Plant Pathology Faculty

Gary E. Vallad

Gary E. Vallad
  • Ph.D., Plant Pathology, 2003, University of Wisconsin, Madison, WI
    Dissertation: The Effect of Paper Mill Residuals on Plant Disease and Innate Plant Defenses.
  • M.S., Crop and Weed Sciences, 1998, North Dakota State University, Fargo, ND
    Thesis: Characterization of Pto-Like Sequences in Common Bean.
  • B.S., Biotechnology and Microbiology, 1996, North Dakota State University, Fargo, ND
  • Assistant Professor of Plant Pathology, University of Florida, Institute of Food and Agricultural Science, Gulf Coast Research and Education Center, Balm.


Dr. Gary Vallad’s research and extension program focuses on the diagnosis and management of diseases common to vegetable and ornamental production in Florida with an emphasis on the development and implementation of bio-based disease management strategies.  His research utilizes traditional and contemporary approaches to study pathogen biology, disease epidemiology, and plant-pathogen interactions.  Current projects are focused on the management of diseases caused by Alternaria spp., Corynespora cassiicolaFusarium spp., Sclerotium rolfsii, and Xanthomonas spp. in vegetable and ornamental production, the assessment of chemical and biological alternatives to methyl bromide, and the characterization of tomato purple leaf disorder


  • Vallad, GE; Pernezny, KL; Balogh, B; Wen, AM; Figueiredo, JFL; Jones, JB; Momol, T; Muchovej, RM; Havranek, N; Abdallah, N; Olson, S; Roberts, PD. 2010. Comparison of Kasugamycin to Traditional Bactericides for the Management of Bacterial Spot on Tomato. HORTSCIENCE 45 (12): 1834-1840..
  • Maruthachalam, K; Atallah, ZK; Vallad, GE; Klosterman, SJ; Hayes, RJ; Davis, RM; Subbarao, KV. 2010. Molecular Variation Among Isolates of Verticillium dahliae and Polymerase Chain Reaction-Based Differentiation of Races. PHYTOPATHOLOGY 100 (11): 1222-1230..
  • Vallad, GE; Santos, BM. 2010. Influence of Shoot Pruning on Bacterial Spot Infestation on Tomato Cultivars. HORTTECHNOLOGY 20 (5): 847-851..
  • Santos, BM; Vallad, GE. 2010. Effects of Shoot Pruning on Bacterial Spot Infestation on Tomato Cultivars. HORTSCIENCE 45 (4): 500-500..
  • Klosterman, SJ; Atallah, ZK; Vallad, GE; Subbarao, KV. 2009. Diversity, Pathogenicity; and Management of Verticillium Species. ANNUAL REVIEW OF PHYTOPATHOLOGY 47: 39-62..
  • Hayes, RJ; Vallad, GE; McHale, LK; Truco, MJ; Ochoa, OE; Michelmore, RW; Klosterman, SJ; Maruthachalam, K; Subbarao, KV. 2009. Breeding for resistance - new approaches and challenges. PHYTOPATHOLOGY 99 (6): S168-S168, Suppl. S..
  • Karunakaran, M; Vallad, GE; Atallah, ZK; Klosterman, SJ; Davis, MR; Subbarao, KV. 2008. Analysis of molecular variability among the isolates of Verticillium dahliae from diverse host species based on fluorescence-based amplified fragment length polymorphism. PHYTOPATHOLOGY 98 (6): S78-S79, Suppl. S..
  • Wu, BM; Koike, ST; Vallad, GE; Subbarao, KV. 2008. Post-fumigation horizontal and vertical recolonization of soil by Verticilliium dahliae. PHYTOPATHOLOGY 98 (6): S173-S173, Suppl. S..
  • Qin, QM; Vallad, GE; Subbarao, KV. 2008. Characterization of Verticillium dahliae and V. tricorpus isolates from lettuce and artichoke. PLANT DISEASE 92 (1): 69-77..