. Department of Agronomy, University of Florida, 1991
  • Ph.D. Department of Agronomy, University of Florida, 1994

Research Interests

  • invasive plant management
  • physiological and biochemical interactions of herbicides and plants
  • terrestrial perennial (emphasis on grasses) and aquatic plant physiology
  • International Agronomy - Peanut Collaborative Research Support Program in Guyana, South America


  • See Curriculum Vitae

Courses Taught

Honors and Professional Activities

I'm involved in several state, regional and national societies at various capacities. Please see below specifics regarding those organizations in which I am involved:

  • Aquatic Plant Management Society - President 2009-2010
  • American Peanut Research and Education Society - Local Arrangements Chair 2003, 2010
  • Southern Weed Science Society - Local Arrangements Chair 2008, 2009, 2011
  • Weed Science Society of America - Local Arrangements Chair 2009
  • University of Florida - Faculty Senate 2009-present
  • Florida Weed Science Society - Past President and current Membership and Newsletter Chair
  • Florida Exotic Pest Plant Council - Exotic Grasses Task Force Chair

Current and Former Students

  • Jim Boyer - graduated 2009. Influence of Timing and Herbicide Rate for Peanut Cultivars
  • Kurt Vollmer - expected graduation Spring 2010. Physiological and Biochemical Responses of Native and Exotic Weedy Species in Natural Areas
  • Courtney Stokes - current. Biology, Ecology and Management of Natalgrass (Melinis repens)
  • Sarah Berger - current. Herbicide Uptake and Translocation in Submersed Aquatic Weeds
  • Anna Greis - current. Impact of Herbicide Residual Activity on Native Plant Restoration for Cogongrass Infestations

Other Information

  • originally from Upstate New York - Finger Lakes region - Geneva, NY is my home town
  • involved in Cub Scouts and Boy Scouts - Assistant Cub Master and Webelos Leader Pack 127, Woodbadge SR-952 (Owl)
  • collect antique garden tractors - primarily Bolens, Planet Jr. and David Bradley from the 1940's and 1950's