Geoff Zehnder

Professor of Entomology
Coordinator, IPM & Sustainable Agriculture Programs
Horticulture Program Team, Agricultural and Environmental Science Department, Plant and Environmental Sciences Department, Experiment Station

Office: 162 Poole
Phone: 864-933-6742
Personal Website:


 Educational Background

Ph.D. Entomology
UC Riverside 1984

M.S. Integrated Pest Management
UC Riverside 1981

B.S. Zoology
UC Davis 1980

 Courses Taught

HORT 4000; Sustainable Agriculture and Food Systems (seminar)
PES 4960; Creative Inquiry in Sustainable/Organic Agriculture


Geoff Zehnder directs the statewide Sustainable Agriculture and Integrated Pest Management Programs for Clemson University. These programs are stakeholder-driven and provide comprehensive training in sustainable/organic agriculture for farmers, Extension agents and other agriculture professionals. He also initiated and directs the Clemson University Student Organic Farm Project, a working certified organic farm on Clemson campus that serves as a resource for experiential learning in sustainable agriculture and organic farming.

 Research Interests

Current graduate student research projects focus on use of cover crops in no-till vegetable production for weed and soil quality management,alternative energy systems for season-extension greenhouse vegetable production, and black soldier fly composting systems. Previous research involved studies on induced systemic resistance in vegetables against insect transmitted diseases, application of electronic penetration graph techniques in studies of aphid host plant resistance, and development of alternative management strategies for insect pests of vegetables.

 Extension and Outreach

With support from Southern Region SARE Program, the Sustainable Agriculture Program provides statewide training in sustainable agriculture for farmers, Extension agents and other agriculture professionals. The training combines classroom instruction with in-field experience. The IPM Program is supported by the USDA NIFA Crop Protection and Pest Management program and provides training in environmentally sound pest management strategies for farmers and agriculture professionals.


Harrison, J., J. Gaskin, M. Harrison, J. Cannon, R. Boyer, and G. Zehnder. 2013. Survey of food safety practices on small to medium-sized farms and in farmers markets. J. Food
Protection. J. Food Protection. 76: 1989-1993.

Manyangarirwa, W*., G. W. Zehnder, G. S. McCutcheon, P. H. Adler, J. P. Smith and A.
N.Mphuru. 2011. The in vitro efficacy of a Zimbabwean isolate of Zoophthora radicans Brefeld (Batko) in the control of Lepidoptera larvae infesting Brassica sp. African Journal of Microbiology Res. Vol. 5: 1717-1722 .

Zehnder, G., G. Gurr, S. Keuhne, M. Wade, S. Wratten and E. Wyss. 2007. Arthropod
pest management in organic crops. Annual Review of Entomology, Vol. 52: 57-80.

Robertson, M., G. Zehnder and M. Hammig. 2005. Adoption of integrated pest
management practices by South Carolina cotton growers. Journal of Extension 43: (6)

Zehnder, Geoffrey W. 2005. Integrated Pest Management for Organic Systems: Moving
Towards a Higher Level of Integration. Organic Research. May, 1N-2N.

Aselage, J. and G. W. Zehnder. 2005. Industry perspective on research priorities for IPM
in organic crops for processing. Organic Research. May, 3N-7N. http//


Program webpage