Selected papers from the lab related to potato and sweetpotato systems, some as part of the CGIAR Research Program on Roots Tubers and Bananas.

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 112:1431-1443. [open access link]

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 [link].

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]

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 50:5-12. [open access link]

Narouei-Khandan, H. A., S. K. Shakya, S.K., K. A. Garrett, E. M. Goss, N. S. Dufault, J. L. Andrade-Piedra, S. Asseng, D. Wallach, A. H. van Bruggen, A.H. 2020. BLIGHTSIM: A new potato late blight model simulating the response of Phytophthora infestans to diurnal temperature and humidity fluctuations in relation to climate change. Pathogens 9:659. [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]

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]

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]

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]

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]

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 research and development strategy to mitigate the problem in developing countries.  Plant Pathology 65:3-16. [link] [CGIAR press release]

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]

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., G. A. Forbes, S. Savary, P. Skelsey, A. 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]

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]

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]

Ortiz, O., K. A. Garrett, J. 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]

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]

Garrett, K. A., and C. C. Mundt. 2000. Host diversity can reduce potato late blight severity for focal and general patterns of primary inoculum. Phytopathology 90:1307-1312. [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 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.