Plant Pathology Faculty

Andrew C. Schuerger

Andrew Schuerger
  • B.S., University of Arizona, 1979
  • M.S., University of Arizona, 1981
  • Ph.D., University of Florida, 1991

Dr. Andrew C. Schuerger received his BS (1979) and MS (1981) degrees from the University of Arizona and his Ph.D. (1991) from the University of Florida studying microbiology and plant pathology.  His dissertation studied the effects of temperature and pH on spore attachment of the fungal pathogen, Fusarium solani f. sp. phaseoli, to roots of mung bean plants grown in hydroponic systems.  Dr. Schuerger worked for 18 years (1982-2000) at The Land (a hydroponic research and education facility) at Epcot Center, FL developing disease management programs for viral, bacterial, fungal, and nematode diseases of vegetable and agronomic crops.  His research interests have closely paralleled NASA’s Advanced Life Support (ALS) and Astrobiology programs in which he has published numerous papers on plant-pathogen interactions in semi-closed plant growing systems, survival of terrestrial microorganisms under Martian conditions, and microbial ecology of human missions to Mars.  In 1997 Dr. Schuerger joined the Dynamac Corporation (a NASA contractor at the Kennedy Space Center, FL specializing in environmental and life sciences) to pursue research on the remote sensing of plant stress, Mars astrobiology, and ALS plant pathology issues.  In 2003 Dr. Schuerger joined the Dept. of Plant Pathology at the University of Florida as a Research Assistant Professor to continue his Mars astrobiology and ALS research activities. 
His current research efforts include (1) studying the effects of martian conditions on the survival, growth, and adaptation of terrestrial microorganisms; (2) investigating the UV-photolytic generation and destruction processes on Mars to convert accreted organics into atmospheric methane, a potential biosignature molecule in the martian atmosphere; and (3) developing a dust collection system called DART (Dust at Altitude Recovery Technology) to recover plant and human pathogens in African dust plumes that hit FL each year. 
His office and lab are located in the Space Life Sciences Lab, 505 Odyssey Way, Exploration Park, North Merritt Island, FL; adjacent to at the Kennedy Space Center, FL.

Top 8 Research Findings

  1. Tomato mosaic virus (ToMV) can be transported in hydroponic nutrient solutions (Schuerger & Hammer, 1995).
  2. Developed a successful biocontrol program for root-knot nematodes by the bacterium, Pasteuria penetrans (Serracin et al., 1997).
  3. Plants can grow at very low pressures (10% sea level) (Richards et al., 2006).
  4. Microorganisms on spacecraft are killed-off within 3 h on Mars (Schuerger et al., 2003; 2005; 2006; 2008).
  5. Filtration does not fully remove spores of fungal pathogens in hydroponic systems (Schuerger & Hammer, 2009).
  6. Methane on Mars (≥ 2 ppb) can be explained by the UV irradiation of meteoritic organics (Schuerger et al., 2011, 2012; Moores and Schuerger, 2012).
  7. Some terrestrial bacteria can grow under martian conditions of 7 mbar, 0 oC, and CO2 anoxic atmospheres (Schuerger et al., 2013; Nicholson et al., 2013).
  8. Asian dust does not appear to transport soilborne fungal pathogens to the USA (Schuerger et al., 2012; in preparation).


  • Berry, B. J., Jenkins, D. G., and Schuerger, A. C. 2010. Inhibition of Escherichia coli and Serratia liquefaciens under high-salt, low-pressure, and low-temperature environments that approach surface conditions on Mars. Appl. Environ. Micro. 76(8), 2377-2386. (download pdf)
  • Kerney, K. R., and Schuerger, A. C. 2011. Survival of Bacillus subtilis on sun-exposed spacecraft rover wheels and Mars regolith under simulated martian conditions. Astrobiology 11(5), 477-485. (download pdf)
  • Moores, J. E., and Schuerger, A. C. 2012. A meteoritic origin for the putative surface reservoir of organic carbon on Mars and relevance to the detection of methane in the martian atmosphere. JGR, Planets, 117(E08007), doi:10.1029/2012JE004060. (download pdf)
  • Nicholson, W. L., Fajardo-Cavazos, P., Fedenko, J., Ortiz-Lugo, J.-L., Rivas-Castillo, A., and Schuerger, A. C. 2010. Exploring the low-pressure growth limit: Laboratory evolution of Bacillus subtilis to enhanced growth at 5 kilopascals. Appl. Enviorn. Micro. 76(22), 7559-7565. (download pdf)
  • Schuerger, A. C., Capelle, G. A., De Benedetto, J. A., Mao, C., Thai, C. N., Evans, M. D., Richards, J., Blank, T., and Stryjewski, E. C. 2003. Comparison of two hyperspectral imaging and two laser-induced fluorescence instruments for the detection of zinc stress and chlorophyll concentration in bahia grass (Paspalum notatum Flugge.). Remote Sens. Environ. 84(4), 572-588. (download pdf)
  • Schuerger, A. C., Clausen, C., and Britt, D. 2011. Methane evolution from UV-irradiated spacecraft materials under simulated martian conditions: Implications for the Mars Science Laboratory (MSL) mission. Icarus 213, 393-403. (download pdf)
  • Schuerger, A. C., Farjardo-Cavazos, P., Clausen, C. A., Moores, J. E., Smith, P. H., and Nicholson, W.L. 2008. Slow degradation of ATP in simulated martian environments suggests long residence times for the biosignature molecule on spacecraft surfaces on Mars. Icarus 194(1), 86-100. (download pdf)
  • Schuerger, A. C., Golden, D. C., and Ming, D. W. 2012. Biotoxicity of Mars soils: 1. Dry deposition of analog soils on microbial colonies and survival under martian conditions. Planetary Space Science doi:10/1016/j.pss.2012.07.026. (download pdf)
  • Schuerger, A. C., and Hammer, W. 2009. Use of cartridge filtration to suppress root disease in hydroponic pepper plants caused by Pythium myriotylum. Phytopathology 99, 597-607. (download pdf)
  • Schuerger, A. C., and Hammer, W. 2003. Suppression of powdery mildew, Sphaerotheca fuliginea, on cucumber by the addition of silicon to hydroponic nutrient solutions. Plant Disease 87, 177-185. (download pdf)
  • Schuerger, A. C., Mancinelli, R. L., Kern, R.G., Rothschild, L. J., and McKay, C P. 2003.  Survival of endospores of Bacillus subtilis on spacecraft surfaces under simulated martian environments: Implications for the forward contamination of Mars. Icarus 165(2), 253-276. (download pdf)
  • Schuerger, A. C., Moores, J. E., Barlow, N., Clausen, C., and Britt, D. 2012. Methane evolution from UV-irradiated carbonaceous meteorites under simulated martian conditions. JGR, Planets 117(E08007), doi:10.1029/2011JE004023. (download pdf)
  • Schuerger, A. C., Trigwell, S., and Calle, C., 2008. Use of non-thermal atmospheric plasmas to reduce the viability of Bacillus subtilis on spacecraft surfaces. Intern. J. Astrobiol. 7(1), 47-57. (download pdf)
  • Smith, D. J., Griffin, D., and Schuerger, A. C. 2010. Stratospheric microbiology at 20 km over the Pacific Ocean. Aerobiologia 26, 35-46. (download pdf)
  • Young, H. M., George, S., Naváez, D. F., Srivastava, P., Schuerger, A. C., Wright, D. L., and Marois, J. J. 2012. Effect of solar irradiation on severity of soybean rust. Phytopathology 102, 794-803. (download pdf)