Mark Gleason

Professor of Plant Pathology and Horticulture
313 Bessey

Department of Horticulture

Iowa State University
Ames IA, 50011-1100



  • Doctor of Philosophy, Plant Pathology, University of Kentucky, 1985
  • Doctor of Philosophy, Environmental Sciences, University of Virginia, 1980
  • Master of Science, Environmental Sciences, University of Virginia, 1976
  • Bachelor of Science, Biology, Carleton College, 1972

Awards/Special Recognition

  • Lee M. Hutchins Award, American Phytopathological Society, 2004
  • Outstanding Achievement in Extension and Professional Practice, Iowa State University, 2001
  • Merit Award, Iowa State Horticultural Society, 1998
  • Excellence in Extension Award, American Phytopathological Society, 1997

Research Focus

Dr. Gleason's research focuses on ecology and management of diseases of horticultural commodities (fruits, vegetables, ornamentals, shade trees, and turfgrasses).

Teaching/Advising Responsibilities

Dr. Gleason's teaching responsibilities are: 1) Integrated Management of Turfgrass Diseases and Insects (Hort/Pl P/Ent 452/552); 2) Ecologically Based Pest Management (Sus Ag 530); 3) Environmental and Sustainable Horticulture (Hort 424/524); and 4) Integrated Management of Tropical Crops (Hort/Pl P/Ent 511).

Selected Publications

  • Sentelhas, P.C., Gillespie,T.J., Gleason, M.L., Monteiro, J.E.B.A., and Helland, S.J. 2004. Operational exposure of leaf wetness sensors. Agricultural and Forest Meteorology:In press.
  • Kim, K.-S., Taylor, S.E., and Gleason, M.L. 2004. Development and validation of a leaf wetness duration model using a fuzzy logic system. Agricultural and Forest Meteorology: Accepted.
  • Babadoost, M., Gleason, M.L., McManus, P.S., and Helland, S.J. 2004. Evaluation of a wetness-based warning system and reduced-risk fungicides for management of sooty blotch and flyspeck of apple. HortTechnology 14:27-33.
  • Edmunds, B.A., Flynn, P.F., and Gleason, M.L. 2003. Hosta takeover: A plant disease management case study. Plant Health Instructor: (
  • Tarnowski, T.L., Batzer, J.C., Gleason, M.L., and Dixon, P.M. 2003. Fungicide sensitivity of newly discovered members of the sooty blotch and flyspeck complex on apples. Plant Health Progress: (
  • Edmunds, B. A., and Gleason, M. L. 2003. Perennation of Sclerotium rolfsii var. delphinii in Iowa. Online. Plant Health Progress: doi:10.1094/PHP-2003-1201-01-RS.
  • Leandro, L.F.S., Gleason, M.L., Nutter, F.W., Jr., Wegulo, S.N., and Dixon, P.M. 2003. Strawberry plant extracts stimulate secondary conidiation by Colletotrichum acutatum on symptomless leaves. Phytopathology 93:1285-1291.
  • Edmunds, B.A., and Gleason, M.L. 2003. First report of petiole rot of Pulmonaria longifolia caused by Sclerotium rolfsii var. delphinii. Plant Disease 87:15.
  • Edmunds, B.A., Gleason, M.L., and Wegulo, S.N. 2003. Resistance of hosta cultivars to Sclerotium rolfsii var. delphinii crown rot. HortTechnology 13:302-305.
  • Leandro, L.F.S., Gleason, M.L., Nutter, F.W., Jr., Wegulo, S.N., and Dixon, P.M. 2003. Influence of temperature and wetness duration on conidia and appressoria of Colletotrichum acutatum on symptomless strawberry leaves. Phytopathology 93:51-520.
  • Thorpe, D.J., Leandro, L.F.S., Gleason, M.L., Wegulo, S.N., and Wise, K.A. 2003. Evaluation of fungi and bacteria for biological control of Colletotrichum acutatum on strawberry leaves. Advances in Strawberry Research 22:14-19.
  • Wise, K.A., Leandro, L.F.S., Wegulo, S.N., and Gleason, M.L. 2003. Survival and dispersal of Colletotricum acutatum on strawberry foliage under field conditions. Advances in Strawberry Research 22:20-25.
  • Kim, K.-S., Taylor, S.E., and Gleason, M.L. 2002. Modeling an optimal set of variables for estimation of leaf wetness duration using an empirical method. Korean Journal of Agricultural and Forest Meteorology 4:23-28.
  • Kim, K.-S., Taylor, S.E., Gleason, M.L., and Koehler, K.J. 2002. A model to enhance site-specific estimation of wetness duration using a wind speed correction. Plant Disease 86:179-185.
  • Madeira, A.C., Taylor, E.S., Kim, K.-S., and Gleason, M.L. 2002. A simple cloud-based energy balance model to estimate dew. Agricultural and Forest Meteorology 111:55-63.
  • Batzer, J.C., Gleason, M.L., Dixon, P.M., and Nutter, F.W. Jr. 2002. Evaluation of post-harvest removal of sooty blotch and flyspeck on apples using sodium hypochlorite, hydrogen peroxide with peroxyacetic acid, and soap. Plant Disease 86:1325-1332.
  • Leandro, L.F.S., Gleason, M.L., Wegulo, S.M., Dixon, P., and Nutter, F.W., Jr. 2001. Survival and sporulation of Colletotrichum acutatum on symptomless strawberry leaves. Phytopathology 91:659-664.
  • Gleason, M.L., Taylor, S.E., Villalobos Flores, R., Arauz, L.F., and Kim, K.-S. 2001. Assessment of the accuracy of site-specific estimates of rainfall, air temperature, relative humidity, and wetness duration in the Northern Pacific Region of Costa Rica. Agronomia Costarricense 25:45-55.