Zachariah

I joined the Entomology and Plant Pathology Department in January 2018. Prior to joining the EPP department I was a Post-Doctoral Associate at Cornell University in the laboratory of Dr. Sarah Pethybridge, where I worked on disease forecasting systems for a fungal disease of table beet called Cercospora leaf spot. I also received my Ph.D. in Plant Pathology at Cornell University under the advisement of Dr. Christine Smart working on diagnostics, population genetics, and management of tomato and potato late blight, caused by the oomycete Phytophthora infestans. I received my B.A. and M.S. degrees from Clemson University, where I worked on alternatives to chemical soil fumigation for vegetable disease management under the advisement of Dr. Anthony Keinath. I have also spent time in private industry as an arborist for Bartlett Tree Experts, as well as Plant Pathology Lead for Zymtronix Catalytic Systems Inc., where I conducted research towards commercializing a novel approach to plant disease management using enzymes. My research focuses on integrated approaches to improving specialty crop disease management. The purpose of my program is to support the specialty crops industry in the State of Tennessee, especially fruit and vegetable producers, through applied plant pathology research and extension, and to mentor undergraduate and graduate students.

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Research focus

My academic appointment is 100% extension. My extension efforts are supported by an applied research program aimed at improving specialty crop disease management. Areas of research interest include sustainable disease management, cultural practices, improving chemical use efficiency, pathogen detection and diagnostics, population genetics of fungi and oomycetes, and monitoring for fungicide resistance. Research is largely guided by disease issues affecting Tennessee specialty crop producers, with the goal of mitigating losses to disease.

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Extension and outreach focus

The goal of my extension program is to support Tennessee specialty crops producers through education programming aimed at improving disease management. Working closely with extension agents, education programs are focused on integrated pest management to promote effective and sustainable disease management practices. My applied research program supports these efforts by focusing on integrated disease management strategies including cultivar selection, cultural practices, biological and chemical control, and improved understanding of pathogen biology and disease epidemiology.

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Teaching focus

I do not have an academic teaching appointment, but teaching is a major focus of my program through my extension efforts. Additionally, I am always interested in mentoring motivated students. I have an open-door philosophy, and I view my role as a mentor to push students to access their potential while providing guidance, resources, and direction to support their success.

zachariah hansen

Assistant Professor
Office: (865) 974-7784
Fax: (865) 974-4744
zhansen1@utk.edu

G059 McCord Hall
2640 Morgan Cir Drive
Knoxville, TN 37996-4560

Education
B.A., Biological Science, Clemson University
M.S., Plant and Environmental Science, Clemson University
Ph.D. Plant Pathology, Cornell University

website
Hansen Lab

Professional appointment
100% Extension

Graduate program concentrations
Sustainable Disease and Integrated Pest Management Systems

Areas of expertise
Specialty Crop Disease Management, Pathogen Detection and Diagnostic

KEYWORDS
Sustainable Agriculture, Disease Management, IPM, Detection, Diagnostics, Population Genetics, Specialty Crops, Fruit, Vegetables, Fungi, Oomycetes

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Research questions in our laboratory

  • What are the major diseases affecting Tennessee specialty crop producers?
  • How are specialty crop diseases currently managed?
  • How do cultural practices influence disease occurrence and severity?
  • How does pathogen population structure affect disease epidemiology and management?
  • Is there an opportunity to deploy host resistance as part of a disease management program?
  • Are chemicals used to manage diseases effective?
  • Does fungicide and antibiotic resistance exist in key pathogen populations in Tennessee, and how prevalent is that resistance?
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Current lab members

  • Rufus Akinrinlola
  • Alyssa Counce
  • Taylor Miller

Extension and Technical Publications

Velandia, M., Denton, R., Aza, O., Marshall, T., Rihn, A., Lockwood, D., Bumgarner, N., & Hansen, Z. 2022. Sample Budget for Blackberry Production Under Various Integrated Pest Management and Marketing Strategies, 2022, D154.

Akinrinlola, R., Gwinn, K., Wang, T., & *Hansen, Z. 2022. Numerous fungicides suppress hemp powdery mildew in the greenhouse in Tennessee, 2021. Plant Disease Management Reports. *Co-advisor to Ph.D. student Rufus Akinrinlola and senior author.

Akinrinlola, R., & *Hansen, Z. 2022. Evaluation of fungicides for managing foliar hemp diseases, 2021. Plant Disease Management Reports. *Co-advisor to Ph.D. student Rufus Akinrinlola and senior author.

Hansen, Z. 2022. Evaluation of fungicides for managing black shank in burley tobacco, 2021. Plant Disease Management Reports. Submitted Dec. 9, 2021.

Hansen, Z., Vail, K., Hale, F., & Bumgarner, N. 2021. Disease and Insect Control in Home Fruit Plantings. University of Tennessee Extension, PB1622.

Hansen, Z. 2021. 5 Tips for Preventing Diseases on Hemp. Hemp Grower Magazine, available online.

Kemble, J.M., Jennings, K.M., Meadows, I.M., Walgenbach, J.F., Wszelaki, A.L.,…Hansen, Z.R. et al. 2021. 2021 Southeastern U.S. Vegetable Crop Handbook. Meister Media. Cooperative effort between Auburn University, Clemson University, LSU University, Mississippi State University, NC State University, Oklahoma State University, University of Arkansas, University of Georgia, University of Kentucky, University of Tennessee, & Virginia Tech University. Hansen role: contributed to and co-edited disease management section.

Walgenbach, J., Parker, M., Kon, T., Villani, S., Mitchem, W., Lockwood, D.,…Hansen, Z., et al. 2021. 2021 Integrated Orchard Management Guide for Commercial Apples in the Southeast. Cooperative effort between Auburn University, University of Arkansas, Clemson University, University of Georgia, NC State University, & University of Tennessee. Hansen role: contributed to and co-edited disease management section.

Blaauw, B., Brannen, P., Lockwood, D., Schnabel, G., Ritchie, D.,…Hansen, Z., et al. 2021. 2021 Southeastern peach, nectarine, and plum pest management and culture guide. Cooperative effort between Auburn University, Clemson University, University of Florida, University of Arkansas, University of Georgia, Louisiana State University, Mississippi State University, NC State University, University of Tennessee, Texas A&M University, and USDA-ARS Byron, GA.

Hansen, Z., Akinrinlola, R., Kelly, H., Sykes, V., Guyer, R., Cartwright, M., Grant, J., & Cosner, J. 2021. Hemp Variety Trials in Tennessee 2020. University of Tennessee Extension, W1016.

Siegenthaler, T., & *Hansen, Z. 2021. Fungicide Recommendations for Phytophthora Blight Management in Tennessee in Light of Newly Discovered Fungicide Resistance. University of Tennessee Extension, W1003. *Major advisor to M.S. student Tim Siegenthaler, and senior author.

Siegenthaler, T., & *Hansen, Z. 2021. Lettuce Drop (aka White Mold, Sclerotinia) Management. University of Tennessee Extension, W1002. *Major advisor to M.S. student Tim Siegenthaler, and senior author.

Akinrinlola, R., & *Hansen, Z. 2021. Hemp Fungicide Efficacy Field Trial for Leaf Spot and Powdery Mildew. University of Tennessee Extension, W995. *Co-advisor to Ph.D. student Rufus Akinrinlola and senior author.

Akinrinlola, R., & *Hansen, Z. 2021. Assessment of fungicide products for control of hemp leaf spot and powdery mildew in Tennessee, 2020. Plant Disease Management Reports, 15: V082. *Co-advisor to Ph.D. student Rufus Akinrinlola and senior author.

Bailey, A., Pearce, B., Bush, L., Miller, B., Ritchey, E., Pfeufer, E., Thiessen, L.,… Hansen, Z. et al. (2021). 2021-2022 Burley and Dark Tobacco Production Guide. Cooperative effort between the University of Kentucky, University of Tennessee, Virginia Tech, and NC State University.

Akinrinlola, R., & *Hansen, Z. 2021. Hemp Fungicide Efficacy Field Trial for Leaf Spot and Powdery Mildew. University of Tennessee Extension, W995. *Co-advisor to Ph.D. student Rufus Akinrinlola and senior author.

Wszelaki, A., Lockwood, D., & Hansen, Z. 2020. Fruit and Vegetable Diagnostic Checklist: More Rapid Responses to Grower Questions by Knowing What to Ask. University of Tennessee Extension.

Hansen, Z., Bernard, E., Gwinn, K., Hale, F., Kelly, H., & Stewart, S. 2020. Hemp Disease and Pest Management. University of Tennessee Extension, W916.

Sykes, V., Walker, E., Robertson, T., Hansen, Z., Kelly, H., Cartwright, M., Wilson, A., & Schneider, L. 2020. Hemp Variety Trials in Tennessee 2019. University of Tennessee Extension, W900.

Smith, T., *Hansen, Z., & Lockwood, D. 2020. Commercial Grape Downy Mildew Management. University of Tennessee Extension, W887. *Senior author, member of Ty Smith’s graduate committee.

Velandia, M., Denton, R., Hansen, Z., Lockwood, D., Bumgarner, N., & Rihn, A. 2020. Sample Budget for Blueberry Production under various Integrated Pest Management and Marketing Strategies, 2020. University of Tennessee Extension.

Blaauw, B., Brannen, P., Lockwood, D., Schnabel, G., Ritchie, D.,…Hansen, Z., et al. 2020. 2020 Southeastern peach, nectarine, and plum pest management and culture guide. Cooperative effort between Auburn University, Clemson University, University of Florida, University of Arkansas, University of Georgia, Louisiana State University, Mississippi State University, NC State University, University of Tennessee, Texas A&M University, and USDA-ARS Byron, GA.

Nita, M., Brannen, P., Cline, B., Villani, S., Hansen, Z., Burrack, H., Pfieffer, D., Blaauw, B., Hale, F., Mitchem, W., Lockwood, D., Mengak, M., Sial, A., & Stafne, E. 2020. 2020 Southeast Regional Bunch Grape Integrated Management Guide. Cooperative effort between Virginia Tech, University of Georgia, NC State University, University of Tennessee, & Mississippi State University.

Walgenbach, J., Parker, M., Kon, T., Villani, S., Mitchem, W., Lockwood, D.,…Hansen, Z., et al. 2020. 2020 Integrated Orchard Management Guide for Commercial Apples in the Southeast. Cooperative effort between Auburn University, University of Arkansas, Clemson University, University of Georgia, NC State University, & University of Tennessee.

Majumdar, A., Kemble, J.M., Sikora, E.J., Hansen, Z.R. et al. 2020. 2020 Southeastern U.S. Vegetable Crop Handbook. (J. M. Kemble, I. M. Meadows, K. M. Jennings, & J. F. Walgenbach, Eds.). Meister Media. Cooperative effort between Auburn University, Clemson University, LSU University, Mississippi State University, NC State University, Oklahoma State University, University of Arkansas, University of Georgia, University of Kentucky, University of Tennessee, & Virginia Tech University.

Hansen, Z.R., Kelly, H., and Walker, E. 2020. Susceptibility of hemp varieties to leaf spot in Tennessee, 2019. Plant Disease Management Reports, 14:V056.

Hansen, Z.R. 2020. Comparison of conventional and organic fungicides, application intervals, and cultivars to manage tomato early blight, 2019. Plant Disease Management Reports, submitted.

Hansen, Z. 2019. Managing Strawberry Anthracnose. University of Tennessee Extension, W847.

Hansen, Z., & Bost, S. 2019. Commercial Pumpkin Disease Management Guide. University of Tennessee Extension, W848.

Velandia, M., Smith, A., Ahles, A., Hansen, Z., Hale, F., Wszelaki, A., & Moore, J. 2019. Sample Budgets for Large-scale Bell Pepper Operations and the Impact of Phytophthora Blight on Farm Revenue and Costs. University of Tennessee Extension, W831.

Hansen, Z., & Hensley, D. 2019. Tobacco disease management. University of Tennessee Extension, W815.

Hansen, Z. 2019. Commercial pecan disease management spray guide. University of Tennessee Extension, W814.

Hansen, Z., Siegenthaler, T., & Swafford, A. 2019. Managing Phytophthora blight of peppers and cucurbits. University of Tennessee Extension, W810.

Blaauw, B., Brannen, P., Lockwood, D., Ritchie, D.,…Hansen, Z., et al. 2019. 2019 Southeastern peach, nectarine, and plum pest management and culture guide. Cooperative effort between Auburn University, Clemson University, University of Florida, University of Georgia, Louisiana State University, Mississippi State University, NC State University, University of Tennessee, Texas A&M University, and USDA-ARS Byron, GA.

Hansen, Z.R. 2019. Comparison of conventional and organic fungicides, application intervals, and cultivars to manage tomato early blight in Tennessee, 2018. Plant Disease Management Reports, 13:V003.

Pearce, B., Bailey, A., Bush, L., Green, J. D., Jack, A., Miller, B., Thiessen, L.,… Hansen, Z. et al. (2019). 2019-2020 Burley and Dark Tobacco Production Guide. Cooperative effort between the University of Kentucky, University of Tennessee, Virginia Tech, and NC State University.

Majumdar, A., Kemble, J.M., Sikora, E.J., Hansen, Z. R. et al. (2019). 2019 Southeastern U.S. Vegetable Crop Handbook. (J. M. Kemble, I. M. Meadows, K. M. Jennings, & J. F. Walgenbach, Eds.). Meister Media.

Walgenbach, J., Parker, M., Kon, T., Villani, S., Mitchem, W., Lockwood, D.,…Hansen, Z., et al. 2019. 2019 Integrated Orchard Management Guide for Commercial Apples in the Southeast. Cooperative effort between Auburn University, University of Arkansas, Clemson University, University of Georgia, NC State University, & University of Tennessee.

Hansen, Z.R. 2018. Be on the lookout for grapevine leaf rust. NPDN news v13, November 2018.

Hansen, Z.R., Windham, A., & Windham, M. 2018. Grapevine Leaf Rust. University of Tennessee Extension, W790.

Meadows, I., Carley, D.S., Hansen, Z.R., Jennings, K., et al. (2018). PMSP for tomato in the Southeast region. USDA NIFA Southern IPM Center.

Bumgarner, N., Hansen, Z.R., & Vail, K. 2018. Conventional and organic product overview for home vegetable gardeners in Tennessee. University of Tennessee Extension. W661.

Pethybridge, S.J., Hansen, Z.R., & Knight, N.L. 2018. Efficacy of fungicides for Cercospora leaf spot control in table beet, 2017. Plant Disease Management Reports 12:CF086.

Hansen, Z.R., & Smart, C.D. 2013. Tomato variety trial for resistance to late blight, 2012. Plant Disease Management Reports 7:V090.

Smart, C.D., & Hansen, Z.R. 2012. 2012 trial of late blight resistance in tomato varieties. Veg Edge Vol. 8, issue 27. Cooperative Extension Publication, Cornell University.

Keinath, A.P., Hassell, R.L., DuBose, V.B., & Hansen, Z.R. 2012. Evaluation of three fumigants to control soilborne pathogens on processing tomato, 2011.Plant Disease Management Reports 6:V025.

Hansen, Z.R., Keinath, A.P., Baccari, G.V., & DuBose, V.B. 2011.  Evaluation of brassica cover crops for control of root rot in peppers. Plant Disease Management Reports 5:V073.



SELECTED REFEREED PUBLICATIONS

Moore, J., Leib, B., Hansen, Z., & Wszelaki, A. 2022. Comparing overhead versus drip irrigation for production of three cultivars of romaine lettuce on biodegradable plastic mulch. Hort Technology, 32, 39-46. https://doi.org/10.21273/HORTTECH04916-21.

Gwinn, K., Hansen, Z., Kelly, H., & Ownley, B. 2022. Diseases of Cannabis sativa caused by diverse Fusarium species. Frontiers in Agronomy, 3, article 796062. https://doi.org/10.3389/fagro.2021.796062.

Siegenthaler, T., Lamour, K., & *Hansen, Z. 2022. Population structure of Phytophthora capsici in the state of Tennessee. Mycological Progress (21), 159-166. https://doi.org/10.1007/s11557-021-01769-7. *Major advisor to M.S. student Tim Siegenthaler, and senior author. 

Parada-Rojas, C., Granke, L., Naegele, R., Hansen, Z., Hausbeck, M., Kousik, C., McGrath, M., Smart, C., & Quesada-Ocampo, L. 2021. A Diagnostic Guide for Phytophthora capsici infecting vegetable crops. Plant Health Progress, https://doi.org/10.1094/PHP-02-21-0027-FI.

Siegenthaler, T., & *Hansen, Z. 2021. Sensitivity of Phytophthora capsici from Tennessee to mefenoxam, fluopicolide, oxathiapiprolin, dimethomorph, mandipropamid, and cyazofamid. Plant Disease (105), 3000-3007. https://doi.org/10.1094/PDIS-08-20-1805-RE. *Major advisor to M.S. student Tim Siegenthaler, and senior author.

Pethybridge, S., Sharma, S., Hansen, Z., Kikkert, J., Olmstead, D., & Hanson, L. 2020. Optimizing Cercospora leaf spot control in table beet using action thresholds and disease forecasting. Plant Disease (104), 1831-1840. https://doi.org/10.1094/PDIS-02-20-0246-RE.

Pethybridge, S., Sharma, S., Hansen, Z., Vaghefi, N., Hanson, L., & Kikkert, J. 2019. Improving fungicide-based management of Cercospora leaf spot in table beet in New York, USA. Canadian Journal of Plant Pathology. https://doi.org/10.1080/07060661.2019.1690048.

Aiello, D., Hansen, Z.R., Smart, C.D., Polizzi, G., & Guarnaccia, V. 2018. Characterisation and mefenoxam sensitivity of Phytophthora spp. from ornamental plants in Italian nurseries. Phytopathologia Mediterranea (57), 245-256.

Knight, N.L., Vaghefi, N., Hansen, Z.R., Kikkert, J.R., & Pethybridge, S.J. 2018. Temporal differentiation and shifts in genetic structure of Cercospora beticola populations in table beet fields of New York. Plant Disease (102), 2074-2082.

Hansen, Z.R., Donnelly, M.K., & Corgié, S.C. 2017. In-vitro inhibition of Pythium ultimum, Fusarium graminearum, and Rhizoctonia solani by a stabilized lactoperoxidase system alone and in combination with five fungicides. Agronomy (7), 1-13.

Hansen, Z.R., Everts, K.L., Fry, W.E., Gevens, A.J., Grünwald, N.J., Gugino, B.K., Knaus, B.J., Johnson, D.A., Johnson, S.B., Judelson, H.S., McGrath, M.T., Myers, K.L., Ristaino, J.B., Roberts, P.D., Secor, G.A., & Smart, C.D. 2016. Genetic variation within clonal lineages of Phytophthora infestans revealed through genotyping-by-sequencing, and implications for late blight epidemiology. PLoSONE (11), e0165690.

Hansen, Z.R., Knaus, B.J., Tabima, J.F., Press, C.M., Judelson, H.S., Grünwald, N.J., & Smart, C.D. 2016. SNP-based differentiation of Phytophthora infestans clonal lineages using locked nucleic acid probes and high resolution melt analysis. Plant Disease (100), 1297-1306.

Hansen, Z.R., Knaus, B.J., Tabima, J.F., Press, C.M., Judelson, H.S., Grünwald, N.J., & Smart, C.D. 2016. Loop-mediated isothermal amplification (LAMP) for detection of the tomato and potato late blight pathogen, Phytophthora infestans. Journal of Applied Microbiology (120), 1010-1020.

Hansen, Z.R., Small, I.M., Mutschler, M., Fry, W.E., & Smart, C.D. 2014. Differential susceptibility of 39 tomato varieties to Phytophthora infestans clonal lineage US-23. Plant Disease (98), 1666-1670.

Guarnaccia, V., Hansen, Z.R., Aiello, D., Smart, C.D., & Polizzi, G. 2014. First detection of root rot and foliar blight on Pittosporum (Pittosporum tenuifolium) caused by Pythium irregulare in Italy. Journal of Phytopathology (163), 411-414.

Keinath, A.P., & Hansen, Z.R. 2013. Isolates of Didymella bryoniae from South Carolina remain sensitive to DMI fungicides despite multi-year exposure. Journal of Phytopathology (161), 315–323.

Hansen, Z.R., Keinath, A.P. 2012. Increased pepper yields following incorporation of biofumigation cover crops and the effects on soilborne pathogen populations and pepper diseases. Applied Soil Ecology (63), 67-77.



PUBLIC ABSTRACTS

Hansen, Z. 2022. Black shank fungicide trials. (Abstract accepted) Tobacco Worker’s Conference, Richmond, VA. January 24-26.

Hansen, Z., Keeney, A., Pfeufer, E., & Bailey, A. 2022. Dark tobacco variety evaluations for susceptibility to angular leaf spot. (Abstract accepted) Tobacco Worker’s Conference, Richmond, VA. January 24-26.

Miller, T., Richmond, M., & *Hansen, Z. 2022. In vitro fungicide testing on the tobacco black shank pathogen, Phytophthora nicotianae, in Tennessee. (Abstract accepted) Tobacco Worker’s Conference, Richmond, VA. January 24-26. *Major advisor to M.S. student Taylor Miller, and senior author.

Barboza, N., Akinrinlola, R., Gwinn, K., Kelly, H., & *Hansen, Z. 2021. Fusarium Species Associated with Hemp in Tennessee. Science of Hemp. Virtual Conference, November 19. *Faculty advisor to B.S. student Nicole Barboza, and senior author.

Gwinn, K., Hansen, Z., Akinrinlola, R., Barboza, N., Kelly, H., & Ownley, B. 2021. Fusarium diseases of Cannabis sativa: a review. Science of Hemp. Virtual Conference, November 19.

Keeney, A.B., Bailey, W.A., & Hansen, Z.R. 2021. Differential susceptibility to angular leaf spot (Pseudomonas syringae pv. tabaci) in dark tobacco varieties. CORESTA. Virtual Conference, October 4-14.

Akinrinlola, R., Wang, T., Gwinn, K., Fei, T., & *Hansen, Z. 2021. Fungicide efficacy against hemp powdery mildew in the greenhouse. American Phytopathological Society Annual Meeting. Virtual Conference, August 2-6. *Co-advisor to Ph.D. student Rufus Akinrinlola and senior author.

Wright, H., Bumgarner, N., Fulcher, A., Brosnan, J., Florence, R., Hale, F., Hansen, Z., Holland, R., Lockwood, D., Rihn, A., Samples, T., Tsuruda, J., Windham, A., Wszelaki, A, and Velandia, M. (2021). Insights Gained from Distance Technology during COVID-19: Evaluation of the Horticulture Hot Topics Series. ASHA 2021: Elevating Horticulture, Denver, CO, August 5-9.

Cosner, J., Grant, J. F., & Hansen, Z. R. 2021. Influence of varietal characteristics of hemp, Cannabis sativa, on corn earworm, Helicoverpa zea, in Tennessee. Entomological Society of America Virtual Eastern, Southeastern, and Pacific Branch Meetings. March 29-31.

Akinrinlola, R., & *Hansen, Z. 2021. Assessment of fungicide efficacy for hemp leaf spot and powdery mildew in Tennessee. Southern Division American Phytopathological Society Meeting. Virtual Conference, February 18. *Co-advisor to Ph.D. student Rufus Akinrinlola and senior author.

Cosner, J. F. Grant, Z. R. Hansen, and H. M. Kelly. 2020. Corn earworm (Helicoverpa zea Boddie) on hemp: The Unwanted Consumer. Proceedings of Virtual Annual Meeting of the Tennessee Entomological Society Conference. October 9.

Wszelaki, A., Moore, J., Hansen, Z., Leib, B. 2020. Comparing Lettuce Yield and Quality Using Drip and Overhead Irrigation on Biodegradable Mulch. American Society for Horticultural Science Annual Conference. Virtual Conference, August 10-13.

Siegenthaler, T., & *Hansen, Z. 2020. Population structure and genetic diversity of Phytophthora capsici in Tennessee. American Phytopathological Society Annual Meeting. Virtual Conference, August 8-12. *Major advisor to M.S. student Tim Siegenthaler, and senior author.

Smith, T., Kelly, H., & Hansen, Z. 2020. Fungicide efficacy on target spot in Tennessee soybean and cotton. American Phytopathological Society Annual Meeting. Virtual Conference, August 8-12.

Hansen, Z., Walker, E., Bailey, W., & Ellis, R. 2020. Dark tobacco variety evaluation for angular leaf spot susceptibility. Tobacco Workers Conference, Louisville, KY. January 20-23.

Hansen, Z.R., Kelly, H.M., & Walker, E. 2020. Susceptibility of hemp varieties to leaf spot in Tennessee. Southern Division American Phytopathological Society Meeting. Charleston, SC. February 9-12.

Smith, T.M., Kelly, H.M., & Hansen, Z.R. 2020. Fungicide sensitivity screening for Corynespora cassiicola and field evaluations. Southern Division American Phytopathological Society Meeting. Charleston, SC. February 9-12.

Smith, T.M., Kelly, H.M., & Hansen, Z.R. 2020. Fungicide sensitivity screening of target spot in cotton and soybean. Beltwide Cotton Conferences. Austin, TX. January 8-10.

Hansen, Z., Siegenthaler, T., Akin, E., Cartwright, M., & Kelly, H. 2019. Hemp extension in Tennessee: most common diseases of 2019. Proceedings of the first annual Science of Hemp Meeting, Lexington, KY.

Cartwright, M., Hansen, Z., Kelly, H., & Walker, E. 2019. Diseases of Hemp in Tennessee. 1st Annual Science of Hemp Conference. Lexington, KY. Oct. 10-11.

Gwinn, K., Bernard, E., Hansen, Z., Boggess, S., Chaffin, A., & Trigiano, R. 2019. Powdery mildew in field-grown hemp. 1st Annual Science of Hemp Conference. Lexington, KY. Oct. 10-11.

Siegenthaler, T., & *Hansen, Z.R. 2019. Population structure and fungicide sensitivity of Phytophthora capsici in Tennessee. Phytopathology. *Major advisor to M.S. student Tim Siegenthaler, and senior author.

Hansen, Z.R. 2019. Comparison of conventional and organic fungicides, application intervals, and cultivars to manage tomato early blight in Tennessee. Phytopathology.

Kikkert, J.R., Hansen, Z.R., and Pethybridge, S.J. 2018. Organic management of foliar diseases in table beets to support the expanding industry in New York State. National Association of County Agriculture Agents Annual Meeting & Professional Improvement Conference, Chattanooga, TN, July 29-Aug 2.

Knight, N.L., Vaghefi, N., Hansen, Z.R., Kikkert, J., & Pethybridge, S.J. 2017. Temporal shifts in genetic structure and differentiation of Cercospora beticola populations in table beet fields of New York. Northeast Division Meeting of the American Phytopathological Society, Quebec City, Canada, November 3.

Hansen, Z.R., & Smart, C.D. 2015. A three-pronged approach to late blight management; host resistance, diagnostics, and understanding pathogen diversity. I.E. Melhus Graduate Student Symposium. American Phytopathological Society Annual Meeting. Pasadena, CA. August 3.

Hansen, Z.R., Sudermann, M., Small, I.M., Mutschler, M., Fry, W.E., & Smart, C.D. 2014. Differential Susceptibility of Thirty Nine Tomato Varieties to Phytophthora infestans Clonal Lineage US-23, and Detection Using LAMP. Proceedings of the North American Late Blight Symposium. Minneapolis, MN. August 8-9.

Sudermann, M.A., Hansen, Z.R., & Smart, C.D. 2014. Rapid diagnostic and detection strategies for management of tomato late blight. Proceedings of the 2014 Summer Scholars Program. Geneva NY, July 31.

Hansen, Z.R., Small, I.M., Fry, W.E., & Smart, C.D. 2013. Tomato late blight: host resistance and inoculum detection. Annual USDA AFRI late blight grant meeting. Atlanta, GA. November 18-19.

Wozer, K., Hansen, Z.R., & Smart, C.D. 2013. Phytophthora infestans detection and race studies to squelch late blight disease in tomato plants. Proceedings of the 2013 Summer Scholars Program. Geneva NY, July 31.

Hansen, Z.R., & Keinath, A.P. 2012. Increased pepper yields following incorporation of biofumigation cover crops and their effects on soilborne pathogen populations and pepper diseases. Phytopathology 102:S4.49.

For complete list of publications please visit my