Faculty

Gevens, Amanda - Current Faculty Profile
Amanda Gevens
Assistant Professor
608-890-3072
608-263-2626

689 Russell Laboratories
1630 Linden Dr
Madison, WI 53706

Faculty Profile Tab

PhD: Michigan State University in Plant Pathology

MS:  Purdue University in Plant Pathology

My research program investigates the ecology of fungus and fungus-like plant pathogens for enhanced and integrated disease management.  Specifically, we investigate Phytophthora species pathogenic on potato and vegetable crops in field and storage.  My program conducts research on P. infestans, P. capsici, and P. erythroseptica to determine pathogen genotypes/races/clonal lineages, mating types, host range, virulence, survivability, and resistance to commonly utilized fungicides.  Improved understanding of pathogen characters has promptly influenced statewide recommendations for Phytophthora disease management in Wisconsin production of potatoes and vegetables.        

A second program emphasis is on species distribution and occurrence of pathogenic Alternaria affecting potato.  Preliminary studies confirmed the presence of A. alternata in late season epidemics of early blight in northern Wisconsin.  Speciation of Alternaria throughout the production season at several regions of concentrated potato production in Wisconsin is being undertaken to further characterize the pathogen profile.  Additionally, sub-populations of Alternaria spp. collected from potatoes were partially resistant to the commonly-used fungicide active ingredient, azoxystrobin.  Mechanisms of fungicide resistance can differ between species.  As such, species determination may aid in regional or field-level tailoring of fungicide programs for enhanced disease control.  Early blight, caused by A. solani, is present every year in Wisconsin and can, if unmanaged, cause significant yield loss and reduction in tuber quality.   The importance and incidence of brown spot, caused by A. alternata, is poorly understood in Wisconsin at this time.  Our research addresses efficacy of novel fungicides and fungicide programs for more immediate application and support of grower needs, as well exploring pathogen ecological factors which may influence longer term disease management solutions.   

A final area of research emphasis is the investigation of component inputs and development of integrated disease management programming in potato systems to reduce reliance upon soil fumigation in managing key soilborne diseases.  Our research approaches have included evaluation of disease control with reduced rates, alternative formulations, and in-line versus broadcast applications of soil fumigants such as chloropicrin and metam sodium to reduce quantity of soil-applied chemical.  Preliminary work suggests similar efficacy of some in-line-applied fumigants compared to broad-cast fumigants, offering a reduction in chemical use, and off-target and negative environmental and human health effects.   At-plant applications of nematicidal and fungicidal materials, potato vine removal, crop rotations, and cover crops have also been investigated with some positive preliminary results.  Soilborne diseases of potato such as potato early dying and common scab are especially challenging to manage and our research in this area of fumigation alternatives has been of great interest in regional industry and in academic circles.

As the UW-Extension Potato and Vegetable Pathologist, my program supports vegetable growers by providing research-based recommendations for controlling diseases during production and in storage.  My research program directly feeds into my extension work.  For more information about the vegetable extension program please visit the UW Vegetable Pathology website. 

Along with a team of UW vegetable production scientists across departments, I extend knowledge through grower educational meetings, through our UW Vegetable Crop Updates Newsletter distributed online & by email, through direct email or phone consultations, and through one-on-one visits and discussion.  The connections between researchers and growers are strong in WI, with growers providing extensive intellectual and farm resources in contribution to world-class applied and basic agricultural research. Our Wisconsin Vegetable Team website is:  http://vegetables.wisc.edu/vegetable-team

  • PLP 875 Agricultural Oomycetes, Spring 2011

Jordan, S.A., Caine, D., Gevens, A.J.  2014.  Evaluation of fungicides to control white mold in snap beans, Hancock, 2013.  Plant Disease Management Reports.  8:V245. Online publication.

Jordan, S.A., Cleveland, K.M., Gevens, A.J.  2014.  Evaluation of foliar fungicides for control of potato early blight in Wisconsin, 2013.  Plant Disease Management Reports.  8:V246.  Online publication. 

Jordan, S.A., Gevens, A.J.  2014.  Evaluation of seed treatment and in-furrow treatments for control of silver scurf of potato in Wisconsin, 2013.  Plant Disease Management Reports.  8:ST021.  Online publication.

Jordan, S.A., Gevens, A.J.  2014.  Evaluation of seed, in-furrow, and foliar treatments for control of Rhizoctonia diseases of potato in Wisconsin, 2013.  Plant Disease Management Reports.  8:ST022.  Online publication.

Jordan, S.A., Webster, B.J., Plaster, S., Gevens, A.J.  2014.  Evaluating seed treatment and in-furrow treatments for control of potato common scab in Wisconsin, 2013.  Plant Disease Management Reports.  8:ST020.  Online publication. 

Seidl, A.C., Gevens, A.J.  2014. Novel resistance in heirloom tomatoes and effectiveness of resistance in hybrids to Phytophthora infestans US-22, US-23, and US-24 clonal lineages.  Plant Disease 98:761-765.  

Seidl, A.C., Gevens, A.J.  2014. Investigating the host range of the US-22, US-23, and US-24 clonal lineages of Phytophthora infestans on solanaceous cultivated plants and weeds.  Plant Disease 98:754-760.

Jordan, S.A., Gevens, A.J.  2013.  Evaluation of Stadium fungicide with chlorpropham (CIPC) for control of late blight of potato in storage, 2012-2013.  Plant Disease Management Reports.  7:V154.  Online publication.

Jordan, S.A., Gevens, A.J.  2013.  Evaluation of fungicides for control of late blight in potato in storage, 2012-2013.  Plant Disease Management Reports.  7:V151.  Online publication.  

Jordan, S.A., Gevens, A.J.  2013.  Evaluation of fungicides for control of potato pink rot in storage – Hancock, 2012-2013.  Plant Disease Management Reports.  7:V150.  Online publication.  

Jordan, S.A., Cleveland, K.M., Gevens, A.J.  2013.  Evaluation of foliar fungicides for control of potato early blight in Wisconsin, 2012.  Plant Disease Management Reports.  7:V152.  Online publication.  

Jordan, S.A., Gevens, A.J.  2013.  Evaluation of at-plant treatments for control of Rhizoctonia disease of potato in Wisconsin, 2012.  Plant Disease Management Reports.  7:V153.  Online publication.  doi:10.1094/PDMR07.

Jordan, S.A., Gevens, A.J.  2013.  Evaluation of fungicide treatments and application schedule on foliar blight of carrot, 2012.  Plant Disease Management Reports.  7:V099.  Online publication.  doi:10.1094/PDMR07. 

Jordan, S.A., Gevens, A.J.  2013.    Evaluation of fungicides for control of late blight in potato tubers in storage, 2011-2012.  Plant Disease Management Reports.  7:V071.  Online publication. 

Jordan, S.A., Gevens, A.J.  2013.  Evaluation of fungicides for control of pink rot in potato storage - Hancock, 2010-2011.  Plant Disease Management Reports.  7:V070.  Online publication.     

Webster, B.J., Jordan, S.A., Gevens, A.J.  2013.  Evaluation of ozone and post-harvest treatments to control silver scurf spread on potato tubers in storage, 2012.  7:V069.  Online publication.  

Seidl, A.C., Gevens, A.J.  2013.  Characterization and distribution of three new clonal lineages of Phytophthora infestans causing late blight in Wisconsin from 2009 to 2012.  American Journal of Potato Research 90:551-560. 

Gevens, A.J.,Seidl, A.C.  2013.  First Report of Late Blight Caused by Phytophthora infestans Clonal Lineage US-24 on Potato (Solanum tuberosum) in Wisconsin.  Plant Disease 97(3):152. 

Gevens, A.J., Seidl, A.C.  2012.  First Report of late blight caused by Phytophthora infestans clonal lineage US-22 on tomato and potato in Wisconsin.  Plant Disease.  97(3): 423. 

Gevens, A.J., Seidl, A.C.  2012.  First Report of Late Blight caused by Phytophthora infestans Clonal Lineage US-23 on Tomato and Potato in Wisconsin, United States.  Plant Disease 97:839.

W. E. Fry, M. T. McGrath, A. Seaman, T. A. Zitter, A. McLeod, G. Danies, I. Small, K. Myers, K. Everts, A. J. Gevens, B. Gugino, S. Johnson, H. Judelson, J. Ristaino, P. Roberts, G. Secor, K. Seebold, K. Snover-Clift, A. Wyenandt,  N.J. Grunwald, and C. D. Smart.  2012.  The 2009 Late Blight Pandemic in Eastern USA – causes and results.  APSnet Feature Article.  Online.  http://www.apsnet.org/publications/apsnetfeatures/Pages/2009LateBlight.aspx

W. E. Fry, M. T. McGrath, A. Seaman, T. A. Zitter, A. McLeod, G. Danies, I. M. Small, K. Myers, K. Everts, A. J. Gevens, B. K. Gugino, S. B. Johnson, H. Judelson, J. Ristaino, P. Roberts, G. Secor, K. Seebold, Jr., K. Snover-Clift, A. Wyenandt, N. J. Grünwald, and C. D. Smart . 2013. The 2009 Late Blight Pandemic in the Eastern United States – Causes and Results. Plant Disease. 97:296-306.

Jordan, S.A., Gevens, A.J.  2012.  Evaluation of the fumigants Pic-C60 and Pic Plus for control of clubroot and black rot of cabbage grown in Wisconsin, 2011.  Plant Disease Management Reports 6:V092.  Online publication.  

Jordan, S.A., Dobbs, J., Clark, R., Cleveland, K.M., Gevens, A.J.  2012.  Evaluation of fungicides for control of late blight in potato in storage, 2010-2011.  Plant Disease Management Reports 6:V093.  Online publication.  

Jordan, S.A., Dobbs, J., Clark, R., Cleveland, K.M., Gevens, A.J.  2012.  Evaluation of fungicides for pink rot control in potato storage – Hancock, 2010-2011.  Plant Disease Management Reports 6:V095.  Online publication.  

Jordan, S.A., Webster, B.J., Crockford, A., Gevens, A.J.  2012.  Evaluating fumigation and at-plant treatments for control of potato common scab in Wisconsin, 2011.  Plant Disease Management Reports 6:V096.  Online publication. 

Webster, B.J., Gevens, A.J.  2012.  Evaluation of ozone and phosphorous acid to control silver scurf spread on tubers in storage, 2011.  Plant Disease Management Reports 6:V097.  

Webster, B.J., Jordan, S.A., Gevens, A.J.  2012.  Evaluation of fungicide treatments and application schedule on foliar blight of carrot, 2011.  Plant Disease Management Reports 6:V115.  Online publication.

Jordan, S.A., Dobbs, J., Cleveland, K.M., Gevens, A.J.  2012.  Evaluation of foliar fungicide for control of early blight of potato in Wisconsin, 2011.  Plant Disease Management Reports 6:V125.  Online publication. 

Sanchez Perez, A., Seidl, A.C., Gevens, A.J.  2012.  Oospore potential of newly introduced genotypes of Phytophthora infestans.  American Journal of Potato Research.  89(1):30-52.

Cleveland, K.M., Dobbs, J., Clark, R., Gevens, A.J.  2012.  Evaluating the efficacy of fungicide programs for the control of potato early blight in the Central Sands of Wisconsin.  American Journal of Potato Research.  89(1):30-52.

Webster, B.J., Clark, R., Gevens, A.J.  2012.  Evaluating the spread of potato powdery scab in storage.  American Journal of Potato Research.  89(1):30-52.

Everts, K. L., Osborne, L., Gevens, A.J. , Vasquez, S. J., Gugino, B. K., Ivors, K., and Harmon, C. 2012. Extension Plant Pathology: Strengthening resources to continue serving the public interest. Phytopathology 102:652-655. 

Ojiambo, P.S., Holmes, G.J., Britton, W., Keever, T., Adams, M.L., Babadoost, M., Bost, S.C., Boyles, R., Brooks, M., Damicone, J., Draper, M.A., Egel, D.S., Everts, K.L., Ferrin, D.M., Gevens, A.J., Gugino, B.K., Hausbeck, M.K., Ingram, D.M., Isakeit, T., Keinath, A.P., Koike, S.T., Langston, D., McGrath, M.T., Miller, S.A., Mulrooney, R., Rideout, S., Roddy, E., Seebold, K.W., Sikora, E.J., Thornton, A., Wick, R.L., Wyenandt, C.A., and Zhang, S. 2011. Cucurbit downy mildew ipmPIPE: a next generation web-based interactive tool for disease management and extension outreach. Online. Plant Health Progress doi:10.1094/PHP-2011- 0411-01-RV. 

Zhang, S., Klassen, W., Mo, X., Ji, P., Gevens, A.J.  2011.  Evaluation of Acibenzolar-S-methyl and silicic acid for control of Phytophthora blight caused by Phytophthora capsici in squash.  Proceedings of the Florida State Horticultural Society. 124:154-161.

Jordan, S.A, Mailhot, D.J., Gevens, A.J., Marois, J.J., Wright, D.L., Harmon, C.L., and Harmon, P.F.  2010.  Characterization of kudzu (Pueraria spp.) resistance to Phakopsora pachyrhizi, the causal agent of soybean rust. Phytopathology 100(9):941-948. 

Maia, G.S.,Gevens, A.J.  2009.  Characterization of cucurbit powdery mildew in north Florida.  Proceedings of the Florida State Horticultural Society 122: 247-250.

Gevens, A. J., Maia, G.S., Jordan, S.A.  2009.  First Report of Powdery Mildew Caused by Golovinomyces cichoracearum on Crotalaria juncea (‘Tropic Sun’ Sunn hemp).  Plant Disease.  93(4)427.

Gevens, A. J., Nequi, N., Vitoreli, A., Marois, J. J., Wright, D. L., Harmon, C. L., Harmon, P. F.  2008.  First Report of Soybean Rust Caused by Phakopsora pachyrhizi on Erythrina herbacea (Coral bean).  Plant Disease.  92(10)1472. 

Gevens, A. J., Donahoo, R. S., Lamour, K. H., and Hausbeck, M. K.  2008.  Characterization of Phytophthora capsici causing foliar and pod blight of snap bean in Michigan.  Plant Disease 92(2)201-209. 

Gevens, A. J., Donahoo, R. S., Lamour, K. H., and Hausbeck, M. K.  2007.  Characterization of Phytophthora capsici from Michigan surface irrigation water.  Phytopathology 97(4)421-428. 

Gevens, A.J., Harlan, B.R., and Hausbeck, M.K., Singletary, S.  2007.  Plant Disease Management Report Volume 1:  OT004.  Fungicide and Nematicide Tests.  Field evaluation of fungicides for control of downy mildew on rose, 2006.  Online Publication. 

Gevens, A.J., Harlan, B.R., and Hausbeck, M.K., Singletary, S. 2007.  Plant Disease Management Report Volume 1:  OT005.  Fungicide and Nematicide Tests.  Field evaluation of registered fungicides for control of downy mildew on rose, 2006.  Online Publication. 

Gevens, A. J. and Hausbeck, M. K.  2006.  Fungicide and Nematicide Tests Report No. 61:V062.   Evaluation of fungicides for control of downy mildew of cucurbits, 2005.  Online publication.  

M. K. Hausbeck, Gevens, A. J., and Cortright, B.  2006.  Integrating cultural and chemical strategies to control Phytophthora capsici and limit its spread.  Proceedings of the International Cucurbitaceae Conference, Asheville, NC.  pp. 427-435.

Gevens, A. J., Ando, K., Lamour, K. H., Grumet, R., and Hausbeck, M. K.  2006.    A detached cucumber fruit method to screen for resistance to Phytophthora capsici and effect of fruit age on susceptibility to infection.  Plant Disease 90(10)1276-1282. 

Boddu, J., Svabek, C., Sekhon, R., Gevens, A. J., Nicholson, R. L., Jones, A. D., Pedersen, J. F., Gustine, D. L., and Chopra, S.  2004.  Expression of a putative flavonoid 3’-hydroxylase in sorghum mesocotyls synthesizing 3-deoxyanthocyanidin phytoalexins.  Physiological and Molecular Plant Pathology 65:101-113.

Chopra, S., Gevens, A. J., Svabek, C., Wood, K. V, Peterson, T., and Nicholson, R. L.  2002.  Excision of the Candystripe 1 transposon from a hyper-mutable Y1-cs allele shows that the sorghum Y1 gene controls the biosynthesis of both 3-deoxyanthocyanidin phytoalexins and phlobaphene pigments.  Physiological and Molecular Plant Pathology 60:321-330.

Aguero M. E., Gevens, A. J., Nicholson, R. L.  2002.  Interaction of Cochliobolus heterostrophus with phytoalexin inclusions in Sorghum bicolor.  Physiological and Molecular Plant Pathology 61:267-271.

Gevens, A. J., Carver, T. L. W., Thomas, B. J., Nicholson, R. L.  2001.  Visualization and partial characterization of the ECM of Pestalotia malicola on artificial and natural substrata.  Physiological and Molecular Plant Pathology 58:277-285.

Gevens, A. J., Nicholson, R. L. 2000.  In This Issue  “Cutin composition:  A subtle role for fungal cutinase?” Physiological and Molecular Plant Pathology 57:43-45.