curriculum vitae christopher a. clark education · 2019-02-19 · responsibility for teaching...

CURRICULUM VITAE Christopher A. Clark

Department of Plant Pathology & Crop Physiology

Louisiana State University Baton Rouge, LA 70803-1720

Phone: (225)-578-1381, FAX: (225) 578-1415 E-mail: [email protected]

Education:

Doctor of Philosophy, Cornell University, May 1976 Major - Plant Pathology, Advisor - Dr. J. W. Lorbeer Minors - Soil Microbiology, Advisor - Dr. Martin Alexander Plant Physiology, Advisor - Dr. H. B. Tukey, Jr.

Thesis title - "Histopathology and Leaf Surface Relationships of Botrytis squamosa and B. cinerea on Onion"

Master of Science, Cornell University, January, 1973

Major - Plant Pathology, Advisor - Dr. J. W. Lorbeer Minor - Soil Microbiology Thesis title - "The Botrytis Brown Stain Disease of Onion (Allium cepa L.) Caused

by Botrytis cinerea Pers."

Bachelor of Science, Cornell University, June, 1970. Major - General Agriculture, Advisor - Dr. C.W. Boothroyd

Professional Experience:

Professor - 1987 to present. Presently 86% research, 14% teaching appointment.

Associate Professor - 1981-1987. Assumed 10% teaching appointment with responsibility for teaching phytobacteriology in 1986.

Assistant Professor - 1977-1981, Department of Plant Pathology & Crop Physiology,

Louisiana State University, Baton Rouge, LA. Full time research appointment in the Louisiana Agricultural Experiment Station to conduct research on diseases of sweetpotato.

Postdoctoral Research Associate, Department of Plant Pathology, North Carolina State

University, Raleigh, NC. Conducted research on the etiology and control of seedling and nematode diseases of cotton and on the interaction of soil-borne fungi and nematodes on cotton. (1976 to 1977)

Undergraduate Research Assistant, Department of Plant Pathology, New York State

Christopher A. Clark, page 2

Agricultural Experiment Station, Geneva, NY. Assisted Dr. J. J. Natti in research on diseases of snap beans, dry beans, and crucifers. (Summers, 1966 to 1969)

Teaching:

Plant Health 7011 - Phytobacteriology. Graduate level course on plant pathogenic bacteria. (1987 - 5 students, 1989 - 6 students, 1991 - 9 students, 1993 - 7 students, 1995 - 5 students, 1997 - 6 students, 2001 - 7 students, 2005 - 3 students).

Plant Health 4000 - General Plant Pathology. Undergraduate level course in general

plant pathology (1979 - 25 students, 2007 - 15 students; 2009 – 21 students; 2011 – 23 students; 2013 – 19 students). I taught one lab on bacterial plant diseases annually from 1989 to 1999.

Plant Health 4012 and 4013 - Diseases of Horticultural Crops and Diseases of Agronomic

Crops and PLHL 4014 - Diseases of Economic Crops. Taught sections on diseases of sweetpotatoes.

Plant Health 7003 - Disease Diagnosis and Control Practices. Taught a lecture and lab on

bacterial disease diagnosis.

Plant Health 7052 - Seminar. Coordinated the departmental seminar, Spring 1980 and 1981, Fall 1998, Spring 2003, Spring 2004, Fall 2007, Fall 2010.

Plant Pathology 7051 - Current Topics in Plant Pathology. Developed and taught a

course on general plant pathology for graduate students who had completed Plant Pathology 4000 or the equivalent. The course was taught in the Spring of 1979 and had an enrollment of 6 plant pathology graduate students.

Plant Health 8800 - Practicum in Plant Pathology. Organized the course and served as

coordinator 2004 to 2009. Taught sections on sweetpotato diseases and with Drs. Hollier and Overstreet sections on disease diagnosis. 2009-2013 – responsible for the summer semester.

Veterinary Microbiology and Parasitology 7404 - Pathogenic Mechanisms of Bacteria.

Presented a guest lecture on Pathogenic Mechanisms of Plant Pathogenic Bacteria, Spring, 1990.

Plant Pathology Journal Club - organized with other faculty and graduate students an

informal group discussion of current research and review articles in plant pathology.

Teaching Assistant - Plant Pathology 301, Introductory Plant Pathology, Cornell

University, Spring, 1971. Professor-in-charge - Dr. C. W. Boothroyd


Extramural Funding Obtained:

USDA, SEA Competitive Grant No. 5901-0410-8-1267-0, "Induction and Inheritance of Furanoterpenoid Accumulation in Sweet Potatoes". The sum of $50,000 was granted to C. A. Clark and T. P. Hernandez for two years beginning November 1, 1978.

USDA Contract No. 12-14-7001-1155, "Integrated Pest Management Approach to the

Sweet Potato Breeding Program". The sum of $65,000 was allocated to L. Rolston, C. A. Clark, and T. P. Hernandez for two years beginning April 1, 1979.

USDA Specific Cooperative Agreement 58-43YK-7-0018, "Evaluation of Sweet Potato

Germplasm for Storage Rot and Soil Rot Resistance". The sum of $71,810 was granted for the period 1987-1989.

Louisiana State University College of Agriculture, Research Initiation Grant, "Etiology

of Sweet Potato Chlorotic Leaf Distortion and Sweet Potato Chlorotic Little Leaf", The amount of $10,000 was granted to C. A. Clark for 1984-1985.

Louisiana Sweet Potato Advertising and Development Commission has supported the

sweetpotato disease research program annually since 1978. Support for that period varied from $3,800 to 14,000 per year (total for 1977 to 2005 = $224,410; 2006 = $7,000; 2007 = $8,000; 2008 = $7,800; 2009 = $4,500; 2010 = $6,700; 2011 = $8,300).

The Louisiana Soybean and Grain Research and Promotion Board contributed $20,000

during 1987-88 for research on delayed maturity of soybeans.

The Louisiana Soybean and Grain Research and Promotion Board has contributed $40,500 to S. A. Harrison (Agronomy), C. A. Clark, J. S. Russin, and P. D. Colyer (Red River Station) during 1989-94 for research on bacterial leaf streak of wheat.

A grant of $5,000 was made by the International Potato Center in 1988 and a three-year

grant of $25,000 was initiated in 1989 for research on sweet potato chlorotic leaf distortion by C. A. Clark, D. R. La Bonte, and R. A. Valverde. A second three-year contract was awarded in 1992 for $30,000.

The USDA, ARS Germplasm program funded the proposal: "Evaluation of the United

States Plant Introduction Collection for Reaction to the Reniform Nematode, Rotylenchulus reniformis", by D. R. La Bonte, G. W. Lawrence, and C. A. Clark. The amount of $9,000 for FY 1993 was awarded.


The USDA Foreign Agricultural Service, International Cooperation and Development, Research and Scientific Exchanges Division funded a proposal for an exchange team visit to the People’s Republic of China by D. R. La Bonte, C. A. Clark, J. M. Cannon, M. M. Norton, and P. W. Wilson entitled "Sweetpotato Pest Detection and Screening, Biotechnology, Breeding Methodology, Germplasm, Cultural Practices and Developing Collaborative Research with the People’s Republic of China". The Chinese Ministry of Agriculture paid travel expenses within China of approximately $4,000 per person.

USDA, ARS Research Agreement No. 58-6607-8-008, for Germplasm Evaluation was

funded for $7,800 for two years to C. A. Clark. It was entitled: “Evaluation of Resistance in Sweetpotato (Ipomoea batatas) to races of the Fusarium wilt pathogens Fusarium oxysporum ff. sp. batatas and nicotianae”.

USDA, APHIS Grant Award No. 99-8100-0514-GR, by C. A. Clark, R. A. Valverde, J.

W. Moyer, and R. L. Jarret entitled: “Proposal to Survey Sweetpotatoes in the United States for the Presence of Viruses” was funded in the amount of $9,758 for calendar year 1999. It was refunded for $14,319 in 2000 and again in 2001.

The International Potato Center provided $16,500 to C. A. Clark and R. A. Valverde

under a Memorandum of Understanding; “Identification of Major Potyviruses in Sweetpotato in Peru and Louisiana” for 2001.

Cooperative Agreement No. 58-6402-4-031 with USDA, ARS, Southern Insect

Management Research Unit, Stoneville, MS: “Survey for Viruses in Sweetpotatoes and Wild Related Species and for Field Resistance to Viruses in Sweetpotato Breeding Lines” by C. A. Clark and R. A. Valverde provided $24,000 for the period March, 2004 to March, 2005 and $7,805 for the period March, 2005 to March, 2006.

USDA, CSREES, RAMP Grant Award No. 370831201-02106 provided $2,000,000 for

the period 2003-2007 to a multi-state, mutli-disciplinary team led by George C. Kennedy, North Carolina State University for a project entitled: “Development of Grower Decision-making Tools to Reduce Risk and Enhance Sustainability of Southern Sweetpotato Pest Management Systems”. C. A. Clark was PI for the LSU AgCenter contract totaling $394,575, with A. Hammond and R. Story as co-PIs.

Louisiana Board of Regents Support Fund (ITRS subprogram) funded $118,000 for 2006

to 2008 to LaBonte, D. R., Clark, C. A., McGregor, C., and Kokkinos, C. for a project entitled: “Sweet Potato Virus Disease: Characterizing sweetpotato plant response to infection and identification of molecular markers for resistance breeding”.

USDA Specific Cooperative Agreement 58-6607-7-101 funded $15,600 for 2007-2008


and $13,650 for 2009-2010 for the proposal: “Evaluation of sweetpotato germplasm for resistance to Sweet potato leaf curl virus”.

USDA Specialty Crop Research Initiative funded $2,841,987.00 for 2009-2012 to Smith,

T. P. (LSUAC), LaBonte, D. R. (LSUAC), Villordon, A. Q. (LSUAC), Clark, C. A. (LSUAC), Picha, D. (LSUAC), Miller, D. (LSUAC), Arancibia, R. A. (Miss. St.), Schultheis, J. (North Carolina State), Stoddard, S. (UC, Davis) for the proposal: “Participatory Modeling and Decision Support for Improving Sweetpotato Production Efficiency, Quality and Food Safety”.

Royalties (55% share) received for virus-tested sweetpotatoes from Kleentek/Thermo

Trilogy (now Certis USA): 2001 = $4,000; 2002 = $5,080; 2003 = $4,000; 2004 = $1,925; 2005 = $1,925; 2006 = $2,392.50; 2007 = $1,100; 2008 = $1,100; 2009 = $1,900; 2010 = $1,100; 2011 = $1,760; 2012 = $1,100.

Royalties accrued to department for patented sweetpotato cultivars: 2009 = $1,402; 2010

= $1,255; 2011 = $3,092; 2012 = $5,525.

Chemical company grants for the period 1979 to 2012 totaled $46,400. Honorary Society Memberships:

Member - Phi Kappa Phi, Gamma Sigma Delta Associate member - Sigma Xi

Professional Affiliations:

The American Phytopathological Society Awards:

"Mr. Yam" of the Grand Louisiana Sweet Potato Festival, 1990 Distinguished Service Award presented by the Louisiana Sweet Potato Association, January, 1997 “King” of the Grand Louisiana Sweet Potato Festival, 2001 Tipton Team Research Award to the Sweetpotato Team by the LSU AgCenter, 2002 Doyle Chambers Research Award presented by the LSU AgCenter, December 15, 2008 Outstanding Plant Pathologist presented by the Southern Division, American

Phytopathological Society, February 9, 2010. International Symposium Participation:

September, 1975, presented a paper on; "Development of Botrytis squamosa and B. cinerea on the surface of onion leaves as affected by exogenous nutrients and


epiphytic bacteria" in an international symposium at Leeds University, Leeds, UK, entitled "Advances in the Microbiology of the Aerial Surfaces of Plants".

February, 1987, presented a paper entitled; "Principal Fungal and Bacterial Diseases of

Sweet Potatoes and Their Control" at the Planning Conference on Exploration, Maintenance and Utilization of Sweet Potato Genetic Resources sponsored by the Centro Internacional de la Papa in Lima, Peru.

June, 1991, presented a paper entitled; "Disease Factors in Breeding and Biotechnology

of Sweetpotato" in an International symposium at Tuskegee University entitled: "Sweetpotato Technology for the 21st Century".

September-October, 1995, part of a five-person group from LAES that was funded by

USDA, OICD for “Scientific Exchange on Sweetpotato Pest Detection and Screening, Biotechnology, Breeding Methodology, Germplasm, Cultural Practices, and Developing Collaborative Research with the People's Republic of China”. Presentations were made at: Beijing Agricultural University, Xuzhou Sweetpotato Research Center, Jiangsu Academy of Agricultural Sciences, Zhejiang Agricultural University, and the Guangdong Academy of Agricultural Sciences.

December, 1997, presented a paper entitled; “Prospects and Problems in Managing

Sweetpotato Diseases” in the International Workshop on Sweetpotato Production System toward the 21st Century held at Miyakonojo, Japan.

September, 2000, helped organize and made two presentations at an International

Workshop on Sweetpotato Cultivar Decline Study in Miyakonojo, Japan.

November, 2001, gave a keynote presentation: “Research for Improved Management of Sweetpotato Pests and Diseases: Cultivar Decline and Postharvest Losses” at an international symposium on “Sweetpotato: Food and Health for the Future”, co-sponsored by the International Potato Center, the International Society for Society for Horticultural Science and Universidad Nacional Agraria La Molina, held in Lima, Peru.

Professional Services:

Scientific peer review, competitive grant proposals for: National Science Foundation Binational Agricultural Research and Development Fund USDA, SEA and NRI, Competitive Grants Office USDA, Small Business Initiative International Foundation for Science

USDA Blue Ribbon Panel to evaluate research on the Florida nursery strain of Xanthomonas campestris pv. citri - Gainesville, FL, March 1988.


USDA, ARS Review team member, review of S-9 Southern Regional Plant Introduction Station Program, April, 1992.

American Phytopathological Society - Soil Microbiology and Root Diseases Committee (1980-1982) Associate Editor, Phytopathology (1982-1984) Plant Nematology Committee (1982-1986)

Vice-chairman, 1984 and Chairman, 1985 Associate Editor, Plant Disease (1986-1988) Senior Editor, Plant Disease (1989-1991) Southern Division, chairman, Archives Committee (2002-present) Southern Division, vice president, president-elect, president 2006-2008.

Society of Nematologists - Placement Committee (1983)

National Sweet Potato Collaborators Chairman-elect - 1991, Chairman - 1992 Disease, Insect, and Genetics Committee -

Vice Chairman (1981-1983), Chairman (1983-1985) Nominations Committee - Chairman, 1982 Planning Committee for "50 Years of Progress" publication.

USDA Sweet Potato Crop Advisory Committee (1984-present) Chairman - 1994-1997. Review team member to review USDA, NPGL-QU sweetpotato quarantine

program. Secretary, Louisiana Association of Plant Pathologists and Nematologists. (1978-1979) Louisiana State University

Faculty Senate Library Committee - member 1995-1998, chairman 1997-1998 Distinguished Dissertation Review Committee, Sciences and Engineering - 1996

Louisiana State University, Agricultural Center Sweetpotato Research Advisory Committee, Chairman 1990-1996. LAES Strategic Planning, Focus 2000 - Goal 1 Commodity Committee -

"Vegetables, Sweetpotatoes, Potatoes, Ornamentals, and Turf". College of Agriculture Faculty Policy Committee (1983-1985), Secretary (1984-

1985) Agricultural Engineering Department Head Search Committee (1984) Editorial Board, Louisiana Agriculture (1988-1990) College of Agriculture Promotion and Tenure Committee (1989-1991) LAES Research Priority Committee (2004) LSU AgCenter Promotion and Tenure Committee (2004, 2005) Sweetpotato Extension Specialist Search Committee (2006) Sweet Potato Research Station Research Coordinator Search (2006-2007) Sweet Potato Extension Specialist Search Committee (2013)

Plant Pathology and Crop Physiology Department Faculty Advisor, LSU Plant Sciences Graduate Student Organization. (1977-1979) Student Admissions and Standards Committee, 1983-84 Promotion and Tenure Committee, 1984-86, 1988-1991, 1994-1996, Chairman,


1990. Department Publications Coordinator, 1984-1986 Co-chairman, 1985 CSRS Review Document Committee Chairman, Department Standing Committee on Research, 1985-1986 Member, Department Advisory Committee, 1985-1986 Member, Student Standards Committee, 1990-2001, Chairman 1994-2001 Member of the following search committees:

Department Head, 1983 Soil Microbiologist, 1984 Weed Scientist, 1984 Biotechnologist III, 1985 Virologist, 1987 Department Head, 1990 Mycologist (chairman), 2007 Phytobacteriologist, 2007

Chairman, Department committee on space reallocation (1988, 1989) Department Strategic Planning Committee, Chairman 2001-2002 Courses and Curriculum Committee member (2004-2006)

Graduate Students:

Major advisor for the following students: Ronald J. Thomas, PhD, 1982. Gary W. Lawrence, PhD, 1984. Alice Karikurubu, MS, 1984. Jing-yi Lo, PhD, 1986. Michaele Mooney, did not complete degree. Valmir Duarte, PhD, 1990. Kenneth C. Stetina, MS, 1995. Chiliang Chen, MS, 1997. Eliezer R. Souto, PhD, 1998 (coadvisor with R. A. Valverde) Heather Wallace, MS 2003 (coadvisor with D. R. La Bonte) Jianye Chen, PhD did not complete degree. Laura Mckoin, MAg, 2005. Charalambos Kokkinos, PhD 2006. Everlyne Wosula, PhD, 2012. Washington da Silva, MS, 2013.

Committee member for: Sreedar Alwala, PhD, Agronomy, 2007 Ramon Arancibia, MS, Plant Pathology, 1994 Steve Brewer, PhD, Botany, 1993 Mario Buteler, PhD, Horticulture, 1996 Guohong Cai, MS, 2001, PhD, Plant Pathology, 2004 Ashok Chanda, PhD candidate, Plant Pathology


Se-chul Chun, PhD, Plant Pathology, 1997 Ed Cleveland, PhD, Plant Pathology, 1980 Matthew Ducote, PhD, Biological Sciences, 2003 Don Dufresne, MS, Plant Pathology, 1998 Roberto Dwidjosewojo, PhD, Horticulture, 1980 Karol Elias, PhD, Plant Pathology, 1989 Elif Erturk, PhD, Horticulture, 2000 John Frantom, PhD, Plant Pathology, 1981 Roy French, PhD, Plant Pathology, 1983 Florentino Fernandes, MS, Plant Pathology, 1989 Jake Fountain, MS, 2013, Plant Pathology Felix Francis, MS, 2012, Plant Pathology Clifford Gabriel, MS, Plant Pathology, 1980 Mala Ganiger, MS candidate, Plant Pathology Freddy Garces, PhD, Plant Pathology, 2011 Dina Gutierrez, PhD, Plant Pathology, 2008 Mark Jones, MS, Plant Pathology, 1992 Anthony Kilili, PhD, Horticulture, 2000 BongKyoo Kim, MS, Horticulture, 1993 Choong-Hoe Kim, PhD, Plant Pathology, 1986 Charalambos Kokkinos, MS, Horticulture, 2001 Wendy Kursell, MS, Agronomy, 1991 Monica Lear, PhD, Plant Pathology, 1994 Rebecca Melanson, PhD candidate, Plant Pathology Yong-Hwan Lee, PhD, Plant Pathology, 1991 Yuen Lee, MS, Plant Pathology, 1989 Xiaowen Liang, MS, Plant Pathology, 1998 Tzu-yin Liu, MS, Plant Pathology, 1987 Xiuling Liu, MS, Plant Pathology, 1998 Silvio Lopes, PhD, Plant Pathology, 1996 Pongtharin Lotrakul, PhD, Plant Pathology, 2000 Cecilia McGregor, PhD, Horticulture, 2006 Bond McInnes, PhD, Plant Pathology, 1989 Roland Massaquoi, PhD, Plant Pathology, 1988 Generosa Medrana, Horticulture Douglas Miano, PhD, Horticulture, 2008 Donald Nelsen, MS 2013, Plant Pathology Olga Odiott, Plant Pathology Charles Overstreet, PhD, Plant Pathology, 1988 Meghanathan Pillay, MS, Plant Pathology, 1986 Roberto Rivas, MS, Horticulture, 1991 Rodney Roberts, MS, Plant Pathology, 1982 Andrew Rodriguez, MS, Plant Pathology 2011 Dip Sah, PhD, Plant Pathology, 1986 Carolyn Sevario, MS, Plant Pathology, 2002


Eric Siegel, MS, Plant Pathology, 1997 Jeonggu Sim, PhD, Plant Pathology, 2001 Rebecca Sweany, MS, Plant Pathology, 2009 John Tappan, MS, Agricultural Engineering, 1988 Barry Tillman, PhD, Agronomy, 1994 Sheng-Wu Wang, Horticulture James Young, did not complete degree

Others:

Doña Robinson, Bayou II program, 1992 Postdoctoral Associates and Visiting Scientists

Randall Kelley - 1986-1987 - research on etiology of delayed maturity of soybean. Jae-wook Hyun - 1996 - research on RAPD analysis of Fusarium denticulatum and

Fusarium oxysporum f. sp. batatas. Invited Presentations:

Annually - research presentation to the Louisiana Sweet Potato Association, research/extension presentation to the St. Landry Parish Sweet Potato Production meeting.

August, 2005 - “Sweetpotato Diseases” - National Crop Insurance Society, sweetpotato adjusters

January, 2004 - “Sweetpotato Virus Research Plans” - National Sweetpotato Council April, 2002 - “Sweetpotato Viruses in the Southeast” - Southern Plant Board February, 2000 - “Sweetpotato Diseases” - Alabama Sweet Potato Association. January, 1999 - “Sweetpotato Disease Research” - 37th Annual Meeting of the Sweet

Potato Council of the United States, Inc. February, 1999 - “Virus-tested Sweetpotato Production” - Louisiana Dept. Agric. For.,

Inspectors Training Session. April, 1998 - “Sweetpotato Disease Identification and Management” - Extension Agents

Training Meeting. January, 1991 - "Biology and Control of Streptomyces ipomoea in Louisiana" - National

Sweetpotato Collaborators annual meeting. January, 1991 - "Bacterial Soft Rot in Sweetpotatoes - A Potential Problem" - 54th

Annual Meeting, Louisiana Sweetpotato Association. January, 1990 - "Sweetpotato Chlorotic Leaf Distortion/Fusarium lateritium, A Novel

Plant/Fungus Interaction?" - Dept. Plant Pathology & Crop Physiology, LSU February, 1989 - "Research on Soybean Delayed Maturity" - CENLA Soybean Agent

Training Meeting, Opelousas, LA. July, 1988 - Quarantine Programs - Sweetpotato - USDA Crop Advisory Committee

Chairs Meeting, Beltsville, MD. February, 1988 - "Update on Research Involving the Green Bean Problem (Delayed


Maturity of Soybeans" - Soybean Agent Training Meeting, West Monroe, LA. April, 1985 - "Sweet Potato Diseases" - Dept. Plant Pathology, Cornell

University April, 1985 - "Sweet Potato Viruses" - Dept. Plant Pathology, New York

State Agricultural Experiment Station, Geneva March, 1984 - "Sweet Potato Viruses" - Dept. Horticulture. LSU January, 1984 - "Sweet Potato Disease Control" - Alabama Sweet Potato

Association September, 1983 - "Sweet Potato Viruses" - Dept. Plant Pathology &

Crop Physiology, LSU

PUBLICATIONS I. Books

Clark, C. A., and Moyer, J. W. 1988. Compendium of Sweet Potato Diseases. APS Press, The American Phytopathological Society, St. Paul, MN. 74 pp.

Clark, C. A., Ferrin, D. M., Smith, T. P., and Holmes, G. J., eds. 2013. Compendium of

Sweetpotato Diseases, Pests, and Disorders, Second Edition. APS Press, The American Phytopathological Society, St. Paul, MN. 160 pp.

II. Book and Proceedings Chapters

Clark, C. A., and J. W. Lorbeer. 1976. Development of Botrytis squamosa and B. cinerea on the surface of onion leaves as affected by exogenous nutrients and epiphytic bacteria. In: (C. H. Dickinson & T. F. Preece, eds.), "Microbiology of Aerial Plant Surfaces." Academic Press, London. pp. 607-625.

Hammett, H. L., Hernandez, T. P., Martin, W. J., and Clark, C. A. 1982. Breeding sweet

potato for disease resistance. In: (R. L. Villareal, ed.) Sweet Potato, Proceedings of the First International Symposium. Asian Vegetable Research and Development Center. pp. 321-329.

Clark, C. A. 1988. Principal bacterial and fungal diseases of sweet potato and their

control. pp. 275-289, in; Exploration, Maintenance, and Utilization of Sweet Potato Genetic Resources. Centro Internacional de la Papa, Lima, Peru. 369 pp.

Clark, C. A., Moyer, J. W., and Dukes, P. D. 1992. Diseases. Pages 88-105 in:

Jones, A., and Bouwkamp, J. C., eds., Fifty Years of Collaborative Sweet Potato Research, 1939-1989. Southern Cooperative Series, Bull. No. 369.

Clark, C. A. 1992. Postharvest diseases of sweet potatoes and their control. Postharvest

News and Information 3:75N-79N.


Clark, C. A., and La Bonte, D. R. 1992. Disease factors in breeding and biotechnology

for sweetpotato. Pages 484-494, in: Hill, W. A., Bonsi, C. K., and Loretan, P. A., Eds., Proceedings of an International Symposium on Sweetpotato Technology for the 21st Century. Tuskegee, AL, June 2-6, 1991.

Clark, C. A. 1998. Prospects and problems in managing sweetpotato diseases. Pages

323-333 in: Proc., Internat. Workshop on Sweetpotato Production System toward the 21st Century, Dec. 9-10, 1997, Miyakonojo, Miyazaki, Japan.

Clark, Christopher. 2000. Sweetpotato black rot. Pages 992-992 in: Maloy, O. C., and

Murray, T. D., eds. Encyclopedia of Plant Pathology. John Wiley & Sons, Inc.

Loria, R., Clark, C. A., Bukhalid, R. A., and Fry, B. A. 2001. III. Gram-positive bacteria. B. Streptomyces. Pages 236-249 in: Schaad, N. W., Jones, J. B., and Chun, W., eds. Laboratory Guide for Identification of Plant Pathogenic Bacteria, 3rd Edition. APS Press, The American Phytopathological Society, St. Paul, MN.

Clark, C. A., and Valverde, R. A. 2001. Viruses and sweetpotato cultivar decline in

Louisiana, USA. Pages 62-69 in; Nakazawa, Y., and Ishiguro, K., eds. International Workshop on Sweetpotato Cultivar Decline Study, Proceedings, Kyushu National Agricultural Experiment Station, Miyakonjo, Japan.

Valverde, R. A., Lotrakul, P., and Clark, C. A. 2001. Properties and variability of

Sweetpotato leaf curl virus. Pages 82-84, in; Nakazawa, Y., and Ishiguro, K., eds. International Workshop on Sweetpotato Cultivar Decline Study, Proceedings, Kyushu National Agricultural Experiment Station, Miyakonjo, Japan.

Clark, C. A., Hoy, M. W., Valverde, R. A., La Bonte, D. R., and Cannon, J. M. 2002.

Effects of viruses on sweetpotatoes in Louisiana, USA. Pages 238-241 in; Nakatani, M., and Komaki, K., eds. Potential of Root Crops for Food and Industrial Resources, Proc. Twelfth Symp. Internat. Soc. Trop. Root Crops, Sept. 10-16, 2000, Tuskuba, Japan.

Clark, C. A., Valverde, R. A., Fuentes, S., Salazar, L. F., and Moyer, J. W. 2002.

Research for improved management of sweetpotato pests and diseases: Cultivar decline. Pages 103-112 in; Ames, T., ed. Proc. 1st Internat. Symp. on Sweetpotato, Acta Hort. 583.

Lotrakul, P., Valverde, R. A., Clark, C. A., Hurtt, S., and Hoy, M. W. 2002.

Sweetpotato leaf curl virus and related geminiviruses in sweetpotato. Pages 135-141 in; Ames, T., ed. Proc. 1st Internat. Symp. on Sweetpotato, Acta Hort. 583.

Valverde, R. A., Clark, C. A., Kokkinos, C. D., and Gutierrez, D. L. 2006. Molecular

methods for diagnosis of sweet potato viral diseases. Pages 251-272 in;


Molecular Diagnosis of Plant Viruses, Govin P. Rao, editor, Studium Press,LLC, Houston, TX.

Valverde, R. A., Clark, C. A., and Valkonen, J. P. T. 2007. Viruses and virus disease

complexes of sweetpotato. Plant Viruses 1(1): 116-126.

Clark, C. A., Holmes, G. J., and Ferrin, D. M. 2009. Chapter 7, Major fungal and bacterial diseases. Pages 81-103; In Loebenstein, G., and Thottappilly, G., eds. The Sweetpotato. Springer.

Clark, C. A., Davis, J. A., Abad, J. A., Cuellar, W., Fuentes, S., Kreuze, J., Gibson, R.,

Mukasa, S. B., Tugume, A. K., Tairo, F., and Valkonen, J. P. T. 2012. Sweetpotato viruses: 15 years of progress on understanding and managing complex diseases. Plant Dis. 96:168-185. doi/pdfplus/10.1094/PDIS-07-11-0550.

III. In Refereed Journals

Clark, C. A., and J. W. Lorbeer. 1973. Symptomatology, etiology, and histopathology of Botrytis brown stain of onion. Phytopathology 63: 1231-1235.

Clark, C. A., and J. W. Lorbeer. 1975. The role of phenols in Botrytis brown stain of

onion. Phytopathology 65: 338-341.

Clark, C. A., and J. W. Lorbeer. 1976. Comparative histopathology of Botrytis squamosa and B. cinerea on onion leaves. Phytopathology 66: 1279-1289.

Clark, C. A., and J. W. Lorbeer. 1977. The role of phyllosphere bacteria in pathogenesis

by Botrytis squamosa and B. cinerea on onion leaves. Phytopathology 67: 96-100.

Clark, C. A., and J. W. Lorbeer. 1977. Comparative nutrient dependency of Botrytis

squamosa and B. cinerea for germination of conidia and pathogenicity on onion leaves. Phytopathology 67: 212-218.

Clark, C. A., J. N. Sasser, and K. R. Barker. 1978. Elutriation procedures for

quantitative assay of soils for Rhizoctonia solani. Phytopathology 68: 1234-1236.

Clark, C. A. 1980. End rot, surface rot, and stem lesions caused on sweet potato by Fusarium solani. Phytopathology 70:109-112.

Clark, C. A., and A. Lawrence. 1981. Morphology of spore-bearing structures in

Streptomyces ipomoea. Can. J. Microbiol. 27:575-579.

Clark, C. A., A. Lawrence, and F. A. Martin. 1981. Accumulation of furanoterpeniods

http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PDIS-07-11-0550


in sweet potato tissue following inoculation with different pathogens. Phytopathology 71:708-711.

Clark, C. A. and V. L. Wright. 1983. Effect and reproduction of Rotylenchulus

reniformis on sweetpotato selections. J. Nematol. 15: 197-203.

Thomas, R. J. and C. A. Clark. 1983. Population dynamics of Meloidogyne incognita and Rotylenchulus reniformis alone and in combination, and their effects on sweetpotato. J. Nematol. 15: 204-211.

Thomas, R. J. and C. A. Clark. 1983. Effects of concomitant development on

reproduction of Meloidogyne incognita and Rotylenchulus reniformis on sweetpotato. J. Nematol. 15:215-221.

Clark, C. A. and B. Watson. 1983. Susceptibility of weed species of Convolvulaceae to

root-infecting pathogens of sweet potato. Plant Disease 67: 907-909.

Derrick, K. S., R. C. French, C. A. Clark, and C. J. Gabriel. 1984. Detection of double-stranded RNA by serologically specific electron microscopy. J. Virological Methods 9:293-299.

Lawrence, G. W., C. A. Clark, and V. L. Wright. 1986. Influence of Meloidogyne

incognita on resistant and susceptible sweet potato cultivars. J. Nematol. 18:59-65.

Lawrence, G. W., and Clark, C. A. 1986. Infection and morphological development of

Meloidogyne incognita in roots of susceptible and resistant sweet potato cultivars. Plant Disease 70:545-547.

Clark, C. A., Randle, W. M., and Pace, C. S. 1986. Reactions of sweet potato selections

to Fusarium root and stem canker caused by Fusarium solani. Plant Disease 70:869-871.

Clark, C. A., Derrick, K. S., Pace, C. S., and Watson, B. 1986. A survey of wild

Ipomoea spp. as potential reservoirs of sweet potato feathery mottle virus in Louisiana. Plant Disease 70:931-932.

Clark, C. A., and Matthews, S. W. 1987. Histopathology of sweet potato root infection

by Streptomyces ipomoea. Phytopathology 77:1418-1423.

Rolston, L. H., Clark, C. A., Cannon, J. M., Randle, W. M., Riley, E. G., Wilson, P. W., and Robbins, M. L. 1987. 'Beauregard' sweet potato. HortScience 22:1338-1339.

Lo, J-Y., and Clark, C. A. 1988. Sources of inoculum and infection courts of Diplodia


gossypina on sweet potato. Phytopathology 78:1442-1446.

Clark, C. A. 1989. Influence of volatiles from healthy and decaying sweet potato storage roots on sclerotial germination and hyphal growth of Sclerotium rolfsii. Can. J. Bot. 67:53-57.

Clark, C. A., Wilder-Ayers, J. A., and Duarte, V. 1989. Resistance of sweet potato to

bacterial root and stem rot caused by Erwinia chrysanthemi. Plant Dis. 73:984-987.

Valverde, R. A., Provvidenti, R., and Clark, C. A. 1990. Cucumber mosaic virus and

desmodium yellow mottle virus infections in wild groundnut (Apios americana). Plant Dis. 74:151-153.

Clark, C. A., Valverde, R. A., Wilder-Ayers, J. A., and Nelson, P. E. 1990. Fusarium

lateritium, causal agent of sweetpotato chlorotic leaf distortion. Phytopathology 80:741-744.

Duarte, V., and Clark, C. A. 1992. Presence on sweetpotato through the growing season

of Erwinia chrysanthemi, cause of stem and root rot. Plant Dis. 76:67-71.

Clark, C. A. 1992. Histological evidence that Fusarium lateritium is an exopathogen on sweetpotato with chlorotic leaf distortion. Phytopathology 82:656-663.

La Bonte, D. R., Mulkey, W. A., Clark, C. A., Rolston, L. H., Cannon, J. M., Wilson, P.

W., and St. Amand, P. C. 1992. 'Hernandez' sweetpotato. HortScience 27:377.

Duarte V., and Clark, C. A. 1993. Interaction of Erwinia chrysanthemi and Fusarium solani on sweetpotato. Plant Dis. 77:733-735.

Clark, C. A. 1994. The chlorotic leaf distortion pathogen, Fusarium lateritium, cross

protects sweetpotato against Fusarium wilt caused by Fusarium oxysporum f. sp. batatas. Biological Control 4:59-66.

Clark, C. A., and Hoy, M. W. 1994. Isolation of Fusarium lateritium from sweetpotato

seed. Plant Disease 78:585-587.

Rolston, L. H., La Bonte, D. R., Mulkey, W. A., Clark, C. A., Cannon, J. M., and Wilson, P. W. 1994. L86-33 sweetpotato germplasm. HortScience 29:712.

Clark, C. A., and Hoy, M. W. 1994. Identification of resistance in sweetpotato to

Rhizopus soft rot using two inoculation methods. Plant Dis. 78:1078-1082.

Dangler, J. M., Scheuerman, R. W., Campbell, R. N., and Clark, C. A. 1994. Meristem-tip culture and California's clean foundation sweetpotato program.


HortTechnology 4:227-228.

Rolston, L. H., La Bonte, D. R., Mulkey, W. A., Clark, C. A., Cannon, J. M., and Wilson, P. W. 1995. 'Darby' sweetpotato. HortScience 30:398-399.

Clark, C. A., Hoy, M. W., and Nelson, P. E. 1995. Variation among isolates of

Fusarium lateritium from sweetpotato for pathogenicity and vegetative compatibility. Phytopathology 85:624-629.

Nelson, P. E., Juba, J. H., and Clark, C. A. 1995. An unusual strain of Fusarium

lateritium affecting sweetpotato. Mycologia 87:507-509.

Tillman, B. L., Harrison, S. A., Russin, J. S., and Clark, C. A. 1996. Relationship between the black chaff and bacterial streak symptoms caused by Xanthomonas campestris pv. translucens in winter wheat. Crop Sci. 36:74-78.

Kim, B. K., La Bonte, D. R., and Clark, C. A. 1996. Studies on sweetpotato with

chlorotic leaf distortion, caused by Fusarium lateritium. Internat. J. Pest Management 42:67-70.

Kim, B. K., La Bonte, D. R., Clark, C. A., and Buteler, M. I. 1996. Heritability

estimates for resistance reaction to sweetpotato chlorotic leaf distortion caused by Fusarium lateritium. HortScience 31:433-435.

Tillman, B. L., Harrison, S. A., Clark, C. A., Milus, E. A., and Russin, J. S. 1996.

Evaluation of bread wheat germplasm for resistance to bacterial streak. Crop Sci. 36:1063-1068.

Buffone, F. A., La Bonte, D. R., and Clark, C. A. 1996. Random amplified

polymorphic DNA markers in sweetpotato infected with Fusarium lateritium. HortScience 31:1215-1216.

Clark, C. A., Hoy, M. W., Bond, J. P., Chen, C., Goh, Y.-K., Liang, X., Liu, X., and

Lotrakul, P. 1997. First report of Erwinia carotovora subsp. carotovora causing bacterial root rot of sweetpotato (Ipomoea batatas) in Louisiana. Plant Dis. 82:129.

Clark, C. A., Hyun, J-W., and Hoy, M. W. 1998. Relationships among wilt-inducing

isolatesof Fusarium oxysporum from sweetpotato and tobacco. Plant Dis. 82:530-536.

Clark, C. A., Chen, C., Ward-Rainey, N., and Pettis, G. S. 1998. Diversity within

Streptomyces ipomoeae based on inhibitory interactions, rep-PCR, and plasmid profiles. Phytopathology 88:1179-1186.


Lotrakul, P., Valverde, R. A., Clark, C. A., Sim, J., and De La Torre, R. 1998. Detection of a geminivirus infecting sweetpotato in the United States. Plant Dis. 82:1253-1257.

Hyun, J-W., and Clark, C. A. 1998. Analysis of Fusarium lateritium using RAPD and

rDNA RFLP techniques. Mycol. Res. 102:1259-1264.

Tubajika, K. M., Tillman, B. L., Russin, J. S., Clark, C. A., and Harrison,S. A. 1998. Relationship between flag leaf symptoms caused by Xanthomonas translucens pv. translucens and subsequent seed transmission in wheat. Plant Dis. 82:1341-1344.

Harrison, H. F., Peterson, J. K., Clark, C. A., and Snook, M. E. 2001. Sweetpotato

periderm components inhibit in vitro growth of root rotting fungi. Hortscience 36: 927-930.

Holmes, G. J., and Clark, C. A. 2002. First report of Geotrichum candidum as a

pathogen of sweetpotato storage roots from flooded fields in North Carolina and Louisiana. Plant Disease 86:695.

Lotrakul, P., Valverde, R. A., and Clark, C. A. 2003. Properties of a begomovirus

isolated from sweet potato [Ipomoea batatas (L.) Lam.] infected with Sweet potato leaf curl virus. Revista Mexicana de Fitopatologia 21:128-136.

Zhang, X., Clark, C. A., and Pettis, G. S. 2003. Interstrain inhibition in the sweet potato

pathogen Streptomyces ipomoeae: Purification and characterization of a highly specific bacteriocin and cloning of its structural gene. Appl. Environ. Microbiol. 69:2201-2208.

Villordon, A. Q., Cannon, J. M., Carroll, H. L., Franklin, J. W., Clark, C. A., and

LaBonte, D. R. 2003. Sweetpotato ‘Beauregard’ mericlones vary in yield, vine characteristics, and storage root size and shape attributes. HortScience 38:1089-1092.

Souto, E. R., Sim, J. Chen, J., Valverde, R. A., and Clark, C. A. 2003. Properties of

Strains of Sweet potato feathery mottle virus and Two Newly Recognized Potyviruses Infecting Sweet Potato in the United States. Plant Disease 87:1226-1232.

LaBonte, D. R., Cannon, J. M., Clark, C. A., Villordon, A. Q., Wilson, P. W., Hammond,

A. H., and Story, R. N. 2003. 'Bienville' sweetpotato. Hortscience 38:473-474.

La Bonte, D., Clark, C., Villordon, A., Cannon, J., Hoy, M., Sistrunk, M., Freeman, E., and Roberts, G. 2004. Yield of four generations of virus-tested sweetpotato. HortTechnology 14:1-3.


Carroll, H.W., Villordon, A.Q., Clark, C.A., La Bonte, D.R., and Hoy, M.W. 2004. Studies on Beauregard sweetpotato clones naturally infected with viruses. Int. J. Pest. Mgmt. 50:101-106.

Mcharo, M., LaBonte, D. R., Clark, C., Hoy, M., and Oard, J. H. 2005. Molecular

marker variability for southern root-knot nematode resistance in sweetpotato. Euphytica 144:125-132.

Clark, C. A., and Hoy, M. W. 2006. Effects of common viruses on yield and quality of

Beauregard sweetpotato in Louisiana. Plant Dis. 90:83-88.

Clark, C. A. 2006. Sweetpotato Diseases: Ecology and Control. Encyclopedia of Pest Management 1(1). <http://www.dekker.com/sdek/abstract~db=enc~content=a713623781>. Accessed 2006 May 03.

Kokkinos, C. D., and Clark, C. A. 2006. Real-time PCR assays for detection and

quantification of sweetpotato viruses. Plant Dis.:90:783-788.

Miano, D. W., LaBonte, D. R., Clark, C. A., Valverde, R. A., Hoy, M. W., Hurtt, S., and Li,R. 2006. First Report of a Begomovirus Infecting Sweetpotato in Kenya. Plant Dis. 90:832.

Kokkinos, C. D., and Clark, C. A. 2006. Interactions among Sweet potato chlorotic stunt

virus and different potyviruses and potyvirus strains infecting sweetpotato in the United States. Plant Dis. 90:1347-1352.

Kokkinos, C. D., Clark, C. A., McGregor, C. E., and LaBonte, D. R. 2006. The effect of

sweet potato virus disease and its viral components on gene expression levels in sweetpotato. J. Amer. Soc. Hort. Sci. 131:657-666.

Miano, D. W., LaBonte, D. R., and Clark, C. A. 2008. Identification of molecular

markers associated with sweet potato resistance to sweet potato virus disease in Kenya. Euphytica 160:15–24.

LaBonte, D. R., Wilson, P. W., Villordon, A. Q., and Clark, C. A. 2008. 'Evangeline'

sweetpotato. HortScience 43:258-259.

LaBonte, D. R., Villordon, A. Q., Clark, C. A., Wilson, P. W., and Stoddard, C. S. 2008. 'Murasaki-29' sweetpotato. HortScience 43:1895-1896.

Sim, J., Valverde, R., Clark, C., and Chun, S-C. 2008. Virus-like particles and cellular

changes in plants infected with sweetpotato viruses. Plant Pathol. J. 24:36-45. McGregor, C., Miano, D., LaBonte, D., Hoy, M., and Clark, C. 2009. The effect of the


sequence of infection of the causal agents of sweet potato virus disease on symptom severity and individual virus titres in sweet potato cv. Beauregard. J. Phytopathology 157:514–517.

Villordon, A., C. Clark, D. Ferrin, and D. LaBonte. 2009. Using growing degree days,

agrometeorological variables, linear regression, and data mining methods to help improve prediction of sweetpotato harvest data in Louisiana. HortTechnology 19:133-144.

Nandakumar, R., Shahjahan, A. K. M., Yuan, X. L., Dickstein, E. R., Groth, D. E., Clark,

C. A., Cartwright, R. D., and Rush, M. C. 2009. Burkholderia glumae and B. gladioli cause bacterial panicle blight in rice in the southern United States. Plant Dis. 93:896-905.

McGregor, C. E., Miano, D. W., LaBonte, D. R., Hoy, M., Clark, C. A., and Rosa, G. J.

M. 2009. Differential gene expression of resistant and susceptible sweetpotato plants after infection with the causal agents of sweet potato virus disease. J. Amer. Soc. Hort. Sci. 134:658–666.

Villordon, A., Clark, C., Smith, T., Ferrin, D., and LaBonte, D. 2010. Combining linear

regression and machine learning approaches to identify consensus variables related to optimum sweetpotato transplanting date. HortScience 45:684–686.

Clark, C. A., Smith, T. P., Ferrin, D. M., and Villordon, A. Q. 2010. Performance of

sweetpotato foundation seed after incorporation into commercial operations in Louisiana. HortTechnology 20:977-982.

Villordon, A., J. Solis, C. Clark, and D. Labonte. 2010. Development of a prototype

Bayesian network model representing the relationship between fresh market yield and some agroclimatic variables known to influence storage root initiation in sweetpotato. HortScience 45:1167-1177.

Miano, D. W., Labonte, D. R., and Clark, C. A. 2010. Irregular distribution of viruses

in field-grown sweetpotato cuttings and its significance in propagation by small-holder farmers in Kenya. E. Afr. Agric. For. J. 77(1):1-9.

La Bonte, D. R., Clark, C. A., Smith, T. P., and Villordon, A. Q. 2011. ‘Bonita’

sweetpotato. HortScience 46:948–949. Guan, D., Grau, B. L., Clark, C. A., Taylor, C. M., Loria, R., and Pettis, G. S. 2011.

Evidence that thaxtomin C is a pathogenicity determinant of Streptomyces ipomoeae, the causative agent of Streptomyces soil rot disease of sweetpotato. Mol. Plant Microbe Interact. 25:393-401.

Wosula, E. N., Clark, C. A., and Davis, J. A. 2012. Effect of host plant, aphid species,


and virus infection status on transmission of Sweetpotato feathery mottle virus. Plant Dis. 96:1331-1336.

Villordon, A., Clark, C., LaBonte, D., and Firon, N. 2012. 1-Methylcyclopropene Has a

variable effect on adventitious root emergence from cuttings of two sweetpotato cultivars. HortScience 47:1764–1767.

Wosula, E. N., Davis, J. A., Clark, C. A., Smith, T. P., Arancibia, R. A., Musser, F. R.

and Reed, J. T. 2013. The role of aphid abundance, species diversity and virus titer in the spread of sweetpotato potyviruses in Louisiana and Mississippi. Plant Dis. 97:53-61.

Arancibia, R. A., Main, J. L., and Clark, C. A. 2013. Sweetpotato tip rot incidence is

increased by preharvest applications of ethephon and reduced by curing. HortTechnology 23:288-293.

Wosula, E. N., Davis, J. A., and Clark, C. A. 2013. Population dynamics of three aphid

species (Hemiptera: Aphididae) on four Ipomoea spp. infected or noninfected with sweetpotato potyviruses. J. Econ. Entomol. 106:1566-1573.

IV. Extension Bulletins –

Edmunds, B., Boyette, M., Clark, C., Ferrin, D., Smith, T., and Holmes, G. 2008. Postharvest Handling of Sweetpotatoes. Bulletin AG-413-10-B published by North Carolina Extension Service. 56 pp.

V. Abstracts of papers presented at scientific meetings -

Clark, C. A., and Lorbeer, J. W. 1973. Reaction of Allium cepa to Botrytis brown stain. Phytopathology 63:200.

Clark, C. A., and Lorbeer, J. W. 1976. Histopathology of Botrytis squamosa and B.

cinerea on onion leaves. Proc. Amer. Phytopathol. Soc. 2:66.

Clark, C. A. 1979. Surface rot and proximal end rot of sweet potato caused by Fusarium solani. Phytopathology 69:526.

Clark, C. A., and Thomas, R. J. 1979. Extraction of reniform nematode eggs for

inoculum or estimation of field populations. Phytopathology 69:526.

Clark, C. A., Wright, V. L., and Miller, R. L. 1980. Reaction of some sweet potato selections to the reniform nematode, Rotylenchulus reniformis. J. Nematol. 12:218.


Thomas, R. J., and Clark, C. A. 1980. Interactions between Meloidogyne incognita and

Rotylenchulus reniformis on sweet potato. J. Nematol. 12:230.

Clark, C. A., Lawrence, A., and Martin, F. A. 1980. Accumulation of furanoterpenoids in sweet potatoes in response to various pathogens. Phytopathology 71:208-209.

Thomas, R. J., and Clark, C. A. 1981. Meloidogyne incognita and Rotylenchulus

reniformis interactions in a sweet potato field. Phytopathology 71:908.

Lawrence, G. W., and Clark, C. A. 1982. Reaction of resistant and susceptible sweet potato cultivars to population densities of Meloidogyne incognita. J. Nematol. 14:453.

Thomas, R. J., and Clark, C. A. 1982. Concomitant reproduction and population

dynamics of Meloidogyne incognita and Rotylenchulus reniformis on sweet potato. J. Nematol. 14:472-473.

Clark, C. A., Derrick, K. S., Strand, C., and Watson, B. 1985. Morning glories as

perennial reservoirs of Sweet Potato Feathery Mottle Virus. Phytopathology 75:499.

Lo, J-y., and Clark, C. A. 1985. Inoculation of sweet potato by the Java black rot

pathogen, Diplodia gossypina. Phytopathology 75:501.

Lawrence, G. W., Clark, C. A., and Wright, V. L. 1985. The role of sweet potato resistance on development of Meloidogyne incognita. HortScience 20:655.

Derrick, K. S., Chang, S. H., French, R. C., and Clark, C. A. 1985. The effect of sucrose

on spot hybridization assays for sugarcane mosaic virus. Phytopathology 75:1353-1354.

Lawrence, G. W., and Clark, C. A. 1986. Identification, race determination, and

pathogenicity of root knot nematodes to resistant and susceptible sweet potatoes. J. Nematol. 18:617.

Clark, C. A., and Pace, C. S. 1987. Screening for sweet potato storage root reaction to

Erwinia chrysanthemi. Phytopathology 77:1712.

Destefano-Beltran, L. J. C., Jaynes, J. M., and Clark, C. 1987. Effect of novel lytic peptides on plant pathogenic bacteria. Phytopathology 77:1768.

Clark, C. A. 1988. Effects of volatiles from healthy and decaying sweet potato on

Sclerotium rolfsii. Abstracts, 5th Internat. Congr. Plant Pathology, Kyoto, Japan, August 20-27, 1988. #V-2-93, p. 200.


Destefano-Beltran, L. J. C., Moriconi, D. N., Clark, C., and Jaynes, J. 1988. A different

approach for improving bacterial disease resistance in plants. presented at Southern Regional meeting, Amer. Soc. Microbiol., Nov. 5, 1988.

Valverde, R. A., Provvidenti, R., and Clark, C. A. 1989. Desmodium yellow mottle

virus and cucumber mosaic virus infecting wild groundnut (Apios americana). Phytopathology 79:1197.

Clark, C. A., Valverde, R. A., Wilder-Ayers, J. A., and Nelson, P. E. 1990. Fusarium

lateritium causes sweetpotato chlorotic leaf distortion. HortScience 25:855.

Clark, C. A., Wilder-Ayers, J. A., and Matthews, S. W. 1990. Shoot-tip mucilage and distribution of Fusarium lateritium on sweetpotato. Phytopathology 80:892.

Duarte, V., and Clark, C. A. 1990. Pectolytic clostridia associated with souring of

sweetpotato. Phytopathology 80:1002.

Duarte, V., and Clark, C. A. 1990. Presence of Erwinia chrysanthemi, causal agent of stem and root rot, on sweetpotato through the growing season. Phytopathology 80:583.

Brady, W., Clark, C. A., and Harrison, S. A. 1991. Effect of bacterial streak on wheat

yield and variation in genotypic response to infection.

Clark, C. A., Hoy, M. W., and Stine, B. S. 1992. Isolation of Fusarium lateritium from sweetpotato true seed from different countries. Phytopathology 82:1073.

Clark, C. A. 1992. Variability of Streptomyces ipomoeae for cultural characteristics,

pathogenicity, interaction phenotypes, and plasmid profiles. Phytopathology 82:1125.

Clark, C. A., and Hoy, M. W. 1993. Sweetpotato chlorotic leaf distortion: An unusual

"disease" caused by Fusarium lateritium. Program of the VIIth International Fusarium Workshop, July 19-23, 1993, Pennsylvania State University, p. 31.

Clark, C. A., Hoy, M. W., Nelson, P. E., and McCormack, S. 1993. Diversity among

isolates of Fusarium lateritium from sweetpotato. Abstracts of the 6th International Congress of Plant Pathology, July 28-August 6, 1993, Montreal, Canada. Abstract no. 8.1.17, p. 132.

Tillman, B. L., Russin, J. S., Harrison, S. A., and Clark, C. A. 1993. Relationship among

symtpoms of bacterial streak of wheat caused by Xanthomonas campestris pv. translucens and their correlation to yield. Phytopathology 83:1387.


Tillman, B. L., Kursell, W. S., Harrison, S. A., Russin, J. S., and Clark, C. A. 1993. Reaction of five F2 derived wheat populations to bacterial streak in Louisiana. Page 108, Agronomy Abstracts, Madison, WI.

Clark, C. A., and Hoy, M. W. 1994. Evaluating resistance in sweetpotato to Rhizopus

soft rot. Phytopathology 84:1077.

Tubajika, K. M., Russin, J. S., Clark, C. A., and Harrison, S. A. 1995. Spread of Xanthomonas campestris pv. translucens in wheat studied with a rifampicin-resistant strain. Phytopathology 85:1181.

Tubajika, K. M., Tillman, B. L., Russin, J. S., Harrison, S. A., and Clark, C. A. 1996.

Seed transmission and detection of Xanthomonas campestris pv. translucens in wheat. Phytopathology 86:S80.

Clark, C. A., Hyun, J-W., and Hoy, M. W. 1997. Relationships among wilt-inducing

isolates of Fusarium oxysporum from sweetpotato and tobacco. Phytopathology 87:S19.

Hyun, J-W., and Clark, C. A. 1997. Relationships among isolates of Fusarium

lateritium from sweetpotato and other sources. Phytopathology 87:S46.

Sim, J., Valverde, R. A., and Clark, C. A. 1997. Electron microscopy of virus-infected Ipomoea spp. Phytopathology 87:S90.

Souto, E. R., Valverde, R. A., and Clark, C. A. 1997. Detection of sweet potato

feathery mottle virus by RT-PCR using potyvirus specific primers. Phytopathology 87:S93.

Tubajika, K. M., Russin, J. S., Clark, C. A., and Harrison, S. A. 1997. Spread of

Xanthomonas campestris pv. translucens in wheat studied with a rifampicin resistant strain. Phytopathology 87:S98.

Lotrakul, P., Valverde, R. A., Clark, C. A., Sim, J., and De La Torre, R. 1998.

Identification of a geminivirus infecting sweetpotato in the United States. Phytopathology 88:S55.

Clark, C. A., Hoy, M. W., Valverde, R. A., Cannon, J. M., La Bonte, D. R., and Wallace,

H. 1998. Effect of viruses on yield of sweetpotato in Louisiana, 1996-1997. Phytopathology 88:S17.

Villordon, A. Q., C.A. Clark, R.L. Jarret, and D.R. La Bonte. 2000. Detection of

putatively stress-activated Ty1-copia-like retrotransposon sequences in virus-infected sweetpotato (Ipomoea batatas [L.] Poir.) clones. HortSci. 35:399.


Lotrakul, P., Valverde, R. A., Clark, C. A., Hurtt, S., and Hoy, M. W. 2001. Genetic diversity and occurrence of sweet potato begomoviruses. Phytopathology 91(6):S56.

Lotrakul, P., Valverde, R. A., and Clark, C. A. 2001. Properties of a begomovirus

isolated from sweet potato infected with sweet potato leaf curl virus. Phytopathology 91(6):S56.

Kokkinos, C. D., La Bonte, D. R., Villordon, A., and Clark, C. A. 2003. Activation of

retrotransposons in sweetpotato following infection by viruses. The 13th Triennial Symposium of the International Society for Tropical Root Crops, Arusha, Tanzania.

Mcharo, M., Labonte, D. R., Clark, C., and Hoy, M. 2004. Molecular marker variability

for southern root-knot nematode resistance in sweetpotato. Hortscience 39:869.

Clark, C. A., Hoy, M. W., and Kokkinos, C. D. 2004. Yield decline of sweetpotato cultivars and virus infection. Phytopathology 94:S19-20.

Kokkinos, C. D., and Clark, C. A. 2004. Assessment of interactions among important

sweetpotato viruses using real-time quantitative PCR. Phytopathology 94:S54.

Valverde, R. A., Kokkinos, C. D., and Clark, C. A. 2004. Sweet potato leaf curl virus: Detection by molecular hybridization. Phytopathology 94:S105.

Gutierrez, D. L., Valverde, R. A., Clark, C. A., and Hoy, M. W. 2005. Begomoviruses

infecting sweetpotato breeding lines in the United States. Phytopathology 95:S38.

Miano, D. W., LaBonte, D. R., and Clark, C. A. 2006. Sweetpotato virus disease research in East Africa. National Sweetpotato Collaborators Group Progress Report 2005:6.

Miano, D. W., LaBonte, D. R., and Clark, C. A. 2006. Virus distribution in field grown

sweetpotato in Africa. National Sweetpotato Collaborators Group Progress Report 2005:6.

Ling, K. S., Clark, C. A., Kokkinos, C., Bohac, J. R., Hurtt, S. C., Jarret, R. L., and

Gillaspie, A. G. 2006. National Sweetpotato Collaborators Group Progress Report 2005:6-7.

Kokkinos, C. D., McGregor, C. E., Clark, C. A., and LaBonte, D. R. 2006. Molecular

studies of SPVD. National Sweetpotato Collaborators Group Progress Report 2005:7.

Miano, D. W., LaBonte, D. R., and Clark, C. A. 2006. Sweetpotato virus diseases


research in East Africa. HortScience 40:517.

Miano, D. W., LaBonte, D. R., and Clark, C. A. 2006. Virus distribution in field grown sweetpotato vines in Africa. HortScience 40:517.

Ling, K. S., Clark, C. A., Kokkinos, C., Bohac, J. R., Hurtt, S. S., Jarret, R. L., and

Gillaspie, A. G. 2006. An update on evaluation of virus status in the heirloom sweetpotato germplasm materials with real-time PCR technology. HortScience 40:517.

Miano, D., LaBonte, D., and Clark, C. 2006. Detection and distribution of viruses

infecting field-grown sweetpotato in East Africa. HortScience 41:972.

Clark, C. A., and Hoy, M. W. 2007. A tospovirus in the sweetpotato virus complex. Phytopathology 97:S181.

Clark, C. A., Hoy, M. W., McGregor, C. E., Miano, D. W., and LaBonte, D. R. 2007.

Suppression of sweetpotato virus disease by a graft-transmissible agent. Phytopathology 97:S23.

McGregor, C., Miano, D., Hoy, M., Clark, C., and LaBonte, D. 2007. The effect of the

sequence and time-lapse between infection of the causal agents of sweet potato virus disease (SPVD) on symptom development and individual virus titers. Phytopathology 97:S74.

Miano, D. W., LaBonte, D. R., and Clark, C. A. 2007. Identification of DNA markers

linked to resistance or tolerance to sweet potato virus disease in Kenya. Phytopathology 97:S76.

Gillette, C., Thiessen, M., LaBonte, D., Clark, C., and McGregor, C. 2009. Effects of

vine cutback on symptom severity and virus titers of a susceptible and resistant sweetpotato variety. HortScience 44:1123.

Smith, T. P., Clark, C., and Ferrin, D. 2009. Sweetpotato foundation seed survey: Yield

performance of multiple generations of sweetpotato foundation seed in 2007 and 2008. HortScience 44:573.

Guan D., Clark C.A. and Pettis G.S. 2010. A Pathogenicity Determinant of Streptomyces

Soil Rot Disease: Characterization of the Thaxtomin C Biosynthetic Gene Cluster of the Bacterial Sweet Potato Pathogen Streptomyces ipomoeae. Department of Plant Pathology and Crop Physiology, LSU, Baton Rouge, LA, USA, September 2010

Guan D., Grau B.L., Clark C.A., Loria R. and Pettis G.S. 2010. Cloning and

Characterization of the Thaxtomin C Biosynthetic Gene Cluster of the Bacterial


Sweet Potato Pathogen Streptomyces ipomoeae. American Society for Microbiology (ASM) general annual meeting, San Diego, CA, USA, May 2010.

Wosula, E. N., J. A. Davis, and C. Clark. 2010. Host plant-virus interactions on green

peach aphid population dynamics (abstract 0514). Proceedings of the 2010 Annual Meeting of the Entomological Society of America. San Diego, CA. December 13, 2010.

Wosula, E., Clark, C. A., and Davis, J. A. 2011. Potyvirus and insect vector movement

in Louisiana sweetpotato fields. Phytopathology 91:S270. Wosula, E. N., J. A. Davis, and C. Clark. 2011. Effect of Ipomoea host plants on stylet

penetration behavior of Myzus persicae (Sulzer) (abstract 0446). Proceedings of the 2011 Annual Meeting of the Entomological Society of America. Reno, NV. November 14, 2011.

Sweany, R. R., Picha, D. H., and Clark, C. A. 2012. Use of hot-water baths as non-

chemical treatments for Rhizopus soft rot on sweetpotatoes. Phytopathology 102:S2.10.

Wosula, E. N., Clark, C. A., and Davis, J. A. 2012. Host plant, aphid species and virus

infection status influence on acquisition and transmission of Sweet potato feathery mottle virus. Phytopathology 102:S2.11.

Silva, W. L. da, and Clark, C. A. 2012. Infection of sweetpotato by fungal end rot

pathogens prior to harvest. Phytopathology 102:S2.2-2.3. Villordon, A. Q., Firon, N., Clark, C., and LaBonte, D. 2012. An Ethylene Blocker

Delays Epidermal Cell Death At the Location of Adventitious Root Emergence In ‘Beauregard' but Not In ‘Evangeline' Sweetpotato Cuttings", for the American Society for Horticultural Science 2012 Annual Conference

Carey, E. E., Andrade, M., Sweany, R., Clark, C., and Villordon, A. 2013. IBRootNet:

A collaborative platform for distributed sweetpotato root architecture phenotyping for enhanced crop improvement and management. Poster presented at the African Potato Association Conference, June 30-July 4, 2013, Naivasha, Kenya.

VI. Book Reviews -

Clark, C. A. - review of; Coley-Smith, J. R., Verhoeff, K., and Jarvis, W. R., eds. 1982. The Biology of Botrytis. Academic Press. In: Quarterly Review of Biology 57:72.

VII. Other Publications -


Clark, C. A., and Lorbeer, J. W. 1973. Reaction of onion cultivars to Botrytis brown stain. Plant Dis. Reptr. 57:210-214.

Birchfield, W., Clark, C. A., and Martin, W. J. 1978. Miscellaneous nematicides,

different applications, and formulations for control of reniform and spiral nematodes of sweet potatoes, 1977. Fung. Nemat. Tests 33:205.

Birchfield, W., Martin, W. J., and Clark, C. A. 1978. Miscellaneous nematicides for

reniform and spiral nematode control on sweet potatoes, 1977. Fung. Nemat. Tests 33:206.

Martin, W. J., Clark, C. A., and Birchfield, W. 1978. The effects of different

formulations and applications of 2 organophosphate nematicides on reniform and spiral nematodes on sweet potato, 1977. Fung. Nemat. Tests 33:206.

Birchfield, W., and Clark, C. A. 1979. Control of sweet potato nematodes with layby

applications of ethoprop, 1978. Fung. Nemat. Tests 34:206-207.

Clark, C. A., and Birchfield, W. 1979. Control of reniform nematode on sweet potato with aldoxycarb, 1978. Fung. Nemat. Tests 34:207.

Clark, C. A., and Birchfield, W. 1979. Effects of miscellaneous nematicides on reniform

nematode and sweet potato yields, 1978. Fung. Nemat. Tests 34:207.

Hernandez, Teme P., Hammett, H., Constantin, R., Clark, C., Rolston, L., and Jones, L. 1979. Breeding and testing of sweet potatoes in 1978. Pages 35-38 in: Hammett, H., ed., National Sweet Potato Collaborators Group Progress Report, 1978.

Birchfield, W., Clark, C. A., Yik, C-p., and Boniol, D. P. 1980. Transplant water

application of aldoxycarb for nematode control in sweet potato, 1979. Fung. Nemat. Tests 35:222.

Clark, C. A., Birchfield, W., Yik, C-p., and Boniol, D. P. 1980. Application rates and

methods for Nemacur 3 SC for nematode control on sweet potato, 1979. Fung. Nemat. Tests 35:222.

Clark, C. A., Boniol, D. P., and Hammett, H. L. 1980. Control of sweet potato soil rot

with varietal resistance and chemical treatments, 1979. Fung. Nemat. Tests 35:90.

Hernandez, T. P., Constantin, R. J., Hammett, H. L., Martin, W. J., Clark, C., and

Rolston, L. 1980. Travis: An early high-yielding sweet potato cultivar. Louisiana State Univ. and A&M Agric. Expt. Station, Circular 112. 4 pp.

Hernandez, T. P., Constantin, R. J., Hammett, H., Martin, W. J., Clark, C., and Rolston,


L. 1980. Travis: A new sweet potato variety. Louisiana Agric. 23:3, 24.

Hernanez, Teme P., Constantin, R., Hammett, H., Clark, C., Rolston, L., Hebert, J., and Saladaga, F. 1980. Breeding and testing of sweet potatoes in 1979. Pages 30-38 in: Hammett, H., ed., National Sweet Potato Collaborator Group Progress Report, 1979.

Birchfield, W., Clark, C. A., and Watson, B. 1981. Miscellaneous nematicides for

reniform nematode control on sweet potato, 1980. Fung. Nemat. Tests 36:182.

Black, L. L., Clark, C. A., and Overstreet, C. 1981. Soil treatments under plastic film mulch for root-knot nematode control during two consecutive crops, 1979. Fung. Nemat. Tests 36:359.

Clark, C. A., Birchfield, W., and Watson, B. 1981. Layby applications of ethoprop

following preplant applications of ethoprop or ethylene dibromide plus chloropicrin for reniform nematode control on sweet potato, 1980. Fung. Nemat. Tests 36:182.

Clark, C. A., Watson, B., and Hammett, H. L. 1981. Control of sweet potato soil rot

with varietal resistance and chloropicrin, 1980. Fung. Nemat. Tests 36:77.

Hernandez, T. P., Constantin, R., Hammett, H., Martin, W. J., Clark, C., and Rolston, L. 1981. 'Travis' sweet potato. HortScience 16:574.

Scheuerman, R. W., Hernandez, T. P., Martin, W. J., Clark, C., Constantin, R., and

Hammett, H. 1981. 'Eureka' sweet potato. HortScience 16:689.

Hernandez, Teme P., Hammett, H., Constantin, R., Clark, C., Rolston, L., and Saladaga, F. 1981. Breeding and testing of sweet potatoes in 1980. Pages 23-26 in: Hammett, H., ed., National Sweet Potato Collaborators Group Progress Report, 1980.

Scheuerman, R. W., Hernandez, T. P., Martin, W. J., Clark, C., Constantin, R., and

Hammett, H. 1982. 'Eureka', a sweet potato resistant to soil rot (pox). Calif. Agric. 36(1/2):24.

Birchfield, W., Clark, C. A., and Watson, B. 1982. Miscellaneous nematicides for

reniform nematode control on sweet potato. Fung. Nemat. Tests 37:200.

Clark, C. A., Watson, B., and Hammett, H. L. 1982. Control of sweet potato soil rot with resistance and chloropicrin. Fung. Nemat. Tests 37:82.

Hernandez, Teme P., Hammett, H., Picha, D., Wilson, P., Clark, C., and Rolston, L.

1982. Breeding and testing of sweet potatoes in 1981. Pages 25-29 in: Hammett,


H., ed., National Sweet Potato Collaborator Group Progress Report, 1981.

Clark, C. A., Strand, C., and Watson, B. 1983. Comparison of soil fumigant with ethoprop for reniform nematode control in sweet potato. Fung. Nemat. Tests 38:12-13.

Clark, C. A., Strand, C., Watson, B., and Hammett, H. L. 1983. Control of sweet potato

soil rot with chloropicrin. Fung. Nemat. Tests 38:109.

Hernandez, Teme P., Hammett, H., Picha, D., Wilson, P., Clark, C., and Rolston, L. 1983. Breeding and testing of sweet potatoes in 1982. Pages 19-23 in: Hammett, H., ed., National Sweet Potato Collaborator Group Progress Report, 1982.

Randle, B., Clark, C., Rolston, L., Robbins, R., Picha, D., and Wilson, P. 1985. 1984

Sweet Potato Investigations, Louisiana State University, Baton Rouge, Louisiana. Pages 24-28 in: McLaurin, W. J., ed., National Sweet Potato Collaborators Group Progress Report, 1984.

Clark, C. A., Pace, C. S., Randle, W. M., Rolston, L., and Robbins, M. L. 1986.

Evaluation of sweet potato selections for reaction to soil rot and circular spot, 1985. Biol. Cult. Tests Plant Dis. Control 1: .

Randle, B., Clark, C., Rolston, L., and Wilson, P. 1986. 1985 sweet potato investiga-

tions, Louisiana State University, Baton Rouge, Louisiana. Pages 29-33 in: McLaurin, W. J., ed., National Sweet Potato Collaborators Group Progress Report, 1985.

Clark, C. A. 1988. New disease record. International Working Group on Sweet Potato

Viruses, Newsletter, No. 1:3-4.

Rush, M. C., Clark, C. A., and Groth, D. E. 1988. Rice bacterial leaf blight found in Louisiana rice. Poster presented at the Rice Technical Working Group meeting.

Clark, C. A., and Valverde, R. A. 1990. Untitled. Internat. Working Group on Sweet

Potato Viruses, Newsletter, No. 2:2-3.

Clark, C. A., and Mulkey, W. A. 1991. Effect of planting date on soil rot and circular spot development on sweetpotato, 1990. Biol. & Cult. Tests 6:21.

Harrison, S. A., Clark, C. A., and Russin, J. S. 1991. Bacterial streak of wheat. Proc.

So. Small Grain Workers, 22nd Meeting, Overton, TX.

LaBonte, D. R., Mulkey, W. A., Clark, C. A., Rolston, L. H., Cannon, J. M., Wilson, P. W., and St. Amand, P. C. 1992. Hernandez: a new sweetpotato variety. Louisiana Agriculture 35(2):16-17.


Mulkey, W. A., and Clark, C. A. 1992. Effect of planting date on soil rot and circular

spot on sweetpotato, 1991. Biol. & Cult. Tests 7:26.

Clark, C. A., Averre, C. W., Dukes, P. D., Moyer, J. W., Philley, G. L., Ristaino, J. B., and Stevens, C. 1993. Common names for diseases of sweetpotato (Ipomoea batatas (L.) Lam.). http://www.apsnet.org/publications/commonnames/Pages/Sweetpotato.aspx

Clark, C. A., and Mulkey, W. A. 1993. Effect of planting date on Streptomyces soil rot

and circular spot on sweetpotato, 1992. Biol. Cult. Tests 8:34.

Clark, C. A., Cannon, J. M., and Mulkey, W. A. 1993. Evaluation of postharvest chemical dip treatments for control of Rhizopus soft rot in sweetpotato, 1992. Fungicide & Nematicide Tests 48:167.

La Bonte, D. R., Mulkey, W. A., Clark, C. A., Stetina, K. W. 1993. National

Sweetpotato Collaborators Group evaluation. Pages 39-44 in: McLaurin, W. J., ed., The National Sweetpotato Collaborators Group Progress Report, 1992.

Clark, C. A., Hoy, M. W., La Bonte, D. R., and Mulkey, W. A. 1994. Sweetpotato

disease research - 1993. Pages 19-33 in: Sweet Potato Research, LAES Mimeo Series No. 89.

Clark, C. A., Hoy, M. W., La Bonte, D. R., and Mulkey, W. A. 1994. Sweetpotato

disease resistance research - 1992. Pages 34-41 in: Sweet Potato Research, LAES Mimeo Series No. 89.

Clark, C. A., Hoy, M. W., Cannon, J. M., and Mulkey, W. A. 1994. Chemical disease

control research for postharvest and seed treatment - 1992. Pages 42-46 in: Sweet Potato Research, LAES Mimeo Series No. 89.

Clark, C. A., and Hoy, M. W. 1994. Reaction of regional and advanced lines, standard

cultivars and selected cultivars of sweetpotato to Streptomyces soil rot and circular spot, 1993. Biol. Cult. Tests 9:52.

Icochea, T., Duarte, V., and Clark, C. A. 1994. Occurrence of sweetpotato chlorotic leaf

distortion in Brazil and Peru caused by Fusarium lateritium. (Note) Plant Dis. 78:754.

Harrison, S. A., Clark, C. A., Colyer, P. D., Hollier, C. A., Russin, J. S., Tillman, B. L.,

and Thompson, J. D. 1994. Louisiana. Ann. Wheat Newsletter 40:262-265.

La Bonte, D. R., Mulkey, W. A., Clark, C. A., Wilson, P. W., and Romaine, D. J. 1994. National Sweetpotato Collaborators Group evaluation - Louisiana. Pages

http://www.apsnet.org/publications/commonnames/Pages/Sweetpotato.aspx


30-37 in: McLaurin, W. J., ed., The National Sweetpotato Collaborators' Group Progress Report, 1993.

Clark, C. A., and Hoy, M. W. 1994. Evaluation of postharvest chemical dip treatments

for control of Rhizopus soft rot in sweetpotato, 1993. Fungicide and Nematicide Tests 49:155.

Clark, C. A., Hoy, M. W., and Mulkey, W. A. 1994. Evaluation of fungicidal 'seed' root

treatments for control of sclerotial blight and plant production in sweetpotato, 1993. Fungicide and Nematicide Tests 49:156.

Rolston L. H., La Bonte, D. R., Clark, C. A., Wilson, P. W., Mulkey, W. A., and Cannon,

J. M. 1994. Darby: a new sweet potato variety. Louisiana Agriculture 37(4):19.

Clark, C. A., and Hoy, M. W. 1995. Reaction of regional lines and selected cultivars of sweetpotato to Streptomyces soil rot and circular spot, 1994. Biol. Cult. Tests 10:152.

Harrison, S. A., Clark, C. A., Colyer, P. D., Hollier, C. A., Russin, J. S., Schneider, R.

W., Tillman, B. L., and Thompson, J. D. 1995. Louisiana. Annu. Wheat Newsl., Kansas Agric. Expt. Sta. 41:259-261.

Braverman, M. P., Clark, C. A., and La Bonte, D. R. 1995. Effect of simulated

glyphosate drift on sweet potatoes. Proc., La. Plant Prot. Assoc. 5:22.

Clark, C. A., Hoy, M. W., and Mulkey, W. A. 1995. Evaluation of fungicidal ‘seed’ root treatments for control of sclerotial blight and effect on plant production in sweetpotato, 1994. Fung. Nemat. Tests 50:163.

Clark, C. A., and Hoy, M. W. 1995. Evaluation of postharvest chemical dip treatments

for control of Rhizopus soft rot in sweetpotato, 1994. Fung. Nemat. Tests 50:164.

Sim, J., Valverde, R. A., and Clark, C. A. 1997. Electron microscopy of virus infected sweetpotato. Louisiana Plant Prot. Assoc.

Souto, E. R., Valverde, R. A., and Clark, C. A. 1997. Identification of potyviruses

infecting sweetpotato using PCR. Louisiana Plant Prot. Assoc.

Clark, C. A., and Valverde, R. A. 1997. Status of sweet potato virus research. Tater Talk 3(1):3-4.

La Bonte, D. R., Romaine, D. J., Cannon, J. M., Clark, C. A., Wilson, P. A., and

Freeman, E. 1997. National Sweetpotato Collaborators Group Evaluation - Louisiana. National Sweetpotato Collaborators Group Progress Report 1997, pp. 21-22.


Clark, C. A., Hoy, M. W., and Valverde, R. A. 1997. The evolving disease situation for

sweet potatoes. Louisiana Agriculture 40:15-19.

Valverde, R. A., and Clark, C. A. 1997. Whiteflies transmit new virus disease in Louisiana sweet potatoes. Louisiana Agriculture 40:28-29.

Buckley, B., III and C.A. Clark. 1997. Reaction of cowpea cultivars, breeding lines, and

PI's tobacterial blight. HortScience 32:606.

Clark, C. A., and Braverman, M. P. 1998. Herbicide damage on Beauregard. Tater Talk 4(1):4.

Lotrakul, P., Valverde, R. A., and Clark, C. A. 1999. Sweetpotato leaf curl virus. Proc.

Louisiana Plant Prot. Assoc. & Louisiana Assoc. Agron., April 5-6. 1999, p. 45.

Shajahan, A. K. M., Groth, D. E., Clark, C. A., Linscombe, S. D., and Rush, M. C. 2000. Epidemiological studies on panicle blight of rice: Critical stage of infection and the effect of infected seeds on disease development and yield of rice. Proc. Rice Tech. Work. Group 28:77. (Biloxi, MS: Feb. 27 - March 1, 2000).

Sim, J., Valverde, R. A., and Clark, C. A. 2000. Whitefly transmission of Sweetpotato

chlorotic stunt virus. Plant Dis. 84:1250. Clark, C. A. 2000. Streptomyces ipomoeae. Datasheet for Global Crop Protection

Compendium on CD-ROM. CAB International, Wallingford, UK. (Note: authorship is not indicated on these datasheets, see http://pest.cabweb.org/cpc/cpcframe.asp).

Shajahan, A. K. M., Rush, M. C., Groth, D., and Clark, C. 2000. Panicle blight, recent

research points to a bacterial cause. Rice Journal (April 15, 2000):26-28.

La Bonte, D. R., Fajardo, D. S., Cannon, J. M., Clark, C. A., and Wilson, P. W. 2001. National Sweetpotato Collaborators Group Evaluation - LSU AgCenter. Pages 18-20 in; McLaurin, W. J., ed. National Sweetpotato Collaborators Group Progress Report 2000.

La Bonte, D. R., Cannon, J. M., Clark, C. A., Wilson, P. W., and Villordon, A. Q. 2002.

National Sweetpotato Collaborators Group Evaluation - LSU AgCenter. Pages 18-19 in; McLaurin, W. J., ed. National Sweetpotato Collaborators Group Progress Report 2001.

Clark, C. A., Labonte, D. R., Valverde, R. A., Hoy, M. W., Lotrakul, P., Kokkinos, C.,

and McGregor, C. 2003. Technology to improve the quality of sweet potato seed. Louisiana Agriculture 46:29-31.


Clark, C. A., Kokkinos, C. D., Hoy, M. W., and McKoin, L. S. 2005. An update on

sweetpotato virus research. National Sweetpotato Collaborators Group Progress Report 2004, pp. 10-11.

Clark, C.A., Peters, E.A., and Hoy, M.W. 2005. Evaluation of fungicide dips for

post-harvest control of Rhizopus soft rot of sweetpotato, 2004. Fungicide and Nematicide Tests 60:V002.

Miano, D. W., LaBonte, D. R., and Clark, C. A. 2006. Sweetpotato virus disease

research in East Africa. National Sweetpotato Collaborators Group Progress Report 2005, p. 6.

Miano, D. W., LaBonte, D. R., and Clark, C. A. 2006. Virus distribution in field grown

sweetpotato in Africa. National Sweetpotato Collaborators Group Progress Report 2005, p. 6.

Ling, K. S., Clark, C. A., and Kokkinos, C. D. 2006. An update on evaluation of virus

status in the heirloom sweetpotato germplasm materials with real-time PCR technology. National Sweetpotato Collaborators Group Progress Report 2005, p. 6-7.

Kokkinos, C. D., McGregor, C. E., Clark, C. A., and LaBonte, D. R. 2006. Molecular

studies of SPVD. National Sweetpotato Collaborators Group Progress Report 2005, p. 7.

Edmunds, B. A., Clark, C. A., Holmes, G. J., and Gray, E. D. 2007. Survey of

postharvest handling practices on North Carolina and Louisiana sweetpotato packinglines. National Sweetpotato Collaborators Group Progress Report 2006, p. 6.

Villordon, A. Q., Franklin, J. W., Talbot, T. P., McLemore, W., Clark, C., Hoy, M., and

LaBonte, D. 2007. Growing ‘Okinawan’ sweetpotatoes in Louisiana: Preliminary yield trials and initial impressions. National Sweetpotato Collaborators Group Progress Report 2006, p. 6a-6b.

Clark, C. A., Gray, E. D., and Hoy, M. W. 2007. Evaluation of fungicide dips for

post-harvest control of Rhizopus soft rot of sweetpotato, 2006. Plant Disease Management Reports 1:V018.

Edmunds, B. A., Clark, C. A., Holmes, G. J., and Gray, E. D. 2008. Relationships

between preharvest conditions and increased susceptibility of sweetpotatoes to Rhizopus and bacterial soft rots in Louisiana and North Carolina. National Sweetpotato Collaborators Group Progress Report 2007, p. 6.


Ling, K-S., Jackson, D. M., Harrison, H., Pesic-van Esbroeck, Z., Hoy, M., and Clark, C. A. 2008. Efficient regeneration and selection of virus-free sweetpotato plants from Sweet potato leaf curl virus infected materials and their effects on yields in field trials. National Sweetpotato Collaborators Group Progress Report 2007, p. 7.

Villordon, A., Clark, C., Ferrin, D., and LaBonte, D. 2008. Empirical modeling of

sweetpotato yield using heat units and climatic variables: modeling frames and model performance. National Sweetpotato Collaborators Group Progress Report 2007, p. 13.

Ferrin, D. M., Clark, C. A., and Smith, T. P. 2008. Sclerotial blight and circular spot of

sweetpotato Sclerotium rolfsii Sacc. Louisiana Plant Pathology, Disease Identification and Management Series, LSU AgCenter Publ. 3071. 2 pp.

Smith, T. P., Overstreet, C., Clark, C., Ferrin, D., and Burris, E. 2008. Nematode

management in Louisiana sweet potato production. LSU AgCenter Publ. 3075. 4 pp.

Ferrin, D., Smith, T., and Clark, C. 2008. Scurf of sweet potato, Monilochaetes

infuscans, Halsted ex Harter. Louisiana Plant Pathology, Disease Identification and Management Series, LSU AgCenter Publ. 3096. 2 pp.

Smith, T. P., LaBonte, D., Clark, C. A., and Villordon, A. 2009. Happy 60th birthday

Sweet Potato Research Station and Foundation Seed Program, 1949-2009. Louisiana Agriculture 52:8-9.

LaBonte, D., Clark, C., Villordon, A., and Smith T. P. 2009. A really SWEET sweet

potato – that’s Evangeline. Louisiana Agriculture 52:11. Clark, C. A., Smith, T. P., and Ferrin, D. F. 2009. Virus-tested foundation seed works.

Louisiana Agriculture 52:12-13. Clark, C. A., Ferrin, D. M., LaBonte, D., Picha, D. H., Smith, T. P., and Villordon, A.

2009. Managing Rhizopus soft rot on sweetpotatoes. Louisiana Agriculture 52:14-15.

Clark, C. A., Ferrin, D. M., Hoy, M. W., and Smith, T. P. 2010. Evaluation of

fungicides applied at different times for control of sclerotial blight on sweetpotato, 2009. Plant Disease Management Reports 4:V040.

Villordon, A., Solis, J., LaBonte, D., and Clark, C. 2010. The Bayesian choice: towards

a decision-theoretic approach of determining irrigation frequency and amount in sweetpotato production. National Sweetpotato Collaborators Group Progress Report, 2009:12.


Wosula, E., Davis, J. A., and Clark, C. A. 2010. Aphid population dynamics and

potyvirus movement in Louisiana sweetpotato fields. National Sweetpotato Collaborators Group Progress Report, 2009:13.

Villordon, A., and Clark, C. 2010. Some results from simulated flooding studies with in

situ and detached storage roots: methods and potential pitfalls. National Sweetpotato Collaborators Group Progress Report, 2009:15.

Villordon, A., Solis, J., LaBonte, D., Clark, C., and Sheffield, R. 2011. Further

calibration of a Bayesian belief network model representing the relationship between fresh market yield and agroclimatic variables known to influence storage root initiation in ‘Beauregard’ sweetpotato: soil moisture and planting density. National Sweetpotato Collaborators Group Progress Report, 2010:9.

Clark, C., Sweany, R., and Silva, W. da. 2011. Stress effects on sweetpotato storage root

rots, some preliminary observations. National Sweetpotato Collaborators Group Progress Report, 2010:12.

Clark, C. A., Ferrin, D. M., Sweany, R., and Hoy, M. W. 2011. Evaluation of application

timings of Quadris and a biological agent for control of sclerotial blight on sweetpotato, 2010. Plant Dis. Manag. Rep. 5:V078.

Clark, C. A., Sweany, R., and Hoy, M. W. 2011. Evaluation of fungicide dips for post-

harvest control of Rhizopus soft rot of sweetpotato, 2010. Plant Dis. Manag. Rep. 5:V077.

Wang, X., Arancibia, R. A., Main, J. L., Shankle, M. W., and Clark, C. A. 2012.

Changes in phenolic content in sweetpotato subjected to water stress and SPFMV. National Sweetpotato Collaborators Group Progress Report 2011:10.

Villordon, A., Clark, C., LaBonte, D., and Firon, N. 2012. 'Beauregard' and 'Evangeline'

adventitious root developmental response to 1-MCP treatment. National Sweetpotato Collaborators Group Progress Report 2011: 11.

Sweany, R. R., Picha, D. H., and Clark, C. A. 2012. Atmospheric conditions affect the

growth and development of Rhizopus stolonifer and Penicillium. National Sweetpotato Collaborators Group Progress Report 2011:20.

Arancibia, R. A., Clark, C., Grelen, L., Wosula, E., Wang, X., and Main, J. 2012.

Potyvirus incidence in Mississippi sweetpotato fields and effect on storage root initiation. National Sweetpotato Collaborators Group Progress Report 2011:23.

Sweany, R. R., Picha, D. H., and Clark, C. A. 2012. Evaluation of postharvest hot water

treatments and bio-control agents for suppression of Rhizopus soft rot on


sweetpotatoes. National Sweetpotato Collaborators Group Progress Report 2011:24.

Arancibia, R., Clark, C., Stokes, B., Grelen, L., da Silva, W., Baird, R., and Main, J.

2013. Sweetpotato tip and end rot incidence in response to pathogen inoculations and postharvest foliar applications of ethphon. National Sweetpotato Collaborators Group Progress Report 2012:7.

Clark, C., da Silva, W., Arancibia, R., Main, J., Schultheis, J., Pesic van-Esbroeck, Z.,

and Chen, J. 2013. End rots, tip rot, and internal necrosis: investigations into cause and resistance. National Sweetpotato Collaborators Group Progress Report 2012:7-8.

Clark, C. A., da Silva, W., and Villordon, A. 2013. Lenticel proliferation and flooding

associated soft rot in sweetpotato. National Sweetpotato Collaborators Group Progress Report 2012:8-9.

Other Research/Service Accomplishments

Sweetpotato Cultivars - participated on the team that developed and evaluated the following sweetpotato cultivars and breeding lines that have been released by LAES. These all were screened for resistance to multiple diseases including Streptomyces soil rot, Fusarium wilt, internal cork, root-knot nematode, bacterial root and stem rot, Fusarium root rot, and others. The LAES program has been the primary source of resistance to Streptomyces soil rot.

1980 - Travis (L74-62) - grown on limited acreage in LA for several years 1981 - Eureka (L74-131) - grown on limited acreage in CA for several years 1987 - Beauregard (L82-508) - grown on approx. 80% of US acreage 1990-2005,

also grown in Australia and New Zealand. 1992 - Hernandez (L82-66) - grown on approx. 5-10% of US acreage since 1995,

mostly in NC 1994 - L86-33 - used as a source of multiple disease and pest resistance in U.S.

and international breeding programs 1995 - Darby (L87-59) - not grown commercially to any significant extent 2001 - L96-117 - Patent No. US PP 15,038 P2 awarded to LaBonte, D., Wilson,

P., Clark, C., Villordon, A., and Cannon, J. 2002 - Bienville (L94-96) - Patent No. US PP 15,580 P3 awarded to LaBonte, D.,

Wilson, P., Clark, C., Villordon, A., Cannon, J., Story, R., and Hammond, A.

2007 - Evangeline (L99-35) - Patent No. US 2008-0271216-P1 awarded to LaBonte, D., Villordon, A., Clark, C.

2007 - Muraski-29 (L01-29) – Patent PP19955 issued to D. R. LaBonte, A. Q. Villordon, and C. A. Clark


2011 – Bonita (L05-29) – Patent No. US PP22,719P3 issued to D. R. LaBonte, A. Q. Villordon, T. P. Smith, and C. A. Clark.

2012 – Orleans (L05-111) – Patent No. US PP23,761 issued to D. R. LaBonte, A. Q. Villordon, T. Smith, and C. Clark

2012 – 07-146 – Patent No. US PP23,785 P3 issued to D. R. LaBonte, A. Q. Villordon, T. Smith, and C. A. Clark

Foundation Seed Program - based primarily on research results of the team of

researchers in LAES (Plant Pathology & Crop Physiology, Sweet Potato Research Station, Horticulture, and Entomology), the decision was made to convert the Louisiana Sweetpotato Foundation Seed Program at Chase, LA in 1999 to exclusive production of 'virus-tested' seed. We have processed more than 75 different sweetpotato cultivars, breeding lines, and clones through meristem-tip culture and virus indexing and maintain by nodal propagation in tissue culture the resulting 'virus-tested' plantlets of each. Currently, we provide starting material of the primary mericlones of Beauregard and Evangeline to Certis USA for micropropagation. Certis, USA in turn sells micropropagated, virus-tested tissue cultures to the foundation seed programs in Louisiana, Mississippi, and Alabama. We micropropagate all other genotypes grown at Chase, which includes additional mericlones of Beauregard, approximately a half dozen mericlones each of L96-117, Bienville, O'Henry, and Texas Porto Rico, and individual mericlones of about a dozen other genotypes.

curriculum vitae christopher a. clark education · 2019-02-19 · responsibility for teaching...

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