Division of Agriculture and Natural Resources
Division of Agriculture and Natural Resources
Division of Agriculture and Natural Resources
University of California
Division of Agriculture and Natural Resources

Dr. Georgios Vidalakis

Photo of Dr Georgios Vidalakis
Professor & UC Extension Specialist in Plant Pathology - Director, Citrus Clonal Protection Program (CCPP)
Department of Plant Pathology & Microbiology
900 University Avenue
1463 Boyce Hall
Riverside, CA 92521
(951) 827-3763
vidalg@ucr.edu Create VCard

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Biography

Dr. Vidalakis completed his undergraduate studies in 1998 at the Agricultural University of Athens, Greece with concentration in plant protection and environment and specialization in plant virology. He became the director of Citrus Clonal Protection Program (CCPP) in the summer of 2005 a year after earning his Ph.D. from the Department of Plant Pathology at the University of California, Riverside, where he was the recipient of the Special Dean’s Fellowship Award for the duration of his doctoral studies. Funded by the Citrus Research Board, California Citrus Nursery Board, California Department Food and Agriculture, and the United States Department of Agriculture, Dr. Vidalakis has developed a diverse research and extension program that is serving all citrus producing states in the US via the citrus germplasm services of the National Clean Plant Network (NCPN) and the CCPP.

As an Extension Specialist Dr. Vidalakis has been working directly with the citrus industry, growers and nurseries, at a state and national level. His service to the citrus industry include, but is not limited to, the organization of industry supported events (e.g. Meeting the Challenge of the Asian Citrus Psyllid in Nurseries), participation in key industry organizations and committees (e.g. California Citrus Quality Council-Citrus Pest Management Strategic Plan) as well as state and national panels and workgroups (e.g. Recovery Plans for the National Plant Disease Recovery System and National Plant Diagnostic Network STAR-D Board).

As a researcher, Dr. Vidalakis has developed a program focused on the study of graft-transmissible pathogens of citrus with emphasis on viruses, viroids, and bacteria. Mixed viral infection and their effect to biodiagnosis of citrus diseases as well as the biological activity, molecular properties and intrapopulation structure of citrus viroids have been part of his work. He is also focusing on citrus diseases, such as Huanglongbing (HLB), and citrus associated microbes and their potential beneficial impacts on citrus production as well as the optimization of the functions of citrus germplasm programs, which include: diagnostics (bioindexing and laboratory), therapy (shoot tip grafting and thermotherapy), production, and distribution of citrus propagative materials (foundation blocks and variety management).

Dr. Vidalakis is also participating in several national and international programs. He is the Chair of the Citrus Network of the National Clean Plant Network (NCPN) for Specialty Crops and he is a member of the Laboratory Accreditation Board STAR-D of the USDA National Plant Diagnostic Network (NPDN). He is a member of the Viroid Study Group of the International Committee on Taxonomy of Viruses (ICTV) and he serves as the secretary and 2019 Chair-Elect of the International Organization of Citrus Virologists (IOCV).

Education

Ph.D. Plant Pathology-Citrus Virology, University of California, Riverside. 2004
B.S. & M.Sc. Plant Protection & Environment, Agricultural University of Athens, Greece. 1998

Specialty

Graft-transmissible diseases of citrus diagnosis and therapy & Citrus germplasm.

Areas of Expertise (click to see all ANR academics with this expertise)

Bibliography

Peer Reviewed

  • Chambers, G. A.; Donovan, N. J.; Bodaghi, S.; Jelinek, S. M.; Vidalakis, G. (2018). A novel citrus viroid found in Australia, tentatively named citrus viroid VII. Archives of Virology. 163, 215-218. https://doi.org/10.1007/s00705-017-3591-y
  • Pagliaccia, Deborah; Urak, Ryan Z.; Wong, Frank; Douhan, LeAnn I.; Greer, Christopher A.; Vidalakis, Georgios; Douhan, Greg W. (2018). Genetic Structure of the Rice Blast Pathogen (Magnaporthe oryzae) over a Decade in North Central California Rice Fields. Microbial Ecology. 75, 310-317. https://doi.org/10.1007/s00248-017-1029-4
  • Pagliaccia, Deborah; Shi, Jinxia; Pang, Zhiqian; Hawara, Eva; Clark, Kelley; Thapa, Shree P.; De Francesco, Agustina; D. Liu, Jianfeng; Tran, Thien-Toan; Bodaghi, Sohrab; Folimonova, Svetlana Y.; Ancona, Veronica; Mulchandani, Ashok; Coaker, Gitta; Wang, Nian; Vidalakis, Georgios; Ma, Wenbo (2017). A Pathogen Secreted Protein as a Detection Marker for Citrus Huanglongbing. Frontiers in Microbiology. 8:2041, 13. https://www.frontiersin.org/article/10.3389/fmicb.2017.02041
  • Hadidi, A.; Sano, T.; Vidalakis, G. (2017). Economic significance of viroids in fruit trees and grapevine. Viroids and Plant Viral Satellites.A. Hadidi, R. Flores, J. Randles and P. Palukaitis.. 15-25.
  • Osman, Fatima; Dang, Tyler; Bodaghi, Sohrab; Vidalakis, Georgios (2017). One-step multiplex RT-qPCR detects three citrus viroids from different genera in a wide range of hosts. Journal of Virological Methods. 245, 40-52. http://www.sciencedirect.com/science/article/pii/S0166093416305249
  • Lavagi, I.; Matoušek, J.; Vidalakis, G. (2017). Other Cocadviroids. Viroids and Plant Viral Satellites.A. Hadidi, R. Flores, J. Randles and P. Palukaitis.. 275-287.
  • Di Serio, F.; Li, S.; Pallás, V.; Owens, R.; Randles, J.; Sano, T.; Verhoeven, J.; Vidalakis, G.; Flores, R. (2017). Taxonomy of Viroids. Viroids and Plant Viral Satellites.A. Hadidi, R. Flores, J. Randles and P. Palukaitis.. 135-146.
  • Tan, S. H.; Talibov, T. H. O.; Krueger, R. R.; Bodaghi, S.; Dang, T.; Chao, Y. Y.; Greer, G.; Vidalakis, G. (2016). First Report of Citrus Exocortis Viroid and Two Citrus Variants of the Hop Stunt Viroid on Lemon in Azerbaijan. 100, 2341-2341. https://doi.org/10.1094/PDIS-05-16-0761-PDN
  • Stover, E.W.; Kahn, T.; Roose, M.; Siebert, T.; Vidalakis, G.; Krueger, R.R.; Gmitter, F.; Grosser, J.; Co-editors: Gasic, K.; Preece, J.E.; Karp, D. (2016). Register of New Fruit and Nut Cultivars List 48. 51, 620-652. http://hortsci.ashspublications.org/content/51/6/620.short
  • da Graça, J.V.; Douhan, G.; Halbert, S.; Keremane, M.L.; Lee, R.F.; Vidalakis, G.; Zhao, H. (2015). An Overview of a Complex Pathosystem Ravaging the World’s Citrus. Journal of Integrative Plant Biology. 373-387. http://onlinelibrary.wiley.com/doi/10.1111/jipb.12437/abstract;jsessionid=26C5FB06DD605C458EEFD41599A98E8F.f01t02
  • Osman, F.; Hodzic, E.; Kwon, S.; Wang, J.; Vidalakis, G. (2015). "Development and validation of a multiplex reverse transcription quantitative PCR (RT-qPCR) assay for the rapid detection of Citrus tristeza virus, Citrus psorosis virus, and Citrus leaf blotch virus." Journal of Virological Methods 220: 64-75.
  • Pagliaccia, Deborah; Vidalakis, Georgios; Douhan, Greg W.; Lobo, Ramiro; Tanizaki, Gary (2015). "Genetic Characterization of Pitahaya Accessions Based on Amplified Fragment Length Polymorphism Analysis." HortScience 50(3): 332-336.
  • Gergerich, R.C.; Welliver, R.A.; Gettys, S.; Osterbauer, N.K.; Kamenidou, S.; Martin, R.R.; Golino, D.A.; Eastwell, K.; Fuchs, M.; Vidalakis, G.; Tzanetakis, I.E. (2015). Safeguarding Fruit Crops in the Age of Agricultural Globalization. Plant Disease. 99, 176-187. http://dx.doi.org/10.1094/PDIS-07-14-0762-FE
  • Silva, D.; Lovatt, C.; Vidalakis, G.; Roose, M. (2014). Citrus. California Master Gardener Handbook. UC ANR.
  • Kwon, S.; Tan, S.; Vidalakis, G. (2014). "Complete nucleotide sequence and genome organization of an endornavirus from bottle gourd (Lagenaria siceraria) in California, U.S.A." Virus Genes 49: 163-168.
  • Di Serio, F.; Flores, R.; Verhoeven, J. Th. J.; Li, S.-F.; Pallás, V.; Randles, J. W.; Sano, T.; Vidalakis, G.; Owens, R. A. (2014). "Current status of viroid taxonomy." Archives of Virology 159(12): 3467-3478.
  • Bostock, R.; Thomas, C.; Hoenisch, R.; Golino, D.; Vidalakis, G. (2014). "Diagnostics in Plant Health: How Diagnostic Networks and Inter-Agency Partnerships Protect Plant Systems from Pests and Pathogens." California Agriculture
  • Polek, M.; Vidalakis, G. (2014). Invasive Pests: Exotic Plant Pathogens. Citrus Production Manual.L. Ferguson and E. Grafton-Cardwell. UC ANR.: 347-360.
  • Shi, J.; Pagliaccia, D.; Morgan, R.; Qiao, Y.; Vidalakis, G.; Ma, W. (2014). "Novel Diagnosis for Citrus Stubborn Disease by Detection of a Spiroplasma citri-Secreted Protein." Phytopathology 104(2): 188-195.
  • Gasic, Ksenija; Preece, John E.; Gradziel, Thomas; Beckman, Thomas G.; Luby, James J.; Bedford, David S.; Ledbetter, Craig A.; Beckman, Thomas G.; Finn, Chad E.; Clark, John R.; Hummer, Kim E.; Bors, Robert H.; Ehlenfeldt, Mark K.; Stover, Ed W.; Kahn, Tracy; Roose, Mikeal; Siebert, Toni; Vidalakis, Georgios; Krueger, Robert; Gmitter, Fred; Grosser, Jude; Stover, Ed; Kahn, Tracy; Roose, Mikeal; Siebert, Toni; Vidalakis, Georgios; Krueger, Robert; Gmitter, Fred; Grosser, Jude; Vorsa, Nicholi; Hummer, Kim E.; Byers, Patrick L.; Owens, Christopher L.; Ehlenfeldt, Mark K.; Gasic, Ksenija; Gasic, Ksenija; Beckman, Thomas G.; Leslie, Charles A.; Gasic, Ksenija; Burkes, Breanna; Beckman, Thomas G.; Chater, John M.; Moore, Patrick P.; Kempler, Chaim; Lewers, Kim S. (2014). "Register of New Fruit and Nut Cultivars List 47." HortScience 49(4): 396-421.
  • Kahn, T.; Vidalakis, G. (2014). Scion Cultivars. Citrus Production Manual.L. Ferguson and E. Grafton-Cardwell. UC ANR.: 63-94.
  • Vidalakis, G.; Gumpf, D.; Polek, M.; Bash, J. (2014). The California Citrus Clonal Protection Program. Citrus Production Manual.L. Ferguson and E. Grafton-Cardwell. UC ANR.: 117-130.
  • Gumpf, D.; Polek, M.; Vidalakis, G. (2014). Virus and Viroid Diseases. Citrus Production Manual.L. Ferguson and E. Grafton-Cardwell. UC ANR.: 337-346.
  • Wang, J.; Boubourakas, I.; Voloudakis, A.; Agorastou, T.; Magripis, G.; Kyriakopoulou, P.; Vidalakis, G. (2013). "Identification and Characterization of Viroids in the Greek National Citrus Germplasm Collection Reveals Novel Viroid Variants and Threats to the Industry." European Journal of Plant Pathology 137: 17-27.
  • Wang, J.; Bozan, O.; Kwon, S.; Dang, T.; Rucker, T.; Yokomi, R.; Lee, R.; Folimonova, S.; Krueger, R.; Bash, J.; Greer, G.; Diaz, J.; Serna, R.; Vidalakis, G. (2013). "Past and future of a century old Citrus tristeza virus collection: a California citrus germplasm tale." Frontiers in Microbiology 4(366): 1-13.
  • Zhao, H.; Sun, R.; Albrecht, U.; Padmanabhan, C.; Wang, A.; Coffey, M.; Girke, T.; Wang, Z.; Close, T.; Roose, M.; Yokomi, R.; Folimonova, S.; Vidalakis, G.; Rouse, R.; Bowman, K.; Jin, H. (2013). "Small RNA profiling reveals phosphorus deficiency as a contributing factor in symptom expression for citrus Huanglongbing disease." Molecular Plant 6: 301-310.
  • Parrano, L.; Afunian, M.; Pagliaccia, D.; Douhan, G.; Vidalakis, G. (2012). "Characterization of viruses associated with garlic plants propagated from different reproductive tissues from Italy and other geographic regions." Phytopathologia Mediterranea 51(3): 549-565.
  • Vidalakis, G. (2012). Diseases. Integrated Pest Management for Citrus. UC ANR. 3303: 39-84.
  • Vidalakis, G.; Pagliaccia, D.; Bash, J.; Afunian, M.; Semancik, J. (2011). "Effects of Citrus Dwarfing viroid, a transmissible small nuclear RNA on tree size and scion performance specific to poncirus trifoliata rootstock with applications for high density planting." Annals of Applied Biology 158: 204-217.
  • Hajeri, S.; Ramadugu, C.; Manjunath, J.; Ng, J.; Lee, R.; Vidalakis, G. (2011). "In vivo generated Citrus exocortis viroid progeny variants display a range of phenotypes with altered levels of replication, systemic accumulation and pathogenicity." Virology 417(2): 400-409.
  • DiSerio, F.; Randels, J.; Flores, R.; Owens, R.; Sano, T.; Li, S.; Vidalakis, G.; Pallas, V. (2011). Viroids. Virus Taxonomy.A. King, M. Adams, E. Carstens and E. Lefkowitz. Oxford, Elsevier.: 1221-1234.
  • Vidalakis, G.; Pagliaccia, D.; Bash, J.; Semancik, J. (2010). "Effects of mixtures of citrus viroids as transmissible small nuclear RNA (TsnRNA) on tree dwarfing andd commercial scion performance on carrizo citrange rootstock." Annals of Applied Biology 157: 415-423.
  • Hajeri, S.; Ramadugu, C.; Keremane, M.; Vidalakis, G.; Lee, R. (2010). "Nucleotide Sequence and Genome Organization of Dweet mottle virus and Its Relationship to Members of the Family Betaflexiviridae." Archives of Virology 155: 1523-1527.
  • Polek, M.; Vidalakis, G.; Godfrey, K. (2007). Citrus Bacterial Canker Disease and Huanglongbing (Citrus Greening). UC ANR. 8218, 12. http://anrcatalog.ucdavis.edu/pdf/8218.pdf
  • Szychowski, J.; Vidalakis, G.; Semancik, J. (2005). "Host directed processing of Citrus exocortis viroid." Journal of General Virology 86: 473-477.
  • Semancik, J.; Vidalakis, G.; Szychowski, J.; Pond, E.; Menge, J. (2005). Interactions among Citrus Viroids and Phytophthora citrophthora. 16th Conference of the International Organization of Citrus Virologists, Riverside, CA.
  • Vidalakis, G.; Davis, J.; Semancik, J. (2005). "Intra-population diversity between citrus viroid II variants described as agents of cachexia disease." Annals of Applied Biology 146: 449-458.
  • Semancik, J.; Vidalakis, G. (2005). "The question of Citrus viroid IV as a Cocadviroid." Archives of Virology 150: 1059-1067.
  • Vidalakis, G.; Gumpf, D.; Bash, J.; Semancik, J. (2004). ""Finger Imprint" of Poncirus trifoliata: A Specific Interaction of a Viroid, a Host, and Irrigation." Plant Disease 88: 709-713.
  • Onelge, N.; Cinar, A.; Szychowski, J.; Vidalakis, G.; Semancik, J. (2004). "Citrus Viroid II Variants Associated with "Gummy Bark" Disease." European Journal of Plant Pathology 110: 1047-1052.
  • Vidalakis, G.; Garnsey, S.; Bash, J.; Greer, G.; Gumpf, D. (2004). "Efficacy of Bioindexing for Graft-Transmissible Citrus Pathogens in Mixed Infections." Plant Disease 88: 1328-1334.

Non-Peer Reviewed

  • Godfrey, K.; Araujo, K.; Vidalakis, G.; Slupsky, C.; Davis, C.; Leveau, J.; Hajeri, S.; Jin, H.; Keremane, M.L. (2017). Are Early Huanglongbing Detection Methods Impacted by Citrus Stubborn and Citrus Tristeza Diseases in California? Citrograph. 8:2, 48-50.
  • Kahn, T.; Siebert Wooldridge, T.; Krueger, R.R.; Greer, G.D.; Polek, M.; Vidalakis, G. (2017). Looking for Something New? Check Out Background, Results of Potential New Cultivars for California. Citrograph. 8:2, 72-89.
  • Lavagi, I.; Christiano, R.; Greer, G.D.; Grosser, J.; Gmitter, F.; Bowman, K.D.; Stover, E.W.; McCollum, G.; Rosson, B.; Sieburth, P.J.; Polek, M.; Krueger, R.R.; Vidalakis, G. (2017). Protocol for introducing new and licensed citrus varieties into California. A Florida case study. Citrograph. 1, 8.
  • Osman, F.; Pagliaccia, D.; Vidalakis, G. (2017). Real-time PCR Co-detection of ‘Candidatus Liberibacter’ Species and Spiroplasma citri. Citrograph. 8:4, 64-68.
  • Vidalakis, G. (2017). Safeguarding citrus stock. Citrus Industry. 98:1, 29-31.
  • Vidalakis, G. (2016). Avocado Sunblotch Viroid testing by RT-qPCR Grove Sampling Project. UC ANR Blogs. Topics in Subtropics. http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=21554
  • Vidalakis, G. (2016). Citrus Clonal Protection Program (CCPP) and National Clean Plant Network (NCPN): A Model System for Management of Citrus Diseases. Topics in Subtropics. UC ANR Newsletter. 14:2, 5-6.
  • Dang, T.; Vidalakis, G. (2016). High throughput method detects multiple citrus pathogens in a single reaction. Citrograph. 7:4, 46-49.
  • Vidalakis, G.; Douhan, G. (2016). Protecting California Citrus. UC ANR Blogs. Topics in Subtropics. http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=21431
  • Vidalakis, G. (2015). California’s Citrus Clonal Protection Program (CCPP) and the Citrus Nursery Stock Pest Cleanliness Program. International Organization of Citrus Virologists (IOCV). Newsletter. July 2014/July 2015, 10-12.
  • Kallsen, C.; O'Connell, N.; Vidalakis, G. (2015). Did a Newly Introduced Fukumoto Navel Budline from Spain Perform Better than the California Budline in the San Joaquin Valley? Topics in Subtropics. UC ANR Newsletter. 13:2, 2-9.
  • Pagliaccia, D.; Shi, J.; Osman, F.; Vidalakis, G.; Ma, W. (2014). Advancing the understanding and diagnosis of citrus stubborn disease. 16th International Congress on Molecular Plant-Microbe Interactions (MPMI), Rhodes, Greece.
  • Vidalakis, G.; Dang, T.; Jin, H.; Ma, W.; Osman, F.; Pagliaccia, D.; Rucker, T.; Wang, A. (2014). High throughput, universal, multiplex, indirect, and non-pcr based diagnostic protocols for citrus pathogens. 16th International Congress on Molecular Plant-Microbe Interactions (MPMI), Rhodes, Greece.
  • Vidalakis, G.; Greer, G.; Christiano, R. (2014). Meet the Citrus Clonal Protection Program: Generation Four. Citrograph. 5:3, 30-39.
  • Grafton-Cardwell, E.E.; Morse, J.; Civerolo, E.; Gottwald, T.; Hoddle, M.; Setamou, M.; Vidalakis, G. (2014). Science advisory panel meets to discuss Huanglongbing/Asian Citrus Psyllid (HLB/ACP). Citrograph. 5:3, 42-48.
  • Vidalakis, G. (2014). Update on the Citrus Clonal Protection Program. Citrograph. 5, 44-51. Winter. http://www.citrusresearch.org/wp-content/uploads/Citrograph-Winter-2014-C-Web.pdf
  • Wang, J.; Vidalakis, G. (2013). A Molecular Non-PCR Based High Throughput Multiplex Detection Method for Citrus Pathogens. 32nd Annual American Society for Virology, Pennsylvania.
  • Rucker, T.; Dang, T.; Tan, S.; Wang, J.; Vidalakis, G. (2013). A Semi-Automated Nucleic Acid Extraction and Purification Protocol for Citrus Tissue. 19th Conference of the International Organization of Citrus Virologists, Mpumalanga, South Africa.
  • Vidalakis, G.; Krueger, R. (2013). California ACP & HLB Quick Update. Newsletter.G. Vidalakis. Riverside, CA, International Organization of Citrus Virologists (IOCV). 25-26. December. http://iocv.org/docs/IOCV-NewsLetter-December%202013.pdf
  • Duran-Vila, N.; Vidalakis, G. (2013). Citrus Viroids: An 80 Years Journey 1934-2013. 19th Conference of the International Organization of Citrus Virologists, Mpumalanga, South Africa.
  • Pagliaccia, D.; Wang, J.; Bozan, O.; Shi, J.; Ma, W.; Vidalakis, G. (2013). Mechanical Inoculation of Citrus and Periwinkle with Spiroplasma Citri. 19th Conference of the International Organization of Citrus Virologists, Mpumalanga, South Africa.
  • Herradura, L.; Wang, J.; Dang, T.; Rucker, T.; Vidalakis, G. (2013). Molecular Characterization of Citrus tristeza virus Isolates from Philippines. 19th Conference of the International Organization of Citrus Virologists, Mpumalanga, South Africa.
  • Wang, J.; Yokomi, R.; Lee, R.; Folimonova, S.; Vidalakis, G. (2013). Molecular diversity of Citrus tristeza virus in California. 2013 APS-MSA Joint Meeting, Austin, Texas.
  • Wang, J.; Bozan, O.; Kwon, S.; Rucker, T.; Yokomi, R.; Lee, R.; Folimonova, S.; Greer, G.; Krueger, R.; Bash, J.; Vidalakis, G. (2013). Past and Future of a Century Old Citrus Tristeza Virus Collection-A California Citrus Germplasm Tale. Frontiers in Virology “Closteroviridae”.R. Flores, P. Moreno, B. Falk and P. Martelli. http://www.frontiersin.org/Journal/10.3389/fmicb.2013.00366/abstract
  • Wang, J.; Roose, M.; Ramadugu, C.; Lee, R.; Keremane, M.; Lin, H.; Chen, J.; Shatters, R.; Polek, M.; LeVesque, C.; Vidalakis, G. (2013). Preliminary Evaluation of the Single-Tree, Huanglongbing Find in California. International Research Conference on Huanglongbing-IRCHLB III, Orlando, Florida.
  • Karp, D.; Kahn, T.; Siebert, T.; Krueger, R.; Lee, R.; Vidalakis, G. (2013). Unforbidden Fruits: Preventing Citrus Smuggling by Introducing Varieties Culturally Significant to Ethnic Communities. Newsletter.G. Vidalakis. Riverside, CA, International Organization of Citrus Virologists (IOCV). 26-30. December. http://iocv.org/docs/IOCV-NewsLetter-December%202013.pdf
  • Vidalakis, G.; Wang, J. (2013). Universal Detection of Citrus Viroids. 19th Conference of the International Organization of Citrus Virologists, Mpumalanga, South Africa.
  • Siebert, T.; Bier, O.; Karp, D.; Vidalakis, G.; Kahn, T. (2013). 'Valentine' - a new pummelo hybrid. UC ANR Blogs. Topics in Subtropics. http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=10367
  • Vidalakis, G. (2012). 2011-12-Citrus Clonal Protection Program (CCPP). Citrus Clonal Protection Program. Citrus Research Board. 3. http://ccpp.ucr.edu/annual%20reports/2011-2012-CCPP%20Annual%20Report.pdf
  • Wang, J.; Vidalakis, G.; Lee, R.; Yokomi, R. (2012). Development of High Throughput Assays for Rapid and Accurate 10-Plex Detection of Citrus Pathogens. American Phytopathological Society, Providence, Rhode Island.
  • Wang, J.; Bozan, O.; Kwon, S.; Rucker, T.; Thomas, C.; Yokomi, R.; Lee, R.; Folimonova, S.; Vidalakis, G. (2012). Molecular diversity of Citrus tristeza virus strains collected over the past 50 years and maintained in planta collections in California. International Citrus Congress, Valencia, Spain.
  • Shi, J.; Pagliaccia, D.; Morgan, R.; Ma, W.; Vidalakis, G. (2012). Serological detection of Spiroplasma citri using a bacterial secreted protein as the detection marker. International Citrus Congress, Valencia, Spain.
  • Karp, D.; Siebert, T.; Vidalakis, G.; Krueger, R.; Lee, R.; Kahn, T. (2012). Unforbidden fruits: Preventing citrus smuggling by introducing varieties culturally significant to ethnic communities. International Citrus Congress, Valencia, Spain.
  • Karp, D.; Kahn, T.; Siebert, T.; Krueger, R.; Lee, R.; Vidalakis, G. (2012). Unforbidden Fruits: Preventing Citrus Smuggling by Introducing Varieties Culturally Significant to Ethnic Communities. Citrograph. 3:5, 40-48. September/October. http://www.citrusresearch.org/current-citrograph
  • Siebert, T.; Vidalakis, G.; Krueger, R.; Bash, J.; Kahn, T. (2011). Background and initial evaluations of recently introduced cultivars distributed by the Citrus Clonal Protection Program. Citrograph. 2:4, 28-35. July/August. http://www.citrusresearch.org/citrograph-august-2011
  • Vidalakis, G. (2011). Citrus viral and prokaryotic pathogens, new discoveries and development of novel detection methods relevant to citrus germplasm quarantine and registration programs. 9th International Congress of Citrus Nurserymen, Tucuman, Argentina.
  • Manjunath, J.; Irey, M.; Ramadugu, C.; Lee, R.; LeVesque, C.; Brady, B.; Polek, M.; Lin, E.; Civerolo, E.; Afunian, M.; Vidalakis, G. (2011). Comparison of different extraction and assay protocols in different laboratories to develop a standardized assay for detection of huanglongbing-associated bacteria from psyllids. 2nd International Research Conference on Huanglongbing, Orlando, Florida.
  • Vidalakis, G. (2011). Dwarfing of citrus on Poncirus trifoliata and P. trifoliate hybrid rootstocks using Transmissible small nuclear ribonucleic acids (TsnRNAs). 9th International Congress of Citrus Nurserymen, Tucuman, Argentina.
  • Adesemoye, A.; Eskalen, A.; O'Connell, N.; Vidalakis, G.; Wang, P.; Roper, C. (2011). Foamy bark rot of Fukumoto navel: A condition with etiology not yet understood. APS/IAPPS Joint meeting, Honolulu, Hawaii.
  • Yokomi, R.; Saponari, M.; Metheney, P.; Vidalakis, G. (2011). Genetic differentiation and biology of Citrus tristeza virus populations spreading in California. 18th Conference of the International Organization of Citrus Virologists, Riverside, CA.
  • Lee, R.; Keremane, M.; Ramadugu, C.; Vidalakis, G.; Roose, M.; Halbert, S.; Rodrigues, J.; Lopes, S. (2011). Huanglongbing: Development of information needed for avoidance/management. Citrograph. 2:7, 34-40. November/December. http://www.citrusresearch.org/nov-dec_citrograph
  • Yokomi, R.; Vidalakis, G.; Saponari, M. (2011). Molecular analysis among MCA13-reactive isolates reveals a rapid strategy for assessment of Citrus tristeza virus severity. 2nd International Symposium on Citrus Biotechnology, Catania, Italy, International Society for Horticultural Science- Acta Horticulturae.
  • Eskalen, A.; Vidalakis, G.; O'Connell, N. (2011). Occurrence of citrus quick decline in California. APS/IAPPS Joint meeting, Honolulu, Hawaii.
  • Hajeri, S.; Ng, J.; Ramadugu, C.; Keremane, M.; Lee, R.; Vidalakis, G. (2011). Study of Citrus exocortis viroid replication in citrus protoplasts. APS/IAPPS Joint meeting, Honolulu, Hawaii.
  • Adesemoye, A.; Eskalen, A.; Mayorquin, J.; Roper, C.; Wang, A.; Vidalakis, G.; Kallsen, C.; O'Connell, N. (2011). Understanding ‘foamy bark rot’ of Fukumoto navel. Citrograph. 2:7, 26-28. November/December. http://www.citrusresearch.org/nov-dec_citrograph
  • Kanrar, S.; Afunian, M.; Greer, G.; Tzanetakis, I.; Vidalakis, G. (2011). Viruses associated with yellow vein and vein enation disease of citrus. APS/IAPPS Joint meeting, Honolulu, Hawaii.
  • Vidalakis, G. (2010). 2009-10-Citrus Clonal Protection Program (CCPP). Citrus Clonal Protection Program. Citrus Research Board. 4. http://ccpp.ucr.edu/annual%20reports/2009-2010-CCPP%20Annual%20Report.pdf
  • Yokomi, R.; Polek, M.; Grafton-Cardwell, E.; Vidalakis, G.; O'Connell, N.; Saponari, M. (2010). Assessment of the Citrus tristeza virus Isolates Detected in Spring 2007 at the Lindcove Research and Extension Center, Exeter, California. 17th Conference of the International Organization of Citrus Virologists, Riverside, CA.
  • Krueger, R.; Lee, R.; Bash, J.; Vidalakis, G. (2010). Citrus Quarantine, Certification, and Registration Programs in the USA. 18th Conference of the International Organization of Citrus Virologists, Sao Paulo, Brazil.
  • Vidalakis, G.; da Graca, J.; Dixon, W.; Ferrin, D.; Kesinger, M.; Krueger, R.; Lee, R.; Melzer, M.; Olive, J.; Polek, M.; Sieburth, P.; Williams, L.; Wright, G. (2010). Citrus quarantine, sanitary and certification programs in the USA. Prevention of introduction and distribution of citrus pests. Part 1-Quarantine and introduction programs. Citrograph. 1:3, 26-35. May/June. http://www.citrusresearch.org/citrograph-may-june-2010-2
  • Vidalakis, G.; da Graca, J.; Dixon, W.; Ferrin, D.; Kesinger, M.; Krueger, R.; Lee, R.; Melzer, M.; Olive, J.; Polek, M.; Sieburth, P.; Williams, L.; Wright, G. (2010). Citrus quarantine, sanitary and certification programs in the USA. Prevention of introduction and distribution of citrus pests. Part 2 – Certification schemes and national programs. Highlights of new California citrus nursery regulations. Citrograph. 1:4, 27-39. July/August. http://www.citrusresearch.org/citrograph-july-august-2010
  • Eskalen, A.; Vidalakis, G.; O'Connell, N. (2010). Citrus quick decline: a disease complex. Citrograph. 1:1, 22-23. January/February. http://www.citrusresearch.org/citrograph-jan-feb-2010
  • Eskalen, A.; Vidalakis, G.; O'Connell, N. (2010). Citrus Quick Decline: A Disease Complex. 18th Conference of the International Organization of Citrus Virologists, Sao Paulo, Brazil.
  • Siebert, T.; Krueger, R.; Kahn, T.; Bash, J.; Vidalakis, G. (2010). Description of new varieties recently distributed from the Citrus Clonal Protection Program. Citrograph. 1:2, 20-26. March/April. http://www.citrusresearch.org/citrograph-mar-apr-2010
  • Vidalakis, G.; Bash, J.; Semancik, J. (2010). Dwarfing of Clementine Mandarin on Carrizo Citrange Rootstock Associated with Mixtures of Citrus Viroids Performing as Transmissible small nuclear RNAs (TsnRNAs). 17th Conference of the International Organization of Citrus Virologists, Riverside, CA.
  • Yokomi, R.; Saponari, M.; Metheney, P.; Grafton-Cardwell, E.; Vidalakis, G. (2010). Genetic differentiation and biology of Citrus tristeza virus populations spreading in eradicative and non-eradicative areas of California. 18th Conference of the International Organization of Citrus Virologists, Sao Paulo, Brazil.
  • Kanrar, S.; Afunian, M.; Greer, G.; Tzanetakis, I.; Vidalakis, G. (2010). Molecular characterization of viruses associated with yellow vein and vein enation disease of citrus. 18th Conference of the International Organization of Citrus Virologists, Sao Paulo, Brazil.
  • Krueger, R.; Vidalakis, G. (2010). National Clean Plant Network (NCPN) Citrus Clean Plant Network Formed. Newsletter.G. Vidalakis. Riverside, CA, International Organization of Citrus Virologists (IOCV). 16-18. May. http://iocv.org/docs/04.2010-05-20-IOCV-NewsLetter.pdf
  • Boubourakas, I.; Vidalakis, G.; Voloudakis, A.; Agorastou, T.; Magripis, G.; Kyriakopoulou, P. (2010). Pilot Survey of citrus mother trees in Greece for the presence of viruses and viroids. 17th Conference of the International Organization of Citrus Virologists, Riverside, CA.
  • Grafton-Cardwell, E.; Vidalakis, G.; Copeland, R. (2010). University of California Lindcove Research and Extension Center celebrtes its 50th Anniversary. Citrograph. 1:2, 8-11. March/April. http://www.citrusresearch.org/citrograph-mar-apr-2010
  • Vidalakis, G.; Krueger, R.; Lee, R. (2010). USA Citrus Clean Plant Network. 18th Conference of the International Organization of Citrus Virologists, Sao Paulo, Brazil.
  • Siebert, T.; Bier, O.; Karp, D.; Vidalakis, G.; Kahn, T. (2009). "Valentine" A recently released anthocyanin-pigmented Pummelo Hybrid Developed at the Univeristy of California, Riverside. Topics in Subtropics Newsletter.C. Kallsen. UCCE. 7:3, 2-5. July-September. http://ceventura.ucdavis.edu/newsletters/Volume_7,No3--July-September_200929894.pdf
  • Vidalakis, G. (2009). 2008-09-Citrus Clonal Protection Program (CCPP). Citrus Clonal Protection Program. Citrus Research Board. 3. http://ccpp.ucr.edu/annual%20reports/2008-2009-CCPP%20Annual%20Report.pdf
  • Vidalakis, G. (2009). Asian Citrus psyllid and Huanglongbing - A snapshot of the current status in California and USA. Newsletter.G. Vidalakis. Riverside, CA, International Organization of Citrus Virologists (IOCV). 7-8. April. http://iocv.org/docs/IOCV-NewsLetter-April-09-GV-final1.pdf
  • Vidalakis, G. (2009). Asian Citrus Psyllid Workshop, Riverside California. Newsletter.G. Vidalakis. Riverside, CA, International Organization of Citrus Virologists (IOCV). 21. October. http://iocv.org/docs/IOCV-NewsLetter-October-2009.pdf
  • Hajeri, S.; Vidalakis, G. (2009). Biological properties of in planta generated Citrus excortis viroid mutants. American Society of Virology, Vancouver, Canada.
  • Vidalakis, G. (2009). California Asian Citrus Psyllid Findings. Newsletter.G. Vidalakis. Riverside, CA, International Organization of Citrus Virologists (IOCV). 16. October. http://iocv.org/docs/IOCV-NewsLetter-October-2009.pdf
  • Vidalakis, G. (2009). CCPP, Preparations to face the ACP/HLB challenge. Newsletter.G. Vidalakis. Riverside, CA, International Organization of Citrus Virologists (IOCV). 17-19. October. http://iocv.org/docs/IOCV-NewsLetter-October-2009.pdf
  • Yokomi, R.; Saponari, M.; Metheney, P.; Polek, M.; Vidalakis, G. (2009). Genetic Diverstiy of Citrus Tristeza virus isolates collected recently in California. American Phytopathological Society, Portland, Oregon.
  • Yokomi, R.; Vidalakis, G.; Saponari, M. (2009). Molecular analysis among MCA13- reactive isolates reveals a rapid strategy for assessment of Citrus tristeza virus severity. 2nd International Citrus Biotechnology Symposium, Catania, Italy.
  • Zhou, C.; Vidalakis, G. (2009). News from CRI, CAAS on the 11th International Citrus Congress Held in Wuhan P.R. China. Newsletter.G. Vidalakis. Riverside, CA, International Organization of Citrus Virologists (IOCV). 2-4. April. http://iocv.org/docs/IOCV-NewsLetter-April-09-GV-final1.pdf
  • Vidalakis, G.; da Graca, J.; Dixon, W.; Kesinger, M.; Krueger, R.; Lee, R.; Polek, M.; Sieburth, P.; Williams, L.; Wright, G. (2009). Quarantine, sanitary, and certification programs to prevent citrus quarantine pests in the USA. International workshop on citrus quarantine pests, Villahermosa, Tabasco, México, North American Plant Protection Organization (NAPPO).
  • Kahn, T.; Vidalakis, G. (2009). The University of California-Riverside Citrus Variety Collection and Citrus Clonal Protection Program Website Provide Information, Photographs, Fruit Quality data and more. Topics in Subtropics Newsletter.C. Kallsen. UCCE. 7:3, 6. July-September. http://ceventura.ucdavis.edu/newsletters/Volume_7,No3--July-September_200929894.pdf
  • Vidalakis, G. (2008). 2007-08-Citrus Clonal Protection Program (CCPP). Citrus Clonal Protection Program. Citrus Research Board. 4. http://www.citrusresearch.org/2008-ccpp-georgios-vidalakis
  • Lee, R.; Yokomi, R.; Vidalakis, G. (2008). First report of citrus measles in California. 11th International Citrus Congress, Wuhan, China.
  • Vidalakis, G. (2008). From the Past and Present Secretaries. Newsletter.G. Vidalakis. Riverside, CA, International Organization of Citrus Virologists (IOCV). 2. June. http://iocv.org/docs/2008-06-IOCV-Newsletter.pdf
  • Afunian, M.; Jin, H.; Ma, W.; Vidalakis, G. (2008). Mechanical inoculation of citrus with culture of Spiroplasma citri, the casual agent of stubborn disease. 11th International Citrus Congress, Wuhan, China.
  • Vidalakis, G.; Bash, J.; Semancik, J. (2008). Observations on Field Performance of Tsn-RNA Dwarfed Poncirus trifoliata Hybrids. 11th International Citrus Congress, Wuhan, China.
  • Vidalakis, G.; Bash, J.; Semancik, J. (2008). Observations on Field Performance of Tsn-RNA Dwarfed Poncirus trifoliata Hybrids. 11th International Citrus Congress, China, China Agricultural Press.
  • Vidalakis, G.; Bash, J.; Semancik, J. (2008). Tsn-RNA Dwarfing and High Density Planting of Citrus on Poncirus trifoliata rootstock. 11th International Citrus Congress, China, China Agricultural Press.
  • Vidalakis, G.; Bash, J.; Semancik, J. (2008). Tsn-RNA Dwarfing and High Density Planting of Citrus on Poncirus trifoliata rootstock. 11th International Citrus Congress, Wuhan, China.
  • Vidalakis, G. (2007). 2006-07-Citrus Clonal Protection Program (CCPP). Citrus Clonal Protection Program. Citrus Research Board. 60-61. http://www.citrusresearch.org/2007-georgios-vidalakis-ccpp
  • Vidalakis, G.; Bash, J.; Diaz, J.; Greer, G.; Serna, R. (2007). Citrus Clonal Protection Program - CCPP. Serving California Citrus Industry over 50 Years. Centennial Symposium, Citrus Research Center - Agricultural Experiment Station, UC Riverside, CA.
  • Boubourakas, I.; Vidalakis, G.; Voloudakis, A.; Agorastou, T.; Magripis, G.; Kyriakopoulou, P. (2007). Pilot survey of citrus mother trees in Greece for the presence of viruses and viroids. 17th Conference of the International Organization of Citrus Virologists, Adana, Turkey.
  • Hajeri, S.; Ng, J.; Vidalakis, G. (2007). Study of the intra-population profile of Citrus Exocortis Viroid in protoplasts of suspension-cultured tobacco and citrus cells. American Phytopathological Society/Society of Nematologists Joint Meeting, San Diego, CA.
  • Keremane, M.; Ramadugu, C.; Williams, M.; Vidalakis, G.; Lee, R. (2007). The threat of Huanglongbing (Citrus Greening Disease) for California. Centennial Symposium, Citrus Research Center - Agricultural Experiment Station, UC Riverside, CA.
  • Vidalakis, G.; Bash, J.; Semancik, J. (2007). Transmissible Small Nuclear RNA Dwarfing of Commercial Citrus on Carrizo Citrange Rootstock. 17th Conference of the International Organization of Citrus Virologists, Adana, Turkey.
  • Vidalakis, G. (2006). Director Citrus Clonal Protection Program (CCPP). Newsletter.C. Roistacher. Riverside, CA, International Organization of Citrus Virologists (IOCV). 1. April. http://iocv.org/docs/2006%20Newsltr%20April%202006%20addendum.pdf
  • Lee, R.; Keremane, M.; Williams, M.; Vidalakis, G. (2006). Huanglongbing, Citrus Greening: Preparing For The Future. Topics in Subtropics Newsletter.M. Freeman. UCCE. 4:1, 4-6. January-March. http://ceventura.ucdavis.edu/newsletters/Volume_4,_No_1_-_January-March_200629909.pdf
  • Vidalakis, G.; Semancik, J. (2006). Population structures of the RNA molecules for citrus exocortis and cachexia disease viroids. APS/CPS/MSA Joint Meeting, Québec City, Québec, Canada.

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