Ghana 1 268 (1)


Carrie is studying the socio-economic aspects of Huanglongbing, (Citrus Greening), a serious citrus disease that was recently found in California and has devastated the Florida citrus industry. She has an extensive background working with farmers domestically and internationally, at the USDA, as Peace Corps volunteer in Ghana, and on projects in Liberia and Uganda.


B.A. University of Wisconsin – Madison, Anthropology and Environmental Science

M.S. University of California – Davis, International Agricultural Development

M.S. University of California – Davis, Plant Pathology (2016)

Area of Specialization:

Plant disease epidemiology; systems modelling and analysis; integrated pest management


My research focuses on the the socio-economic aspects of Huanglongbing, (HLB/Citrus Greening). HLB is the biggest threat to international citrus production. The disease affects all citrus varieties and there is no cure. In the U.S., the disease is caused by the bacteria Candidatus Liberibacter asiaticus, which is vectored by the Asian citrus psyllid (ACP), Diaphorina citri.

The ACP was detected in California in 2008 and HLB was found in March 2012 in Los Angeles County, which means it is now even more important to keep the psyllid populations low. But, traditional management options are not very effective and tend to lead to dramatic increases in pesticide use, so sustainability may be tied to adoption of biotechnology solutions. My project is concerned with mapping out this dilemma and studying the dynamics of the disease and human response.


Teiken, C., B. Grafton-Cardwell, P. Lemaux, and N. McRoberts. 2015. Using Genetic Engineering to Protect Citrus from Huanglongbing. Citrograph 6(1): 24-31.

Bell, M., A.B. Bohn, C. Teiken, N. Madden, E. Peach-Fine, J. Schweiger, and J. Shuck. 2013. Rapid Appraisal of the ICT for Agricultural Extension Landscape in Ghana. USAID Monitoring Extension and Advisory Services (MEAS) Publication: 1-62.