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ARS Home Northeast Area Beltsville, Maryland (BARC) Beltsville Agricultural Research Center Molecular Plant Pathology Laboratory People Robert Davis





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Robert E. Davis--Selected Publicationsheadline bar (full list of publications  here) **2013:**
 Davis, R.E., Zhao, Y., Dally, E.L., Lee, I.-M., Jomantiene, R., and Douglas, S. 2013.'Candidatus Phytoplasma pruni', a novel taxon associated with X-disease of stone fruits, Prunus spp.: multilocus characterization based on 16S rRNA, secY, and ribosomal protein genes. **Int J Syst Evol Microbiol******ijs.0.041202-0; published ahead of print July 13, 2012 abstract  Quaglino, F., Zhao, Y., Casati, P., Bulgari, D., Bianco, P.A., Wei W., and Davis, R.E. 2013.'Candidatus Phytoplasma solani', a novel taxon associated with stolbur and bois noir-related diseases of plants.**Int J Syst Evol Microbiol** (in press) abstract  Nejat, N., Vadamalai, G., Davis, R.E., Harrison, N.A., Sijam, K., Dickinson, M., Abdullah, S.N.A., and Zhao, Y.2013.'Candidatus Phytoplasma malaysianum', a novel taxon associated with virescence and phyllody of Madagascar periwinkle (Catharanthus roseus). **Int J Syst Evol Microbiol** (in press) abstract  Davis, R.E., Zhao, Y., Dally, E.L., Jomantiene, R., Lee, I.-M., Wei, W., and Kitajima, E.W. 2013.'Candidatus Phytoplasma sudamericanum', a novel taxon from diseased passion fruit (Passiflora edulis f. flavicarpa Deg.). **Int J Syst Evol Microbiol** 06/13/11 (Epub ahead) abstract
  **2010:** Davis,R.E., Dally,E., Zhao,Y., Lee,I.-M., Jomantiene,R., Detweiler,A.J. and Putnam,M.L. (2010).  First report of a new subgroup 16SrIX-E, 'Candidatus Phytoplasma phoenicium'-related, phytoplasma associated with juniper witches' broom disease in Oregon. **Plant Pathology**20:35.Jomantiene, R., Davis, R.E., Lee, I.-M., Zhao, Y., Bottner-Parker, K., Valiunas, D., Petkauskaite, R. (2010)  Onion is a host for two phytoplasma lineages, subgroups 16SrI-A and 16SrI-(B/L)L, in Lithuania: a *Hinf*I site revealed a SNP marking divergent branches of evolution.  **Journal of Plant Pathology**92:451-460.
   **2009:** Quaglino, F., Y. Zhao, P.A. Bianco, W. Wei, P. Casati, G. Durante, and R.E. Davis. (2009) New 16Sr subgroups and distinct single nucleotide polymorphism lineages among grapevine Bois noir phytoplasma populations. **Annals of Applied Biology**154:279-289. Valiunas, D., R. Jomantiene, and R.E. Davis. (2009) Establishment of a new phytoplasma subgroup, 16SrI-Q, to accommodate a previously undescribed phytoplasma found in diseased cherry in Lithuania. **Journal of Plant Pathology**91:71-75. Valiunas, D., R. Jomantiene, A. Ivanauskas, R. Abraitis, G. Staniene, Y. Zhao, and R.E. Davis. (2009) First report of a new phytoplasma subgroup, 16SrIII-T, associated with decline disease affecting sweet and sour cherry trees in Lithuania. **Plant Disease**93:550.abstract. Zhao, Y., Q. Sun, W. Wei, R.E. Davis, W. Wu, and Q. Liu. (2009) 'Candidatus Phytoplasma tamaricis'. Discovered in witches'-broom-diseased salt cedar (Tamarix chinensis Lour.).**Int. J. Syst. Evol. Microbiol.**59:2496-2504 Zhao, Y., Q. Sun, W. Wei, R.E. Davis, W. Wu, and Q. Liu. (2009) Construction of an interactive online phytoplasma classification tool, iPhyClassifier, and its application in analysis of the peach X-disease phytoplasma group (16SrIII). **Int. J. Syst. Evol. Microbiol.**58:2582-2593 2008:
  Cai, H., Wei, W., Davis, R.E., Chen, H., and Zhao, Y. (2008) Genetic diversity among phytoplasmas infecting Opuntia species: virtual RFLP analysis identifies new subgroups in the peanut witches'-broom phytoplasma group.**Int J Syst Evol Microbiol**58:1448-1457. Valiunas, D., M. Samuitiene, M. Navalinskiene, and  R. E. Davis.  2008.  Identification of viral and phytoplasmal agents responsible for diseases affecting plants of **Gaillardia Foug.**in LithuaniaAgronomy Research 6:109-118. Wei, W., Davis, R.E., Jomantiene, R., and Zhao, Y. (2008) Ancient, recurrent phage attacks and recombination events shaped dynamic sequence-variable mosaic structures at the root of phytoplasma genome evolution. **Proc Natl Acad Sci USA**105:11827-11832. Wei, W., Lee, I-M., Davis, R.E., Suo, X., and Zhao, Y. (2008) Automated RFLP pattern comparison and similarity coefficient calculation for rapid delineation of new and distinct phytoplasma 16S rDNA subgroup lineages. **Int J Syst Evol Microbiol**58: 2368 - 2377. Wei, W., Jiang, H., Yang, Y., Wang, Y., Davis, R.E., and Zhao, Y.  2008.  Molecular identification of a new phytoplasma strain associated with the first observation of jujube witches'-broom disease in northeastern China.  **Plant Disease**91:1364 **2007:** Comer, J., Fletcher, J.  Davis, R.E., Melcher, U.  2007.  Evolution of the spiroplasma P58 multigene family.  **Biochemical Genetics**45:25-32. Davis, R.E., R. Jomantiene, and Y. Zhao.  2007.  Dynamic structures in phytoplasma genomes: sequence-variable mosaics (SVMs) of clustered genes.  **Bulletin of Insectology**60(2):119-120. Jomantiene, R., Y. Zhao, and R.E. Davis. 2007. Sequence-variable mosaics: Composites of recurrent transposition characterizing the genomes of phylogenetically diverse phytoplasmas. **DNA and Cell Biology**26:557-564. Jomantiene, R. and R.E. Davis.  2007.  Repeated conserved sequences as genetic markers for phytoplasma detection.  **Bulletin of Insectology**60(2):259-260. Lee, I.-M., Zhao, Y., Davis, R.E., Wei, W., and Martini, M.  2007.  Prospects of DNA-based systems for differentiation and classification of phytoplasmas.  **Bulletin of Insectology**60:239-244 Valiunas, D., Urbanaviciene, L., Jomantiene, R., Davis, R.E. 2007. Molecular detection, classification, and Phylogenetic analysis of subgroup 16SrI-C phytoplasmas detected in diseased Poa and Festuca in Lithuania. **Biologija**, Vol. 18. No. 2. P. 63-66. Valiunas, D., Samuitiene, M., Rasomavicius, V., Staniulis, J., and Davis, R.E. 2007. Subgroup 16SrIII-F phytoplasma strains in an invasive plant species, Heracleum sosnowskyi, and an ornamental, Dictamnus albus. **Journal of Plant Pathology**89(1):137-140. Wei, W., Jiang, H., Yang, Y., Wang, Y., Davis, R.E., and Zhao, Y.  2007.  Molecular identification of a new phytoplasma strain associated with the first observation of jujube witches'-broom disease in northeastern China.  **Plant Disease**91:1364 Wei, W., Davis, R.E., Lee, I.-M., and Zhao, Y. 2007. Computer-simulated RFLP analysis of 16S rRNA genes: identification of ten new phytoplasma groups **Int. J. System. Evol. Microbiol**. 57:1855-1867. Wei, W., Cai, H., Chen, H., Davis, R.E., and Zhao, Y.  2007.  First report of a natural infection of Opuntia sp. by a 'Candidatus Phytoplasma asteris'-related phytoplasma in China.  **Plant Disease**91:461. Zhao, Y., Sun, Q., Davis, R.E., Lee, I-M., and Liu, Q. 2007. First report of witches'-broom disease in a Cannabis species and its association with a phytoplasma of elm yellows group (16SrV) **Plant Disease**91:227. **2006:** Davis, R.E., Jomantiene, R., Lee, I., Zhao, Y., Hammond, R., Shao, J.Y., Dally, E.L., Dawe, A., Davis, K., Nuss, D. 2006. Comparative genomics of 'Candidatus Phytoplasma asteris' and Acholeplasma palmae: common ancestral genes lost during phytoplasma evolution. **Proc. 16th Congress of the International Organization for Mycoplasmology**: 47. Davis, R.E., Jomantiene, R., Lee, I., Zhao, Y., Hammond, R., Shao, J.Y., Dally, E.L., Dawe, A., Davis, K., Nuss, D. 2006. An acholeplasma genome encodes enzymes with the potential to degrade and utilize plant cell wall components. **Phytopathology**96:S190. Dally, E.L., Barros T.S.L., Zhao, Y., Lin, S.P., Roe, B.A., and Davis, R.E.  2006.  Physical and genetic map of the Spiroplasma kunkelii CR2-3x chromosome.  **Canadian Journal of Microbiology**52, 857-867. abstract. Jomantiene, R., and Davie, R.E. 2006. Genes clustered in sequence-variable mosaics: a unique phenomenon in the genomes of phylogenetically diverse phytoplasmas. **Phytopathology**96:S191. Jomantiene, R., Natilla, A., Hammond, R., and Davis, R.E. 2006. Characterization, phylogeny, and in planta expression of a putative lipase gene from Malaysian periwinkle yellows (MPY) phytoplasma, a member of subgroup 16SrI-B. **Phytopathology**96:S56.
 FEMS Letters 255 (1):59-65 abstract.
 
  Lee, I.M., K.D. Bottner, J.E. Munyaneza, R.E. Davis, J. Crosslin, L. Du Toit, and T. Crosby. 2006. Carrot purple leaf: a new carrot disease associated with Spiroplasma citriand phytoplasmas in Washington. Plant Disease 90:989-993.   Samuitiene, M., Navalinskiene, M., Davis, R.E., and Jomantiene, R. 2006.Molecular characterization of diverse phytoplasmas of subgroups 16SrI-A, 16SrI-B, 16SrI-L, and 16SrI-M infecting ornamental plants in Lithuania. European Plant Protection Organization (EPPO) Bulletin 36:47-51.  Shao, J., Jomantiene, R., Dally, E.L., Zhao, Y., Lee, I.-M., Nuss, D., and Davis, R.E. 2006. NusA: Comparative properties, phylogeny, and use in detection of group 16SrI phytoplasmas. J. Plant Pathol. 88:193-201.   Valiunas, D., Staniulis, J., and Davis, R.E. 2006. 'CandidatusPhytoplasma fragariae', a new phytoplasma taxon discovered in yellows diseased strawberry, Fragaria x ananassa. Int. J. System. Microbiol. 56:277-281. abstract.  Wei, W., Opgenorth, D.C., Davis, R.E., Chang, C.J., and Zhao, Y. 2006. Characterization of a novel adhesion gene and design of a real-time polymerase chain reaction for rapid, sensitive, and specific detection of Spiroplasma kunkelii. Plant Disease 90:1233-1238.Full Text   2005: Davis, R.E., Jomantiene, R., and Zhao, Y. 2005. Lineage-specific decay of folate biosynthesis genes suggests on-going host adaptation in phytoplasmas. **DNA and Cell Biol. 24:832-840.**abstract.  Davis, R.E., Dally, E.L., Jomantiene, R., Zhao, Y., Roe, B., Lin, S., and Shao, J. 2005. Cryptic Plasmid pSKU146 from the Wall-less Plant Pathogen Spiroplasma kunkelii Encodes an Adhesin and Components of a Type IV Translocation-Related Conjugation System. PLASMID 53:179-190.abstract.  Liu, Q., Sun, Q., Wu, T., Davis, R.E., and Zhao, Y. 2005. First report of witches'-broom disease of Chinese wingnut ( Pterocarya stenoptera) in China and its association with a phytoplasma of aster yellows group (16SrI). Plant Disease 98:529.  Urbanaviciene, L., R. Jomantiene, and R.E. Davis. 2005. First report of barley as host of a phytoplasma belonging to group 16SrI, subgroup B, and ribosomal protein subgroup rpI-B in Lithuania. Plant Disease 89:339. abstract.   Zhao, Y., Davis, R.E., and Lee, I.-M. 2005. Phylogenetic positions of phytopathogenic mollicutes as inferred from multiple sets of concatenated core house-keeping proteins. Int. J. Systematic and Evol. Microbiol. 55:2131-2141.  2004: Firrao, G., and others. 2004. 'CandidatusPhytoplasma', a taxon for the wall-less, non-helical prokaryotes that colonize plant phloem and insects. Int. J. System. Evol. Microbiol. 54:1243-1255.   Jomantiene, R., and R.E. Davis. 2004. Apple sessile leaf: a new disease associated with a 'CandidatusPhytoplasma asteris' subgroup 16SrI-B phytoplasma in Lithuania. BSPP New Disease Reports 10: http://www.bspp.org.uk/ndr/jan2005/2004-77.asp  Lee IM, Gundersen-Rindal DE, Davis RE, K.D. Bottner KD, Marcone C, and Seem?ller E. 2004. 'CandidatusPhytoplasma asteris', a new phytoplasma taxon associated with aster yellows and related diseases. Int. J. Syst. Evol. Microbiol. 54:1037-1048.   Liu, Q., Wu, T., Davis, R.E., and Zhao, Y. 2004. First report of witches'-broom disease of Broussonetia papyriferaand its association with a phytoplasma of elm yellows group (16SrV). Plant Disease88:770.  Valiunas, D., A. Alminaite, R. Jomantiene, R.E. Davis, and J.L. Maas. 2004. Possible cause of European blueberry disease is related to North American milkweed yellows phytoplasma. J. Plant Pathology 86:135-140.  Valiunas, D., R. Jomantiene, and R.E. Davis. 2004. Identification of subgroup 16SrI-B phytoplasma from naturally infected pear in Lithuania. Horticulture and Vegetable Growing 23(4):29-36.  Urbanaviciene, L., R. Jomantiene, D. Valiunas, and R.E. Davis. 2004. Molecular detection of phytoplasmas in oats, barley, and Triticosecaleand their classification based on 16S rRNA gene polymorphisms. ?emes Ukio Mokslai 2004:15-19.   Urbanaviciene, I., R. Jomantiene, and R.E. Davis. 2004. First report of barley as host of a phytoplasma belonging to group 16SrI, subgroup B, and ribosomal protein subgroup B.Plant Disease 89:339.  Zhao, Y., H. Wang, R.W. Hammond, R. Jomantiene, Q. Liu, S. Lin, B.A. Roe, and R.E. Davis. 2004. Predicted ATP-binding cassette systems in the phytopathogenic mollicute Spiroplasma kunkelii. Mol. Gen. Genomics 271:325-338.  Zhao, Y., Davis, R.E., and Lee, I.-M.. 2005. Phylogenetic positions of phytopathogenic mollicutes as inferred from multiple sets of concatenated core house-keeping proteins .Intern. J. System. Evol. Microbiol. 55:2131-2141.  Zhao Y, Liu Q.,and Davis RE 2004. Transgene Expression in Diploid and Octoploid Strawberries Driven by a Heterologous Phloem-Specific Promoter.Plant Cell Reports 23:224-230.   2003: Davis, R. E., R. Jomantiene, Y. Zhao, and E. L. Dally. 2003. Folate Biosynthesis Pseudogenes, folP and folK, and an O-sialoglycoprotein Endopeptidase Gene Homolog in the Phytoplasma Genome. **DNA and Cell Biology**22(11):697-706. abstract.  Davis, R.E., R. Jomantiene, A. Kalvelyte, and E.L. Dally. 2003. Differential amplification of sequence heterogeneous ribosomal RNA genes and classification of the 'Fragaria multicipita' phytoplasma. **Microbiological Research**158:229-236. abstract.  Zhao, Y., Hammond, R.W., Jomantiene, R., Dally, E.L., Lee, I.M., Jia, H., Wu, H., pn, S., Zhang, P., Kenton, S., Najar, F.Z., Hua, A., Roe, B.A., Fletcher, J., and Davis, R.E. 2003. Gene content and organization of an 85-kb DNA segment from the genome of the phytopathogenic mollicute Spiroplasma kunkelii. **Mol. Genet. Genomics**. 269:592-602. abstract.  2002: Alminaite, A., R.E. Davis, D. Valiunas, and R. Jomantiene. 2002. First report of a group 16SrI, subgroup B, phytoplasma in diseased Epilobium hirsutum in the region of Tallin, Estonia. **Plant Disease**86:1177. Abstract. Barros, T.S.L., R.E. Davis, R.O. Resende, and E.L. Dally. 2002. Erigeron witches' broom phytoplasma in Brazil represents new subgroup VII-B in 16S rRNA gene group 16SrVII, the ash yellows phytoplasma group. **Plant Disease**86:1142-1148. Full Text.  Jomantiene, R., R.E. Davis, D. Valiunas, A. Alminaite, and J. Staniulis. 2002. New group 16SrIII phytoplasma lineages in Lithuania exhibit rRNA interoperon sequence heterogeneity. **European Journal of Plant Pathology**108:507-517. Jomantiene, R., R.E. Davis, A. Alminaite, D. Valiunas, and R. Jasinskaite. 2002. First report of oat (Avena sativa L.) as host of a phytoplasma belonging to group 16SrI, subgroup A. **Plant Disease**86:443. Abstract. Jomantiene, R., J.L. Maas, F. Takeda, and R.E. Davis. 2002. Molecular identification and classification of strawberry phylloid fruit phytoplasma in group 16SrI, new subgroup R. **Plant Disease**86:920. Abstract. Samuitiene, M., M. Navalinskiene, R.E. Davis, and R. Jomantiene. 2002. Molecular detection and characterization of a phytoplasma infecting daisy (Bellis perennis L.) plants in Lithuania. **Botanica Lithuanica**8:195-200. 2001: Barros, T.S.L., R.E. Davis, R.O. Resende, and E.L. Dally. 2001. Design of a polymerase chain reaction for specific detection of corn stunt spiroplasma. **Plant Disease**85:475-480. Davis, R.E., and E.L. Dally. 2001. Revised subgroup classification of group 16SrV phytoplasmas and placement of Flavescence dor?e-associated phytoplasmas in two distinct subgroups. **Plant Disease**85:790-797. Jomantiene R., J. L. Maas, R. E. Davis and E. L. Dally. 2001. Molecular identification and classification of a phytoplasma associated with phyllody of strawberry fruit in Maryland. **Plant Disease**85:335. Abstract. Montano H.G, R.E. Davis, E.L. Dally, S. Hogenhout, J.P. Pimentel, P.S. Brioso. 2001. 'Candidatus Phytoplasma brasiliense', a new phytoplasma taxon associated with hibiscus witches' broom disease. **Int J Syst Evol Microbiol.**51(Pt 3):1109-1118. abstract. Valiunas D., A. Alminaite, J. Staniulis, R. Jomantiene, and R. E. Davis. 2001. First report of aster yellows-related subgroup I-A phytoplasma strains in carrot, phlox, sea-lavender, aconitum, and hyacinth in Lithuania. **Plant Disease**85:804. Abstract. Valiunas D., A. Alminaite, J. Staniulis, R. Jomantiene, and R. E. Davis. 2001. First Report of Alder Yellows Phytoplasma in the Eastern Baltic Region. **Plant Disease**85:1120. Abstract. 2000:Jomantiene R., J. D. Postman, H. G. Montano, J. L. Maas, R. E. Davis, and K. B. Johnson. 2000. First report of clover yellow edge phytoplasma in Corylus (hazelnut). **Plant Disease**84:102. Abstract.Jomantiene R., R. E. Davis, L. Antoniuk, and J. Staniulis. 2000. First report of phytoplasmas in soybean, alfalfa, and Lupinus sp. in Lithuania. **Plant Disease**84:198. Abstract.Lee IM, Davis RE, Gundersen-Rindal DE. Phytoplasma: phytopathogenic mollicutes.**Annu Rev Microbiol**. 2000;54:221-55. abstract.Marcone C., I.M. Lee, R.E.Davis, A. Ragozzino, E. Seemuller. Classification of aster yellows-group phytoplasmas based on combined analyses of rRNA and tuf gene sequences. **Int J Syst Evol Microbiol**. 50: 1703-1113. abstract.Montano, H.G., R.E. Davis, E.L. Dally, J.P. Pimentel, and P.S.T. Brioso. 2000. Identification and phylogenetic analysis of a new phytoplasma from diseased chayote in Brazil. **Plant Disease**84:429-436. Full Text.Staniulis, J. B., Davis, R. E., Jomantiene, R., Kalvelyte, A., and Dally, E. L. 2000. Single and mixed phytoplasma infections in phyllody- and dwarf-diseased clover plants in Lithuania. **Plant Disease**84:1061-1066. Full Text.1999:Griffiths HM, Sinclair WA, Smart CD, Davis RE. 1999. The phytoplasma associated with ash yellows and lilac witches'-broom: 'Candidatus phytoplasma fraxini'. **Int J Syst Bacteriol**. 49:1605-1114. abstract.Jomantiene R., J. L. Maas, E. L. Dally, R. E. Davis, and J. D. Postman. 1999. First report of clover proliferation phytoplasma in strawberry.**Plant Disease**. 83:967. abstract.1998:Davis, R.E., R. Jomantiene, E.L. Dally, and T.K. Wolf. 1998. Phytoplasmas associated with grapevine yellows in Virginia belong to group 16SrI, subgroup A (tomato big bud phytoplasma subgroup), and group 16SrIII, new subgroup I. **Vitis**37:131-137.Davis, R.E., and W.A. Sinclair. 1998. Phytoplasma identity and disease etiology. **Phytopathology**88:1372-1376. Full Text.Jomantiene, R., R.E. Davis, J. Maas, E.L. Dally. 1998. Classification of new phytoplasmas associated with diseases of strawberry in Florida, based on analysis of 16 S rRNA and ribosomal protein gene operon sequences. **Int. J. Syst. Bacteriol**. 48:269-277. abstract.Jomantiene R., J. L. Maas, E. L. Dally, and R. E. Davis. 1998. First report of clover yellow edge and STRAWB2 phytoplasmas in strawberry in Maryland. **Plant Disease**. 83:1072 abstract.Jomantiene, R., R.E. Davis, E.L. Dally, J.L. Maas, and J.D. Postman. 1998. The distinctive morphology of 'Fragaria multicipita' is due to phytoplasma. **HortScience**33:1069-1072.Lee, I.-M., D.E. Gundersen-Rindal, R.E. Davis, and I.M. Bartoszyk. 1998. Revised classification scheme of phytoplasmas based on RFLP analyses of 16S rRNA and ribosomal protein gene sequences. **Int. J. Syst. Bacteriol.**48:1153-1169. abstract.1997:Davis RE, Dally EL, Gundersen DE, Lee IM, Habili N. 1997. "Candidatus phytoplasma australiense," a new phytoplasma taxon associated with Australian grapevine yellows.**Int. J. Syst. Bacteriol.**47(2):262-269. abstract.Davis, R.E., E.L. Dally, E. Tanne, and I.C. Rumbos. 1997. Phytoplasmas associated with grapevine yellows in Israel and Greece belong to the stolbur phytoplasma subgroup, 16SrXII-A. **J. Plant Pathol.**79:181-187.1994:Gundersen, D.E., I. M. Lee, S.A. Rehner, R.E. Davis, and D.T. Kingsbury. 1994. Phylogeny of mycoplasmalike organism (phytoplasmas): a basis for their classification. **J. Bacteriol.**176:5244-5254.1993:Davis, R.E., E.L. Dally, A. Bertaccini, I.M. Lee, R. Credi, R. Osler V. Savino, L. Carraro, B. Di Terlizzi, and M. Batra. 1993. Restriction fragment length polymorphism analyses and dot hybridizations distinguish mycoplasmalike organisms (MLOs) associated with flavescence dor?e and southern European grapevine yellows disease in Italy. **Phytopathology**83:772-776.Davis, R.E. and I.M. Lee. 1993. Cluster specific polymerase chain reaction amplification of 16S rDNA sequence for detection and identification of mycoplasmalike organisms. **Phytopathology**83:1008-1011.1992:Davis, R.E., W.A. Sinclair, I.M. Lee, and E.L. Dally. 1992. Cloned DNA probes specific for detection of a mycoplasmalike organism associated with ash yellows disease. **Mol. Plant Microbe Interact.**5:163-169.1991:Khew, K. L., R. E. Davis, C. A. Ong, I. M. Lee, H. J. Su, and M. C. Tsai. 1991. Detection of a Malaysian mycoplasmalike organism (MLO) and its differentiation from other Asian, European, and North American MLOs by use of cloned chromosomal and extrachromosomal MLO DNA probes. **J. Plant Prot. Tropics**8(3):167-180.1990:Davis, R. E., I. M. Lee, S. M. Douglas, and E. L. Dally. 1990. Molecular cloning and detection of chromosomal and extrachromosomal DNA of the mycoplasmalike organism associated with little leaf disease in periwinkle (Catharanthus roseus). **Phytopathology**80:789-793.1988:Davis, R. E., I. M. Lee, and J. Fletcher. 1988. Cell wall free prokaryotes. Spiroplasmas and mycoplasma like organisms. Pages 140 156. In: Laboratory Guide for Identification of Plant Pathogenic Bacteria, 2nd edition.(N. W. Schaad, ed.) APS Press, St. Paul, MN.1986:Lee, I. -M., and Davis, R. E. 1986. Prospects for in vitro culture of plant-pathogenic mycoplasmalike organisms. **Ann. Rev. Phytopathol.**24:339-354.1983:Davis, R. E., and Fletcher, J. 1983. Spiroplasma citri in Maryland: isolation from field grown plants of horseradish (Armoracia rusticana) with brittle root symptoms in Maryland. **Plant Disease**67:900-903.1982:Davis RE, Lee IM.Comparative properties of spiroplasmas and emerging taxonomic concepts: a proposal.**Rev. Infect. Dis.**1982 May-Jun;4 Suppl:S122-128.  full text1981:Davis, R. E., Lee, I. M., and Worley, J. F. 1981. Spiroplasma floricola, a new species isolated from surfaces of flowers of the tulip tree, Liriodendron tulipifera L. Int. J. System. Bacteriol.456-464.  full textDavis, R. E. 1981. The enigma of the flower spiroplasmas. In: **Mycoplasma Diseases of Trees.**(Maramorosch, K., and Raychaudjuri, S. P. eds.) Academic Press, New York.1980:Lee, I. -M., and Davis, R. E. 1980. DNA homology among diverse spiroplasma strains representing several serological groups. **Can. J. Microbiol.**26:1356-1363.1979:Davis, R. E. 1979. Spiroplasmas: Newly recognized arthropod-borne pathogens. Chapter 13. In: **Leafhopper Vectors and Plant Disease Agents.**(Maramorosch, K. and Harris, K. F. eds.) Academic Press, New York. 654 pages.1978:Davis, R. E., Lee, I. M., and Basciano, L. K. 1979. Spiroplasmas: Serological grouping of strains associated with plants and insects. **Can. J. Microbiol.**25:861-866.1973:Davis, R. E., and Worley, J. F. 1973. Spiroplasma: Motile, helical microorganism associated with corn stunt disease. **Phytopathology**63:403-408. full text1972:Davis, R. E., Worley, J. F., Whitcomb, R. F., Ishijima, R., and Steere, R. L. 1972. Helical filaments produced by a mycoplasmalike organism associated with corn stunt disease. **Science**176:521-523.1971:Davis, R. E. and Whitcomb, R. F. 1971. Mycoplasmas, rickettsiae, and chlamydiae: Possible relation to yellows disease and other disorders of plants and insects. **Ann. Rev. Phytopathology**9:119-154.1970:Davis, R. E. and Whitcomb, R. F. 1970. Evidence on possible mycoplasma like etiology of aster yellows disease. I. Suppression of symptom development in plants by antibiotics. **Infection and Immunity**2:201-208.1968Davis, R. E., Whitcomb, R. F., and Steere, R. L. 1968. Remission of aster yellows disease by antibiotics. **Science**161:793-795.2004


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