Selected papers from our research aimed at supporting development


Bold = Member of Garrett Lab / Underline = Other scientist mentored by Garrett / Asterisk = *Equivalent contributions

Buddenhagen*, C. E.Y. Xing*, J. Andrade Piedra, G. A. Forbes, P. Kromann, I. Navarrete, S. Thomas-Sharma, R. A. ChoudhuryK. F. Andersen, E. Schulte-Geldermann, B. A. EthertonA. I. Plex Sulá, and K. A. Garrett. 2022. Where to invest project efforts for greater benefit: A framework for management performance mapping with examples for potato seed health. Phytopathology. [open access link]

Garrett, K. A., D. P. Bebber, B. A. Etherton, K. M. Gold, A. I. Plex Sulá, and M. G. Selvaraj. 2022. Climate change effects on pathogen emergence: artificial intelligence to translate big data for mitigation.  Annual Review of Phytopathology, in press.

Navarrete, I., V. López, R. Borja, P. Oyarzún, K. A. Garrett, C. J. M. Almekinders, Y. Xing, P. C. Struik, J. L. Andrade-Piedra. 2022. Variety and on-farm seed management practices affect potato seed degeneration in the tropical highlands of Ecuador. Agricultural Systems 198:103387. [open access link]

Sharma, K., F. Iruegas-Bocardo, A. Abdurahman, R. I. Alcalá-BriseñoK. A. Garrett, E. M. Goss, G. Ngundo, J. Kreuze, and F. Munguti. 2022. The potato bacterial wilt pathogen exhibits high diversity and epidemic clonality of phylotype II sequevar 1 strains in Kenya. Phytopathology, accepted pending minor revision.

Andersen Onofre, K. F., G. A. Forbes, J. Andrade-Piedra, C. E. Buddenhagen, J. C. Fulton, M. Gatto, Z. Khidesheli, R. Mdivani, Y. XingK. A. Garrett. 2021. An integrated seed health strategy and phytosanitary risk assessment: potato in the Republic of Georgia. Agricultural Systems 191:103144. [open access link]

Garrett, K. A. 2021. Impact network analysis and the INA R package: Decision support for regional management interventions. Methods in Ecology and Evolution 12:1634-1647. [open access link]

McEwan, M. A., C. J. M. Almekinders, J.L. Andrade-Piedra, E. Delaquis, K. A. Garrett, L. Kumar, S. Mayanja, B. A. Omondi, S. Rajendran, and G. Thiele. 2021. “Breaking through the 40% adoption ceiling: Mind the seed system gaps.” A perspective on seed systems research for development in One CGIAR. Outlook on Agriculture [open access link]

Alcalá-Briseño, R. I., K. Casarrubias-Castillo, D. López-Ley, K. A. Garrett, L. Silva-Rosales. 2020. Network analysis of the papaya orchard virome from two agroecological regions of Chiapas, Mexico. mSystems 5:e00423-19. [open access link]

Fayette, J., S. Bec, S. Loubeau, J. C. Fulton, K. A. Garrett, and C. L. Harmon. 2020. First report of Lasiodiplodia hormozganensis causing fruit rot of eggplant in Haiti. [Disease Note] Plant Disease 104:592 [open access link]

Fulton, J. C., S. Bec, J. Fayette, R. C. Ploetz, K. A. Garrett, C. L. Harmon. 2020. First report of plantain soft rot caused by Klebsiella variicola in Haiti. [Disease Note] Plant Disease [open access link]

Garrett, K. A.R. I. Alcalá-BriseñoK. F. Andersen, J. Brawner, R. A. Choudhury, E. Delaquis, J. Fayette, R. Poudel, D. Purves, J. Rothschild, I. M. Small, S. Thomas-Sharma, and Y. Xing.  2020.  Effective altruism as an ethical lens on research priorities.  Phytopathology. [open access link]

Xing*, Y.J. Hernandez Nopsa*, K. F. Andersen, J. Andrade-Piedra, F. Beed, G. Blomme, M. Carvajal Yepes, D. Coyne, W. Cuellar, G. Forbes, J. Kreuze, J. Kroschel, L. Kumar, J. Legg, M. Parker, E. Schulte-Geldermann, K. Sharma, and K. A. Garrett. 2020. Global cropland connectivity: A risk factor for invasion and saturation by emerging pathogens and pests. BioScience 70:744-758. [open access link]

Andersen, K. F.C. E. Buddenhagen, P. Rachkara, R. Gibson, S. Kalule, D. Phillips, and K. A. Garrett. 2019. Modeling epidemics in seed systems and landscapes to guide management strategies: The case of sweetpotato in Northern Uganda. Phytopathology 109:1519-1532.  [open access link]

Bell, T. H., K. Hockett, R. I. Alcalá-Briseño, M. Barbercheck, G. A. Beattie, M. A. Bruns, J. Carlson, T. Chung, A. Collins, B. Emmett, P. Esker, K. A. Garrett, L. Glenna, B. K. Gugino, M. d. M. Jimenez Gasco, L. Kinkel, J. Kovac, K. Kowalski, G. Kuldau, J. Leveau, M. Michalska-Smith, J. Myrick, K. Peter, M. V. Salazar, A. Shade, N. Stopnisek, X. Tan, A. Welty, K. Wickings, and E. Yergeau. 2019. Manipulating wild and tamed phytobiomes: challenges and opportunities. Phytobiomes 3:3-21. [open access link]

Carvajal-Yepes, M., K. Cardwell, A. Nelson, K. A. Garrett, B. Giovani, D. G. O. Saunders, S. Kamoun, J. P. Legg, V. Verdier, J. Lessel, R. A. Neher, R. Day, P. Pardey, M. L. Gullino, A. R. Records, B. Bextine, J. E. Leach, S. Staiger, J. Tohme. 2019. A global surveillance system for crop diseases. Science 364:1237-1239. [link]

Ogero, K., J. Kreuze, M. McEwan, N. Luambano, H. Bachwenkizi, K. A. GarrettK. F. Andersen, S. Thomas-Sharma, and R. A. A. van der Vlugt.  2019.  Efficiency of insect-proof net tunnels in reducing virus-related seed degeneration in sweetpotato. Plant Pathology 68:1472-1480. [open access link]

Asche, F., T. M. Garlock, J. L. Anderson, S. R. Bush, M. D. Smith, C. M. Anderson, J. Chu, K. A. Garrett, A. Lem, K. Lorenzen, A. Oglend, S. Tveteras, and S. Vannuccini. 2018. Three pillars of sustainability in fisheries. Proceedings of the National Academy of Sciences  [link]

Delaquis, E., K. F. Andersen, N. Minato, C. T. L. Thuy, M. E. Karssenberg, S. Sophearith, K. A. G. Wyckhuys, J. Newby, D. D. Burra, P. Srean, I. Phirun, L. D. Niem, P. T. Nhan, K. A. Garrett, C. J. M. Almekinders, P. C. Struik, S. de Haan. 2018. Raising the stakes: cassava seed networks at multiple scales in Cambodia and Vietnam.  Frontiers in Sustainable Food Systems 2:73. [open access link]

Garrett, K. A., R. I. Alcalá-Briseño, K. F. Andersen, C. E. Buddenhagen, R. A. Choudhury, J. C. Fulton, J. F. Hernandez Nopsa, R. Poudel, and Y. Xing. 2018. Network analysis: A systems framework to address grand challenges in plant pathology.  Annual Review of Phytopathology 56: 559-580. [open access link]

Savary, S., A. D. Nelson, A. Djurle, P. D. Esker, A. Sparks, L. Amorim, A. Bergamin Filho, T. Caffi, N. Castilla, and K. Garrett. 2018. Concepts, approaches, and avenues for modelling crop health and crop losses. European Journal of Agronomy 100:4-18. [link]

Ziska, L.H., B. A. Bradley, R. D. Wallace, C. T. Bargeron, J. H. LaForest, R. A. ChoudhuryK. A. Garrett, F. E. Vega. 2018. Climate change, carbon dioxide, and pest biology, managing the future: Coffee as a case study. Agronomy 8:152. [open access link]

Buddenhagen*C. E.,  J. F. Hernandez Nopsa*K. F. Andersen, J. Andrade-Piedra, G. A. Forbes, P. Kromann, S. Thomas-Sharma, P. Useche, and K. A. Garrett. 2017. Epidemic network analysis for mitigation of invasive pathogens in seed systems: Potato in Ecuador.  Phytopathology 107:1209-1218. [open access link]

Choudhury, R. A.K. A. Garrett, S. J. Klosterman, K. V. Subbarao, and N. McRoberts.  2017.  A framework for optimizing phytosanitary thresholds in seed systems. Phytopathology 107:1219-1228. [link]

Garrett, K. A.K. F. Andersen, F. Asche, R. L. Bowden, G. A. Forbes, P. A. Kulakow, and B. Zhou. 2017. Resistance genes in global crop breeding networks. Phytopathology 107:1268-1278. [open access link] [interactive interface for exploring model behavior]

Hilker, F. M., L. J. S. Allen, V. A. Bokil, C. J. Briggs, Z. Feng, K. A. Garrett, L. J. Gross, F. M. Hamelin, M. J. Jeger, C. A. Manore, A. G. Power, M. G. Redinbaugh, M. A. Rúa and N. J. Cunniffe.  2017. Modelling virus coinfection to inform management of maize lethal necrosis in Kenya.  Phytopathology 107:1095-1108. [open access link] [in the news]

Hondrade*, R. F., E. Hondrade*L. Zheng*, F. Elazegui, J. Duque, C. C. Mundt, C. M. Vera Cruz, and K. A. Garrett. 2017. Cropping system diversification for food production in Mindanao rubber plantations: A rice cultivar mixture and rice intercropped with mungbean. PeerJ 5:e2975. [open access link]

Savary, S., S. Bregaglio, L. Willocquet, D. Gustafson, D. M. D’Croz, A. Sparks, N. Castilla, A. Djurle, C. Allinne, M. Sharma, V. Rossi, L. Amorim, A. Bergamin, J. Yuen, P. Esker, N. McRoberts, J. Avelino, E. Duveiller, J. Koo, and K. Garrett. 2017. Crop health and its global impacts on the components of food security. Food Security 9:311–327. [link]

Thomas-Sharma, S., J. Andrade-Piedra, M. Carvajal Yepes, J. Hernandez Nopsa, M. Jeger, R. Jones, P. Kromann, J. Legg, J. Yuen, G. A. Forbes, and K. A. Garrett. 2017. A risk assessment framework for seed degeneration: Informing an integrated seed health strategy for vegetatively-propagated crops. Phytopathology 107:1123-1135. [open access link]  [Interactive interface for exploring model behavior]

Poudel, R., A. Jumpponen, D. C. Schlatter, T. C. Paulitz, B. McSpadden Gardener, L. L. Kinkel, and K. A. Garrett.  2016.  Microbiome networks: A systems framework for identifying candidate microbial assemblages for disease management.  Phytopathology 106:1083-1096. [open access link]

Thomas-Sharma, S., A. Abdurahman, S. Ali, J. L. Andrade-Piedra, S. Bao, A. O. Charkowski, D. Crook, M. Kadian, P. Kromann, P. C. Struik, L. Torrance, K. A. Garrett, and G. A. Forbes. 2016. Seed degeneration in potato: the need for an integrated seed health strategy to mitigate the problem in developing countries.  Plant Pathology 65:3-16. [link] [CGIAR press release]


Alexander, H. M., K. E. Mauck, A. E. Whitfield, K. A. Garrett, and C. M. Malmstrom. 2014. Plant-virus interactions and the agro-ecological interface. European Journal of Plant Pathology 138:529-547. [link]

Sparks, A. H., G. A. Forbes, R. J. Hijmans, and K. A. Garrett. 2014. Climate change may have limited effect on the global risk of potato late blight. Global Change Biology 20:3621-3631. [link]

Garrett, K. A. 2013. Big data insights into pest spread [invited commentary]. Nature Climate Change 3:955-957. [link]

Garrett, K. A., A. Dobson, J. Kroschel, B. Natarajan, S. Orlandini, H. E. Z. Tonnang, and C. Valdivia. 2013. The effects of climate variability and the color of weather time series on agricultural diseases and pests, and decision making for their management. Agricultural and Forest Meteorology 170:216-227. [link]

Gomez-Montano, L., A. Jumpponen, M. A. Gonzales, J. Cusicanqui, C. Valdivia, P. Motavalli, M. Herman, and K. A. Garrett. 2013. Do bacterial and fungal communities in soils of the Bolivian Altiplano change under shorter fallow periods? Soil Biology & Biochemistry 65:50-59. [link] [Supplemental materials, including beautiful photos] [Associated R scripts]


Garrett, K. A. 2012. Information networks for plant disease: Commonalities in human management networks and within-host signaling networks. [Invited] European Journal of Plant Pathology 133:75-88. [link]

Garrett, K. A., G. A. Forbes, S. Savary, P. SkelseyA. H. Sparks, C. Valdivia, A. H. C. van Bruggen, L. Willocquet, A. Djurle, E. Duveiller, H. Eckersten, S. Pande, C. Vera Cruz, and J. Yuen. 2011. Complexity in climate change impacts: A framework for analysis of effects mediated by plant disease. Plant Pathology 60:15-30. [link]

Savary, S., A. Nelson, A. H. Sparks, L. Willocquet, E. Duveiller, G. Mahuku, G. Forbes, K. A. Garrett, D. Hodson, J. Padgham, S. Pande, M. Sharma, J. Yuen, A. Djurle. 2011. International agricultural research tackling the effects of global and climate changes on plant diseases in the developing world. Plant Disease 95:1204-1216. [open access link]

Sparks, A. H., G. A. Forbes, R. J. Hijmans, and K. A. Garrett. 2011. A metamodeling framework for extending the application domain of process-based ecological models. Ecosphere 2:art90. [open access link]

Perez, P., C. Nicklin, O. Dangles, S. Vanek, S. Sherwood, S. Halloy, K. Garrett, and G. Forbes. 2010. Climate change in the High Andes: Implications and adaptation strategies for small-scale farmers. The International Journal of Environmental, Cultural, Economic and Social Sustainability 6:71-88. [link]



Cheatham, M. R.*, M. N. Rouse*P. D. Esker, S. Ignacio, W. Pradel, R. Raymundo, A. H. Sparks, G. A. Forbes, T. R. Gordon, and K. A. Garrett. 2009. Beyond yield: Plant disease in the context of ecosystem services. Phytopathology 99:1228-1236. [open access link]

Garrett, K. A., L. N. Zúñiga, E. Roncal, G. A. Forbes, C. C. Mundt, Z. Su, and R. J. Nelson. 2009. Intraspecific functional diversity in hosts and its effect on disease risk across a climatic gradient. Ecological Applications 19:1868-1883. [link]


Chakraborty, S., J. Luck, G. Hollaway, A. Freeman, R. Norton, K. A. Garrett, K. Percy, A. Hopkins, C. Davis, and D. F. Karnosky. 2008. Impacts of global change on diseases of agricultural crops and forest trees. CAB Reviews: Perspectives in Agriculture, Veterinary Science, Nutrition and Natural Resources 3, No. 054.

Bockus, W. W., Z. SuK. A. Garrett, B. S. Gill, J. P. Stack, R. L. Bowden, A. K. Fritz, K. L. Roozeboom, and T. J. Martin. 2007. Number of experiments needed to determine wheat disease phenotypes for four wheat diseases. Plant Disease 91:103-108. [open access link]

Garrett, K. A.S. P. DendyE. E. FrankM. N. Rouse, and S. E. Travers. 2006. Climate change effects on plant disease: Genomes to ecosystems. Annual Review of Phytopathology 44:489-509. [link]

Jiang, W.K. A. Garrett, D. E. Peterson, T. L. Harvey, R. L. Bowden, and L. Fang. 2005. The window of risk for emigration of Wheat streak mosaic virus varies with host eradication method. Plant Disease 89:853-858. [open access link]

Cox, C. M.K. A. Garrett, R. L. Bowden, A. K. Fritz, S. P. Dendy, and W. F. Heer. 2004. Cultivar mixtures for the simultaneous management of multiple diseases: Tan spot and leaf rust of wheat. Phytopathology 94:961-969. [open access link]

Ortiz, O., K. A. GarrettJ. J. Heath, R. Orrego, and R. J. Nelson. 2004. Management of potato late blight in the Andean highlands: Evaluating the benefits of Farmer Participatory Research and Farmer Field Schools. Plant Disease 88:565-571. [open access link]

Rosenberg, M. S., K. A. GarrettZ. Su, and R. L. Bowden. 2004. Meta-analysis in plant pathology: Methods for research synthesis. Phytopathology 94:1013-1017. [open access link]

Mundt, C. C., C. Cowger, and K. A. Garrett. 2002. Relevance of integrated disease management to resistance durability. Euphytica 124:245-252. [link]

Garrett, K. A., R. J. Nelson, C. C. Mundt, G. Chacón, R. E. Jaramillo, and G. A. Forbes. 2001. The effects of host diversity and other management components on epidemics of potato late blight in the humid highland tropics. Phytopathology 91:993-1000. [open access link]

Hijmans, R. J., K. A. Garrett, Z. Huamán, D. P. Zhang, M. Schreuder, and M. Bonierbale. 2000. Assessing the geographic representativeness of germplasm collections: the case of the Bolivian wild potato genebank. Conservation Biology 14:1755-1765. [link]

Garrett, K. A., and C. C. Mundt. 1999. Epidemiology in diverse host populations. Phytopathology 89:984-990. [open access link]

Garrett, K. A. 1997. Use of statistical tests of equivalence (bioequivalence tests) in plant pathology. Phytopathology 87:372-374. [open access link]



Rosegrant, M. W., J. Koo, N. Cenacchi, C. Ringler, R. Robertson, M. Fisher, C. Cox, K. Garrett, N. D. Perez, and P. Sabbagh. 2014. Food Security in a World of Natural Resource Scarcity. International Food Policy Research Institute, Washington, DC.

BOOK CHAPTERS and user guides

Garrett, K. A. 2021. User guide to impact network analysis (INA). CGIAR Research Program on Roots, Tubers and Bananas (RTB). RTB User Guide. No. 2021-4. Lima, Peru. [open access link]

Garrett, K.A., and Y. Xing. 2021. User guide to the seedHealth model as part of the integrated seed health approach.CGIAR Research Program on Roots, Tubers and Bananas (RTB). RTB User Guide. No. 2021-5. Lima, Peru. [open access link]

Andrade-Piedra, J. L., C. J. M. Almekinders, M. A. McEwan, F. B. M. Kilwinger, S. Mayanja, L. Mulugo, E. Delaquis, K.A. Garrett, A. B. Omondi, S. Rajendran, P. L. Kumar and G. Thiele. 2020. User guide to the toolbox for working with root, tuber and banana seed systems. CGIAR Research Program on Roots, Tubers and Bananas (RTB), Lima, Peru. [open access link]

Garrett, K. A.R. I. Alcalá-BriseñoK. F. AndersenR. A. ChoudhuryW. DantesJ. FayetteJ. C. FultonR. Poudel, and C. G. Staub. 2019. Adapting disease management systems under global change. In: J. Ristaino and A. Records (Editors), Emerging Plant Diseases and Global Food Security. APS Press, in press.

Beed, F., A. Benedetti, G. Cardinali, S. Chakraborty, T. Dubois, K. Garrett and M. Halewood. 2015. Climate change and micro-organism genetic resources for food and agriculture: State of knowledge, risks and opportunities. In Food and Agriculture Organization of the United Nations, and available at

Garrett, K. A.S. Thomas-Sharma, G. A. Forbes, and J. Hernandez Nopsa. 2014. Climate change and plant pathogen invasions. In Invasive Species and Climate Change. L. Ziska and J. Dukes, eds. CABI Publishing.

Hernandez Nopsa, J.S. Thomas-Sharma, and Garrett, K. A. 2014. Climate change and plant disease. In Encyclopedia of Agriculture and Food Systems. N. Van Alfen, ed. Elsevier.

Porter, J. R., L. Xie (Coordinating Lead Authors); A. Challinor, K. Cochrane, M. Howden, M. M. Iqbal, D. Lobell, M. I. Travasso (Lead Authors); N. Chhetri, K. Garrett, J. Ingram, L. Lipper, N. McCarthy, J. McGrath, D. Smith, P. Thornton, J. Watson, L. Ziska (Contributing Authors); P. Aggarwal, K. Hakala (Review Editors); J. Jordan (Volunteer Chapter Scientist). 2014. IPCC WGII AR5 Chapter 7. Food Security and Food Production Systems.

Ringler, C., N. Cenacchi, J. Koo, R. Robertson, M. Fisher, C. Cox, N. Perez, K. Garrett, and M. Rosegrant. 2014. Sustainable Agricultural Intensification: The Promise of Innovative Farming Practices. Pages 43-51 in 2013 Global Food Policy Report. International Food Policy Research Institute, Washington, DC.

Garrett, K. A., G. A. Forbes, L. Gomez, M. A. Gonzales, M. Gray, P. Skelsey, and A. H. Sparks. 2013. Cambio climático, enfermedades de las plantas e insectos plaga. Pages 71-98 in Cambio climático en los Andes. E. Jimenez, ed.

Beed, F., A. Benedetti, G. Cardinali, S. Chakraborty, T. Dubois, K. Garrett and M. Halewood. 2011. Climate change and micro-organism genetic resources for food and agriculture: State of knowledge, risks and opportunities. Food and Agriculture Organization of the United Nations. , and available at

Garrett, K. A., A. Jumpponen, and L. Gomez Montano. 2010. Emerging plant diseases: What are our best strategies for management? Pages 152-160 in Controversies in Science and Technology, Vol. 3, From Evolution to Energy. Editors E. L. Kleinman, J. A. Delborne, K. A. Cloud-Hansen, and J. Handelsman. Liebert Publishers, New Rochelle, New York.

Garrett, K. A.M. Nita, E. D. De Wolf, L. Gomez, and A. H. Sparks. 2009. Plant pathogens as indicators of climate change. Pages 425-437 in Climate and Global Change: Observed Impacts on Planet Earth. T. Letcher, editor. Elsevier.

Garrett, K. A. 2008. Climate change and plant disease risk. Pages 143-155 in Global Climate Change and Extreme Weather Events: Understanding the Contributions to Infectious Disease Emergence. National Academies Press, Washington, D.C.

Garrett, K. A. and C. M. Cox. 2008. Applied biodiversity science: Managing emerging diseases in agriculture and linked natural systems using ecological principles. Pages 368-386 in Infectious Disease Ecology: Effects of Ecosystems on Disease and of Disease on Ecosystems. R. Ostfeld, F. Keesing, and V. Eviner, editors. Princeton University Press.

Garrett, K. A. and S. P. Dendy. 2002. Prácticas culturales para el manejo del tizón tardío de la papa. [Cultural practices for late blight management.] Pages 111-120 in Complementando la Resistencia al Tizón (Phytophthora infestans) en los Andes. E. N. Fernández-Northcote, editor. Global Initiative for Late Blight, Lima, Peru.