Andrew Jarosz, Ph.D.

Andrew Jarosz

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Associate Professor - Disease epidemiology; ecology and evolution of plant pathogens.
Department of Plant, Soil and Microbial Sciences



PhD., Purdue University 

My lab is investigating the use of fungal viruses as a potential biological control agent of forest pathogens. We are studying hypoviruses that infect Cryphonectria parasitica, the cause of chestnut blight. Our work has documented that chestnut populations recover in situations where the hypovirus has invaded 80% or more of theC. parastica population. Much of our current work is focused on determining conditions that are conducive for hypovirus spread. We are also investigating the evolution of fungicide resistance. Current work has centered on developing a rapid assay for detecting resistance to strobilurins in the apple scab pathogen Venturia inaequalis. Our ultimate goal is to investigate whether various application schemes (e.g., blocking or alternating chemistries) inhibit or delay the evolution of fungicide resistance.

Courses taught:

  • PLP 812 Disease Epidemiology 
  • ZOL 445 Undergraduate Evolution 


  1. Taylor, D.R., A.M. Jarosz, R.E. Lenski and D.W. Fulbright. 1998. The acquisition of hypovirulence in host-pathogen systems with three trophic levels. American Naturalist 151:343-355.
  2. Byrne, J.M., M.K. Hausbeck, C. Meloche, and A.M. Jarosz. 1998. Influence of dew period and temperature on foliar infection of greenhouse-grown tomato by Colletotrichum coccodes. Plant Disease 82:639-641.
  3. Hart, LP and AM Jarosz. 2000. Plant pathogen ecology and management. Pages 69-83. In: Michigan Field Crop Pest Ecology and Management, Cavigelli, MA, SR Deming, LK Probyn and DR Mutch eds. Michigan State University Extension Bulletin E-2704.
  4. Jarosz, A.M. 2002. Virulence management in plant-pathogen interactions: Accounting for seasonal variation and metapopulation structure. Pp. 389-400. In: Adaptive Dynamics of Infectious Diseases: In Pursuit of Virulence Management, U. Dieckmann, J.A.J. Metz. M.W. Sabelis and K. Sigmund. Cambridge Studies in Adaptive Dynamics.
  5. Desjardins, A.E., Jarosz, A.M., Plattner, R.D., Alexander, N.J., Brown, D.W., Jurgenson, J.E. 2004. Patterns of trichothecene production, genetic variability, and virulence to wheat of Fusarium graminearum from smallholder fams in Nepal. Journal of Agricultural and Food Chemistry 52:6341-6346.
  6. Davelos, A.L., Jarosz, A.M. 2004. Demography of American chestnut populations: effects of pathogen and a hyperparasite. Journal of Ecology 92:675-685.
  7. Desjardins, AE, CM Maragos and AM Jarosz, 2006. Emerging Mycotoxins: the Case for Nivalenol. ACS Society Symposium on Grain Quality.


Papers in preparation:

  1. Jarosz, AM, M Double, BW MacDonald, S Dahir, AL Davelos & DW Fulbright. Spatial patterns and hypoviruses spread within the West Salem chestnut stand. Canadian Journal of Plant Pathology.