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Lori A Hoagland

Horticulture and Landscape Architecture 

  • Associate Professor of Horticulture
Horticulture Room 314

Area of Expertise: Microbial Ecology of Horticultural Systems


Feeding the world’s growing population while dealing with soil and water degradation, rapidly evolving pests and increasing climatic instability will require innovative solutions. In the Hoagland lab, we integrate applied studies in specialty crop production with fundamental research in soil microbial ecology to address these challenges. The soil microbial community regulates many key agroecosystem services including nutrient cycling and biological mediation of biotic and abiotic stress. Understanding of how to manage these communities to improve crop performance and environmental health, however, is in its infancy. Our research is guided by two primary hypotheses: 1) the biochemical quality of soil amendments affects competition and niche partitioning among soil microbial taxa and can be manipulated to affect provision of key agroecosystem services; and, 2) composition of the plant microbiome is under genetic control and varieties can be developed to exploit soil biotic resources and increase yield, quality and safety of produce. Specific goals of our on-going projects include:

  • Improving nitrogen-use efficiency in low-input and organic production systems
  • Biologically controlling soil-borne and foliar pathogens
  • Mitigating drought and heavy metal stress
  • Identifying factors that affect colonization and survival of human pathogens
  • Developing improved tomato and carrot varieties
Details for two of our long-term projects aimed at managing foliar pathogens in tomato (TOMI) and improving productivity and quality in carrot (CIOA) can be found at the following websites:

Courses Taught:

  • HORT 20100 – Plant Propagation (2010-2014)
  • HORT 52500 – The Plant Microbiome (formerly HORT 49000 Rhizosphere Ecology) (2014-present)
  • SFS/HORT 31200 – Introduction to Urban Agriculture (2015-present)
  • SFS/HORT 49000 – Agroecosystem Analysis (new study abroad course in Colombia in summer 2018)


  • PhD, Soil Microbiology and Biochemistry, Washington State University
  • MS, Agroecology, University of Nebraska-Lincoln
  • BS, Environmental Science, University of Nebraska-Lincoln

Awards & Honors

(2015) Acorn Seed of Excellence Award. Purdue University.

(2015) Millionaire's Club Award.

(2011) International Travel Grant Award. Agriculture Research Program, Purdue University.

(2011) Acorn Seed of Excellence Award. Purdue University.

(2011) Millionaire’s Club Award. Purdue University.

Selected Publications

Ximenes, E. A., Hoagland, L. A., Ku, S., & Ladisch, M. R. (2017). Human pathogens in biofilms: formation, physiology and detection. Biotechnology and Bioengineering. doi:10.1002/bit.26247

Simon, P., Navazio, J., Colley, M., Hoagland, L. A., Roberts, P., DuToit, L., . . . McCluskey, C. (2017). The CIOA Project: Location, cropping system, and genetic background influence carrot performance including top height and flavor. Acta Horticulturacea. doi:https://doi.org/10.17660/ActaHortic.2017.1153.1

Hallett, S. G., Hoagland, L. A., & Toner, E. (2016). Urban agriculture: environmental, economic and social perspectives. Horticulture Reviews, 44, 65-109.

Reeve, J., Hoagland, L. A., Villalba, J., Carr, P., Attucha, A., Cambardella, C., . . . Davis (2016). Organic farming, soil health, and food quality: Considering possible linkages. Advances in Agronomy, 137, 1-49.

Shoaf, N., Egel, D. S., & Hoagland, L. A. (2016). Suppression of Phytophthora blight in sweet pepper depends on biochar amendment and soil type. Hortscience, 51(5), 518-524.

Rudisill, M., Turco, R. F., & Hoagland, L. A. (2016). Rhizosphere effects and fertility management influence nitrification and ammonia oxidizers in intensively managed vegetable production systems. Applied Soil Ecology, 99, 70-77.

Hoagland, L. A. (2015). Breeding for beneficial plant-microbial relationships: how do we get there? Eucarpia Workshop On Implementing Plant-Microbe interaction in Plant Breeding,, 23-24.

Rudisill, M., Turco, R. F., & Hoagland, L. A. (2015). Sustaining soil quality in intensively managed high tunnel vegetable production systems; a role for green manures and chicken litter. Hortscience, 50(3), 461-468.

Hoagland, L. A., Navazio, J., Zystro, F., Kaiser, J. L., Gomez-Vargas, J., & Gibson, K. D. (2015). Identification of key traits and adapted germplasm for an organic participatory tomato breeding program for the Midwest U.S. Hortscience, 50(9), 461-468.

DuToit, L., Derie, M., Christianson, C., Hoagland, L., & Simon, P. (2014). First Report of Bacterial Blight of Carrot in Indiana Caused by Xanthomonas hortorum pv. carotae. Plant Disease.

Horticulture & Landscape Architecture, 625 Agriculture Mall Drive, West Lafayette, IN 47907-2010 USA, (765) 494-1300

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