Plant Pathology Faculty

David J. Norman

David J. Norman
  • Ph.D., 1993, University of Hawaii, Plant Pathology
  • M.S.,  1987, University of Hawaii, Horticulture
  • M.S.,  1984, Walla Walla College, Biology
  • B.S., 1981 Southwestern Adventist University, Biology


Emphasis has been centered on the study of diseases that affect the production of ornamental crops in Florida including foliage plants, cut foliage, potted flowering crops, and bedding plants. Research projects are designed to examine new disease controls, pathogen detection, and classification. Current projects include; 1) Identification of bacterial genes and their function during pathogenesis. 2) Studying the effect of temperature and infection as it relates to the bacterial wilt pathogen Ralstonia solanacearum.  3) Identification of bacterial effector targets within plants. 4) Screening for disease resistance within ornamental plants.  5) Examining the evolutionary relationship of xanthomonad species infecting ornamental plant species. And 6) development of disease management strategies for growers utilizing both standard chemistry and biological control. .I maintain an active extension program, including a weekly plant diagnostic clinic. Annually, I also deliver numerous talks to ornamental plant producers and other interested audiences.

Selected Publications

  • Potnis, N., Minsavage, G.V., Smith, J.K., Hulbert, J. Norman, D., Rodriques, R., Stall, R.E., and Jones, J. P., 2012.  Avirulence proteins AvrBs7 from Xanthomonas gardneri and AvrBs1.1 from Xanthomonas euvesicatoria contribute to a novel gene-for-gene interaction in pepper.  MPMI 25: 307-320.
  • Bocsanczy, A. M., Achenbach, U., Mangravita – Novo, A., Yuen, J.M.F. and. Norman, D. J., 2012  Comparative effect of low temperature on virulence and twitching motility of Ralstonia solanacearum strains present in Florida. Phytopathology 102:185-194.
  • Norman, D. J., Dickstein, E.R., and Yuen, J.M.F.  2011.  Inhibition of Rhizoctonia by endospore forming bacteria indigenous to landscape planting.  Biocontrol Science and Technology, 21: 1133-1142.
  • Norman, D.J., and  Chen, J. 2011.  Effect of Foliar Application of Titanium Dioxide on Bacterial Blight of Geranium and Xanthomonas Leaf Spot of Poinsettia HortScience 45: 426-428.
  • Norman, D.J., Yuen, J.M.F., Mangravita-Nova, A., and  Byrne, D.   2009.  Susceptibility of Geranium Cultivars to Ralstonia solanacearum HortScience 44 (5):1504-1508.
  • Norman, D.J.,. Zapata, M., Gabriel, D.W., J.T., Duan, Yuen, J.M.F., Mangravita-Nova, A., and Donahoo, R.S.  2008.  Genetic diversity and host range variation of Ralstonia solanacearum strains entering North America.  Phytopathology 99:1070-1077.
  • Henny R.J., J. Chen, and Norman, D.J.  2007. "'Tropic Honey' Dieffenbachia".HortScience 42:398.
  • Rademaker, J.L.W., Norman D.J., Forster R.L., Louws, F.J., Schultz, M.H. and de Bruijn, F.J.  2006.  Classification and identification of Xanthomonas translucens isolates including those pathogenic to ornamental asparagus  Phytopathology 96(8):876-884.
  • Henny R.J., J. Chen, and Norman, D.J.  2006.  ‘Sterling’ Dieffenbachia.HortScience 41(5):1356.
  • Norman, D.J., Chen, J. Mangravita-Nova, A., and Yuen, J.M.F.  2006.  Control of Bacterial Wilt of Geranium with Phosphorous Acid.  Plant Dis. 90:798-802.
  • Gabriel, D.W., Allen, C., Schell, M., Denny,T., Greenberg, J.T., Duan, Y.P., Flores-Cruz, Z., Huang, Qi, Clifford, J.M., Presting, G., Gonzalez, E., Reddy, J., Elphinstone, J., Swanson, Yao, J., Mulholand, V., Liu, L., Farmerie, W., Patnaikuni, M., Balogh, B., Norman, D., Alvarez, A., Castillo, J.A., Jones, J., Saddler, G., Walunas, T., Zhukov, A., and Mikhailova, N.  2006. Identification of open reading frames unique to a select agent:  Ralstonia solanacearum Race 3 Biovar 2.  MPMI 19:69-79.
  • Chen, J.J., Davanand, P.S, Henny, R.J., Norman, D.J., and Chao, C.T.  2004.  Interspecific relationships of Alocasia revealed by AFLP analysis.  J. Hort. Sci.& Biotechnology.  79(4): 582-586.
  • Henny R.J., Norman, D.J., and Chen, J.  2004.  ‘GoldenRush dieffenbachia.  HortScience 39(6): 1505-1506.
  • Chen, J.J., Davanand, P.S., Norman, D.J., Henny, R.J., and Chao, C.T.  2004.  Genetic relationship of Aglonema species and cultivars inferred from AFLP markers.  Annals of Botany. 93(1): 157-166.
  • Chen, J.J., Henny, R.J., Norman, D.J., Davanand, P.S., and Chao, C.T.  2004.  Analysis of the genetic relatedness of Dieffenbachiae cultivars using AFLP markers.  J. Amer. Soc. Hort. Sci. 129(1): 81-87.
  • Henny R.J., J. Chen, and Norman, D.J.  2003.  Aglaonema ‘Emerald Bay’ and ‘Diamond Bay’.HortScience 38(7): 1446-1447.
  • Norman, D.J., Yuen, J.M.F., Resendiz, R., and Boswell, J.  2003.  Characterization of Erwinia populations from nursery retention ponds and lakes infecting ornamental plants in Florida.  Plant Dis.  87: 193-196.