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                    U.S. DEPARTMENT OF AGRICULTURE
 Molecular Plant Pathology Laboratory: Beltsville, MD
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ARS Home Northeast Area Beltsville, Maryland (BARC) Beltsville Agricultural Research Center Molecular Plant Pathology Laboratory People





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- Con Baker
- Wei Wei
- Rosemarie Hammond
- Robert Davis
- John Hartung
- Ing Ming Lee
- Lev Nemchinov
- Anna Smigocki
- Yan Zhao

John Stephen Hartung    Research Plant Pathologist Publications  Phone: 301-504-6374Dr. John Hartung   Research Interests: Exotic diseases of citrus, defined as diseases that affect citrus production both in the United states and other citrus growing regions of the world
Establishment and maintenance of theExotic Pathogens of Citrus Collection
A quarantine greenhouse containing citrus pathogens from world-wide locations that are studied and analyzed by cooperators from the USA and many world-wide citrus growing countries.
Development of rapid and sensitive DNA and RNA -based diagnostic methods to assist in plant quarantine and phytosanitary applications, specifically:
Citrus Tristeza Virus
Citrus Variegated Chlorosis
Citrus Canker
Huanglongbing (citrus greening)
Citrus Yellow Mosaic Virus
Citrus Chlorotic Dwarf virus
Citrus LeprosisCurrent Research:
Genetic comparison of Citrus Greening
Parasitic Dodder and Spread of Greening
Analysis of Seed from Greening Affected Fruit
Greening pathogen Location within Citrus TreesSupport Staff:
Julia Cabrera-WoscekLab Technician
Cristina Gouin-PaulHorticulturistCooperation :
Cooperating Institutions (USA):
University of Florida: Ronald H. Brlansky, Fred G. Gmitter
University of California, Davis: Cristina Davis and William Cheung
USDA ARS Ft Detrick, MD: William Schneider, Avijit Roy
USDA ARS Ft. Pierce, FL: Robert Shatters, Dongping Yuan, Mark Hilf
USDA ARS Kearneysville, WV: Zhongrang Liu
USDA ARS, Riverside, CA: Richard Lee, Fatima Osman
USDA APHIS CPHST: Beltsville, MDCooperating Institutions (Foreign):
Southwest China University, Chongqing, China
Huazhong Agricultural University, Wuhan, Hubei, China
CIRAD, FLHOR, Reunion, France
Fundecitrus, Araraquara, Sao Paulo, BrazilCurrent Grants and Outside Funding
Citrus Research and Development Foundation, Lake Alfred, Florida
Visualization and detection of proteins produced by 'Ca. Liberibacter asiaticus' in infected sweet orange plants and vector psyllids
HLB resistance through transgenic expression of short chain fragment variable antibodies against key Liberibacter epitopes
USDA NIFA SCRI
Rear and Release of Psyllids as Biological Control Agents: A Mid-term Solution for Huanglongbing (HLB) Disease of Citrus
Citrus Research Board, Visalia, CA
Development of cryotherapy as an approved method of eliminating graft transmissible pathogens in citrus biological indexing MPPL Home Page  ****


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