Plant C

CURRICULUM VITAE

Christopher A. Clark

Department of Plant Pathology &

Crop Physiology

Louisiana State University

Baton Rouge, LA 70803-1720

Phone: 225-***-****, FAX: 225-***-****

E-mail: abpp0z@r.postjobfree.com

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 and responsibility in the

area of 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 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. I taught one lab on bacterial plant diseases annually

from 1989 to 1999. Taught the undergraduate level course in general plant pathology at

LSU during the Fall semester, 1979 in place of M. C. Rush who was on sabbatic leave.

Enrollment was 25 students.

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

sweet potatoes.

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

bacterial disease diagnosis.

Plant Pathology 7052 - Seminar. Coordinated the departmental seminar, Spring 1980 and

1981, Fall 1998, and Spring 2003.

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.

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

Christopher A. Clark, Page 2

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. 12-14-700*-****, "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 sweet

potato 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).

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

Christopher A. Clark, Page 3

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. 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 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. 370******-***** 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 totalling

$394,575, with A. Hammond and R. Story as co-PIs.

Royalties received for virus-tested sweetpotatoes from Kleentek/Thermo Trilogy (now Certis,

USA): 2001 = $4,000; 2002 = $5,080, 2003 = $4,000, 2004 = $1,925.

Chemical company grants for the period 1979 to 1999 totaled $25,400.

Honorary Society Memberships :

Member - Phi Kappa Phi, Gamma Sigma Delta

Christopher A. Clark, Page 4

Associate member - Sigma Xi

Professional Affiliations :

The American Phytopathological Society

International Society for Horticultural Science

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

Tiptin Team Research Award to the Sweetpotato Team by the LSU AgCenter, 2002

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

Christopher A. Clark, Page 5

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

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, 2006

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-)

Christopher A. Clark, Page 6

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)

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

Chairman, Department committee on space reallocation (1988,1989)

Member, seminar committee, 1993-94, 1998-99.

Department Strategic Planning Committee, Chairman 2001-2002

Courses and Curriculum Committee member (2004-2006)

Graduate Students :

Christopher A. Clark, Page 7

Major advisor for 7 PhD recipients and 5 Masters recipients.

Committee member for 24 PhD and 19 Masters recipients.

Seminars and 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

Christopher A. Clark, Page 8

PUBLICATIONS

I. Books

Clark, C. A., and Moyer, J. W. 1988. Compendium of Sweet Potato Diseases. APS

Press, St. Paul, MN. 74 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.

Christopher A. Clark, Page 9

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 xx-xx in; Molecular Diagnosis of Plant

Viruses, Govin P. Rao, editor, Studium Press,LLC, Houston, TX. In press.

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

Christopher A. Clark, Page 10

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

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

Christopher A. Clark, Page 11

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.

Christopher A. Clark, Page 12

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 F usarium

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

Christopher A. Clark, Page 13

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.

Christopher A. Clark, Page 14

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).

. 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.

Christopher A. Clark, Page 15

D. W.,

Miano, 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.

IV. 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,

Christopher A. Clark, Page 16

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.

Christopher A. Clark, Page 17

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 6t h 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

Christopher A. Clark, Page 18

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

Christopher A. Clark, Page 19

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.

V. 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.

VI. 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.

Christopher A. Clark, Page 20

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.

Christopher A. Clark, Page 21

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

Christopher A. Clark, Page 22

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.)

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

Christopher A. Clark, Page 23

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 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

Christopher A. Clark, Page 24

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

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