Scott A. Isard, Dr.

Scott A. Isard, Dr.

  • Professor of Aerobiology
  • Departments of Plant Pathology and Environmental Microbiology and Meteorology and Atmospheric Sciences
205 Buckhout Laboratory
University Park, PA 16802
Phone: (814) 865-6290


  1. PhD – Indiana University



Integrated Pest Information Platform for Extension and Education (iPiPE)

Research Interests

  • Biological and meteorological factors that govern the aerial movement of biota
  • Aerobiology, integrated pest management, food safety, and biosecurity
  • Applications of integrative aerobiology forecasting systems to resistance management, sustainable agriculture issues, and investigations of impacts of climate change on society

Teaching Interests

  • Aerobiology
  • Detection, dynamics and diagnostics of agricultural pests and pathogens

Selected Publications

  • Galan, C., A Ariatti, M. Bonini, B. Clot, B. Crouzy, A. Dahl, C. Fernandez-Gonzalez, G. Frenguelli, R. Gehrig, S. Isard, E. Levetin, D.W. Li, P. Mandrioli, C.A. Rogers and M. Thibaudon. 2017. Recommended terminology for aerobiological studies. Aerobiologia 33:293–295.

    Willbur, J.F., M. L. Fall, C. Bloomingdale, A.M. Byrne, S.A. Chapman, S.A. Isard, R.D. Magarey, M.M. McCaghey, B.D. Mueller, J.M. Russo, J. Schlegel, M.I. Chilvers, D.S. Mueller, M.Kabbage, and D.L. Smith. 2017 Weather-based models for assessing the risk of Sclerotinia sclerotiorum apothecial presence in soybean (Glycine max) fields. Plant Disease DOI: 10.1094/PDIS-04-17-0504-RE

    Margarey, R. and S.A. Isard. 2016. A troubleshooting guide for mechanistic plant pest forecast models. Journal of Integrated Pest Management. 38: 1–7.

    Isard, S.A. and M. Chamecki. 2016. A physically-based theoretical model of spore deposition for predicting spread of plant diseases. Phytopathology106:244-253.

    Isard, S.A., J.M. Russo, R.D. Magarey, J. Golod and J.R. VanKirk, 2015. Integrated Pest Information Platform for Extension and Education (iPiPE): Progress through sharing. Journal of Integrated Pest Management 6(1): 15; DOI: 10.1093/jipm/pmv013.

    Pan, Y., M. Chamecki, S.A. Isard and H.M. Nepf, 2015. Dispersion of particles released at the leading edge of a crop canopy.  Agricultural and Forest Meteorology 211-212: 37-47.

    Kelly, H.Y., N.S. Dufault, D.R. Walker, S.A. Isard, R.W. Schneider, L.J. Giesler, D.L. Wright, J.J. Marois, and G.L. Hartman, 2015. From select agent to an established pathogen: The response to Phakopsora padchyrhizi (soybean rust) in North America.  Phytopathology 105: 905-916.

    Sanatkar, M.R., C. Scoglio, B. Natarahan, S.A. Isard and K. A. Garrett. 2015. History, epidemic evolution, and model burn-in for a network of annual invasion: soybean rust. Phytopathology 105: 947-955.

    Skarpaas, O., E. Jongejans, M. J. Ferrari, E. S. Long, J. T. Dauer, C. M. Schwarz, E. S. J. Rauschert, R. Jabbour, D. A. Mortensen, S. A. Isard, D. A. Lieb, Z. Sezen, A. G. Hulting, and K. Shea. 2014. A unified gravity approach to dispersal. Theoretical Ecology. DOI 10.1007/s12080-014-0245-5.

    Pan, Y., M. Chamecki, and S.A. Isard, 2014. Large-eddy simulation of spore dispersion inside the canopy roughtness sublayer, Journal of Fluid Mechanics 753: 499-534.

    Gleicher, S.C.., M. Chamecki, S.A. Isard, Y. Pan, and G.G. Katul, 2014. Interpreting three-dimensional spore concentration measurements and escape fraction in a crop canopy using a coupled Eulerian-Lagrangian stochastic model, Agricultural and Forest Meteorology 194: 118–131.

    Sikora, E. J., Allen, T. W., Wise, K. A., Baniecki, J., Bergstrom, G., Bradley, C., Brown-Rytlewski, D., Chilvers, M., Coker, C., Damicone, J., DeWolf, E., Dorrance, A., Dufault, N., Esker, P., Faske, T., Giesler, L., Grau, C., Golod, J., Grybauskus, A., Franc, G., Hammerschmidt, R., Hartman, G., Henn, A., Hershman, D., Hollier, C., Isakeit, T., Isard, S., Jacobson, B., Jardine, D., Kemerait, B., Koenning, S., Malvick, D., Markell, S., Marois, J., Monfort, S., Mueller, D., Mueller, J., Mulrooney, B., Newman, M., Osborne, L., Padgett, G.B., Ruden, B., Rupe, J., Schneider, R., Schwartz, H. Shaner, G., Singh, S., Stromberg, E., Sweets, L., Tenuta, A., Trippett, C., Vaiciunas, S., Yang, X.B., Zidek, J., 2014. A coordinated effort to manage soybean rust in North America: a success story in soybean disease monitoring. Plant Disease 98: 864-875.

    Luck, J., Campbell, I., Magarey, R., Isard, S., Aurambout, J-P., Finlay, K. 2013.  Climate change and plant biosecurity–Implications for policy. Plant Biosecurity Handbook.  In “Principles and Practices for the Identification, Containment and Control of Organisms that Threaten Agriculture and the Environment Globally.” Gordh, G; McKirdy, S. (Eds.) Springer, NY.  760 p.

    Neufeld, K.N., S.A. Isard, and P.S. Ojiambo, 2013. Quantifying the relationship between disease severity and concentration and escape of Pseudoperonospora cubensis sporangia from a cucumber canopy.  Plant Pathology 62. 1366-1377.

    Pan Y., M. Chamecki, and S.A. Isard, 2013. Dispersion of heavy particles emitted from area sources in the unstable atmospheric boundary layer, Boundary Layer Meteorology 146, 235-256.

    Chamecki, M., N.S. Dufault, and S.A. Isard, 2012. Atmospheric dispersion of wheat rust spores: a new theoretical framework to interpret field data and estimate downwind dispersion. Journal of Applied Meteorology and Climatology 51: 672-685.

    VanKirk, J.R., S.A. Isard, K.F. Cardwell, and M.A. Draper. 2012.  The ipmPIPE: Overviews, Lessons, Opportunities, and Challenges.  Journal of Integrated Pest Management 3(2) 2012; doi:

    Sutrave, S., C. Scoglio, S.A. Isard, J.M. Shawn Hutchinson, and K. A. Garrett. 2012. Identifying highly connected counties compensates for resource limitations when evaluating national spread of an invasive pathogen.  PLoS ONE 7(6): e37793. doi:10.1371/journal.pone.0037793

    Pan, Y, S.A. Isard, and M. Chamecki. 2012. Dispersion of heavy particles emitted from area sources in the unstable atmospheric boundary layer. Boundary Layer Meterorology 146: 235–256.

    Isard, S.A., C.W. Barnes, S. Hambleton, A. Ariatti, J.M. Russo, A.Tenuta, D.A. Gay and L.J. Szabo. 2011. Predicting seasonal soybean rust incursions into the North American continental interior using sentinel plot monitoring, spore trapping, and aerobiological modeling. Plant Disease 95:1346-1357.

    Chamecki, M., S.C. Gliecher, N.S. Dufault, and S.A. Isard, 2011. Diurnal variation in settling velocity of pollen released from maize and consequences for atmospheric dispersion and cross-pollination. Agricultural and Forest Meteorology 151: 1055–1065.

    Russo, J. M. and S. A. Isard, 2011. Online Aerobiology Process Model. In Clay, S. A. [ed.], GIS Applications in Agriculture, Volume Three: Invasive Species. CRC Press. New York, 159-166.

    Dufault, N.S., S.A. Isard, J.J. Marois, and D.L. Wright.  2010.  Wet deposition of Phakopsora pachyrhizi urediniospores into a soybean canopy.  Canadian Journal of Phytopathology 32:162-169. 

    Dufault, N.S., S.A. Isard, J.J. Marois, and D.L. Wright.  2010.  Removal of Wet Deposited Phakopsora pachyrhizi Urediniospores from Soybean Leaves by Subsequent Rainfall. Plant Disease 94:1336-1340.

    Marchetto, K. M., E. Jongehans, K. Shea and S. A. Isard, 2010.  Plant Spatial Arrangement Affects Projected Invasion Speeds of Two Invasive Thistles. Oikos 119: 1462-1468.

    Dufult, N.S. and S. A. Isard.  2010.  A portable rainfall simulator for evaluating the wet deposition of plant pathogens.  Applied Engineering in Agriculture 26:71-78.