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Title
Abstract
Key Takeaways
Introduction
Biological Methods
Serological Methods
Conclusion
References

Sweet Potato Diseases: Diagnosis and Management

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2012, Fruit, Vegetable and Cereal Science and Biotechnology

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14 pages

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Abstract

Yield of sweet potato cultivars have appeared to gradually decline over the years in most of the sweet potato growing areas. This decline in yield and quality may be caused by a combination of several factors, including mutation, viruses and other pathogens. Several pathogens are known to cause diseases in sweet potato. Among them, the diseases caused by viruses are of worldwide economic importance. However, fungi, bacteria, viruses, nematodes and phytoplasma are known to attack sweet potato. Pathogenic bacteria, although not very common, are responsible for important economic losses. They affect vascular tissue as well as storage and fibrous roots, thus causing vine wilting and rots. Fungal pathogens are classified according to the type of disease they cause, such as foliar, stem, storage root and post harvest diseases. Even though the specific management practices have not been developed for various sweet potato diseases since the crop is propagated through vine cuttings, most of the viral and fungal diseases could be avoided by selecting healthy planting materials and sanitation. In the present chapter, an attempt has been made to review the worldwide diseases of sweet potato and the available management practices. This would be highly useful to take precaution to avoid spread and loss and for identifying the occurrence of new diseases.

Key takeaways
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  1. Sweet potato diseases significantly reduce yields, with viral infections causing 30-90% yield losses globally.
  2. Healthy planting material and sanitation are crucial for managing sweet potato diseases.
  3. Fungal pathogens account for major sweet potato diseases, including leaf spots and storage rots.
  4. SPFMV is the most economically important virus affecting sweet potato, causing severe quality issues.
  5. Systematic production of disease-free planting materials is essential for improving sweet potato productivity.

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References (150)

  1. Abad JA, Moyer JW (1992) Detection and distribution of sweet potato fea- thery mottle virus in sweet potato by in vitro transcribed RNA probes (ribo- probes), membrane immunobinding assay and direct blotting. Phytopathol- ogy 82, 300-305
  2. Abad JA, Conkling MA, Moyer JW (1992) Comparison of the capsid protein cistron from serologically distinct strains of sweet potato feathery mottle virus (SPFMV). Archives of Virology 126, 147-157
  3. Adams MJ, Antoni W, Fauquet CMF (2005) Molecular criteria for genus and species discrimination within the family Potyviridae. Archives of Virology 149, 459-479
  4. Alicai T, Fenby NS, Gibson RW, Adipola E, Vetten, HJ, Foster GD, Seal SE (1999) Occurrence of two serotypes of sweet potato chlorotic stunt virus in East Africa and their associated differences in coat protein and HSP 70 homologue gene sequences. Plant Pathology 48, 718-726
  5. Aritua V, Barg E, Adipala E, Gibson RW, Leseman DE, Vetten H (2009) Plant disease host range, purification, and genetic variability in sweet potato chlorotic fleck virus. Plant Disease 93, 87-93
  6. Arrendell S, Collins WW (1986) Reaction of sweet potato seedlings to the russet crack strain of feathery mottle virus. Horticulture Science 21, 1191- 1193
  7. Ateka EM, Njeru RW, Kibaru AG, Kimenju JW, Barg E, Gibson RW, Vetten HJ (2004) Identification and distribution of viruses infecting sweet potato in Kenya. Annals of Applied Biology 144, 371-379
  8. Atreya CD, Atreya PL, Thornbury DW, Pirone TP (1992) Site directed mutations in the Potyvirus HC-Pro gene affect helper component activity, virus accumulation and symptom expression in infected tobacco plants. Virology 191, 106-111
  9. Banks GK, Bedford ID, Beitia FJ, Rodriguez-Cerezo E, Markham PG (1999) A novel geminivirus of Ipomoea indica (Convolvulacae) from Sou- thern Spain. Plant Disease 83, 486
  10. Bilgrami KS, Jamaluddin, Rizwi (1979) Fungi of India Part I, Today and Tomorrow Publications, New Delhi, India, 467 pp
  11. Brayford D (1992) Fusarium oxysporum f.sp. albedinis. IMI descriptions of fungi and bacteria No. 1111, CAB International, Wallingford, UK
  12. Briddon RW, Bull SE, Bedford ID (2005) Occurrence of Sweet potato leaf curl virus in Sicily. Available online: http://www.bspp.org.ukindr/july2005/2005-44.asp
  13. Bruggen AHC van (1984) Sweet potato stem blight caused by Alternaria sp: A new disease in Ethiopia. Netherlands Journal of Plant Pathology 90, 155-164
  14. Brunt AA, Crabtree K, Dallwitz MJ, Gibbs AJ, Watson L (1996) Viruses of Plants: Descriptions and Lists from VIDE Database, CAB International, Cambridge, UK, 1484 pp
  15. Cali BB, Moyer JW (1981) Purification, serology and particle morphology of two russet crack strain of sweet potato feathery mottle virus. Phytopathology 71, 302-305
  16. Campbell RN, Hall DH, Mielinis NM (1974) Etiology of sweet potato russet crack disease. Phytopathology 64, 210-218
  17. Carey EE, Gibson RW, Fuentes S, Machmud M, Mwanga ROM, Turya- mureeba G, Zhang L, Ma D, Abo El-Abbas F, El-Bedewy R, Salazar LF (1999) The causes and control of virus diseases of sweet potato in developing countries: Is sweetpotato virus disease the main problem? In: IPC (Ed) Impact on a Changing World, program report 1997-1998, The International Potato Center, Lima, Peru, pp 241-248
  18. Carrington JC, Cary SM, Parks TD, Dougherty WG (1989) A second pro- teinase encoded by a plant potyvirus genome. The EMBO Journal 8, 365-370
  19. Carrington JC, Jensen PE, Schaad MC (1998) Genetic evidence for an essen- tial role for Potyvirus CI protein in cell to cell movement. Plant Journal 14, 393-400
  20. Cedano C, Fuentes S, Salazar LF (1989) Identification and some characteris- tics of sweet potato (Ipomoea batatas (L.) Lam.) feathery mottle virus iso- lates in Peru. Fitopatologia 24, 43-44
  21. Chatterjee A, Sinha SK, Roy A, Sengupta DN, Ghosh SK (2007) Develop- ment of diagnostics for DNA A and DNA ȕ of a Begomovirus associated with mesta yellow vein mosaic disease and detection of geminiviruses in mesta (Hibiscus cannabinus L. and H. sabdariffa L.) and some other plant species. Journal of Phytopathology 155, 683-689
  22. Chavi F, Robertson AI, Verduin BJM (1997) Survey and characterization of viruses in sweet potato from Zimbabwe. Plant Disease 81, 1115-1122
  23. Chen MJ (1972) Electron microscopic studies of plant pathogenic mycoplasma found in Taiwan. Proceedings of the National Science Council, Republic of China 5, 61-77
  24. Cipriani G, Fuentes S, Bello V, Salazar LF, Ghislain M, Zhang DP (2001) Transgene expression of rice cysteine protein inhibitors for the development pf resistance against sweet potato feathery mottle virus. In: IPC (Ed) Scientist and Farmer: Partners for the Research for the 21 st Century, The Internatio- nal Potato Center, Lima, Peru, pp 267-271
  25. Clark CA, Hoy MW (1994) Isolation of Fusarium lateritium from sweet potato seed. Plant Disease 78, 585-587
  26. Clark CA, Hoy MW (2006) Effects of common viruses on yield and quality of Beauregard sweet potato in Louisiana. Plant Disease 90, 83-88
  27. Clark CA, Moyer JW (1988) Compendium of Sweet Potato Diseases, APS Press, The American Phytopathology Society, St. Paul, MN, USA, 74 pp
  28. Clark CA, Chen C, Ward-Rainey N, Pettis GS (1998) Diversity within Strep- tomyces ipomoeae based on inhibitory interactions, rep-PCR, and plasmid profiles. Phytopathology 88, 1179-1186
  29. Clark CA, Valverde RA, Fuentes S, Salazar LF, Moyer JW (2002) Research for improved management of sweet potato pests and diseases: cultivar dec- line. Acta Horticulturae 583, 103-112
  30. Clark CA, LaBonte DR, Valverde, RA, Hoy MW, Lotrakul P, Kokkinos C, McGregor C (2003) Technology to improve the quality of sweet potato 'seed'. Louisiana Agriculture 46, 29-31
  31. Clark CA, Holmes GJ, Ferrin DM (2009) Major fungal and bacterial diseases. In: Loebenstein G, Thottappilly G (Eds) The Sweet Potato, Springer Science + Business Media BV, Berlin, pp 81-104
  32. Cohen J, Franck A, Vetten HJ, Lesemann DE, Loebenstein G (1992) Puri- fication and properties of closterovirus like particles associated with a white- fly transmitted disease of sweet potato. Annals of Applied Biology 121, 257- 268
  33. Cohen J, Milgram M, Antignus Y, Pearlsman M, Lachman O, Loebenstein G (1997) Ipomoea crinkle leaf curl caused by a whitefly transmitted gemini like virus. Annals of Applied Biology 131, 273-282
  34. Cohen J, Lapidot M, Loebenstein G, Gera A (2001) Sweet potato sunken vein virus occurring in Lisianthus. Plant Disease 85, 679
  35. Cohen J, Lobestein G, Spiegel S (1988) Infection of sweet potato by cucumber mosaic virus depends on the presence of virus whitefly transmitted agent. Plant Disease 72, 583-585
  36. Colinet D, Kummert J (1993) Identification of a sweet potato feathery mottle virus isolate from China (SPFMV-CH) by the polymerase chain reaction with degenerate primers. Journal of Virological Methods 45, 149-159
  37. Colinet D, Kummert J, Lepoivre P (1994) The complete nucleotide sequences of the coat protein cistron and the 3ƍ non-coding region of a newly-identified Potyvirus infecting sweet potato, as compared to those of sweet potato feathery mottle virus. Archives of Virology 139, 327-336
  38. Colinet D, Kummert J, Lepoivre P (1998b) The nucleotide sequence and genome organization of the whitefly transmitted sweet potato mild mottle virus: A close relationship with members of the family Potyviridae. Virus Research 53, 187-196
  39. Colinet D, Nguyen M, Kummert J, Lepoivre P (1998a) Differentiation among Potyvirus infecting sweet potato based on genus and virus specific reverse transcription polymerase chain reaction. Plant Disease 82, 223-229
  40. Cuellar WJ, de Souza J, Barrantes I, Fuentes S, Kreuze JF (2011) Distinct cavemoviruses interact synergistically with sweet potato chlorotic stunt virus (genus Crinivirus) in cultivated sweet potato. Journal of General Virology 92, 1233-1243
  41. Dabek AJ, Sagar C (1978) Witches' broom chlorotic little leaf of sweet potato in Guadalcanal, Solomon Islands, possibly caused by mycoplasma like orga- nisms. Phytopathology Z 92, 1-11
  42. Di Feo L, Nome SF, Biderbost E, Fuentes S, Salazar L (2000) Etiology of sweet potato chlorotic dwarf disease in Argentina. Plant Disease 84, 35-39
  43. Doolittle SP, Harter LL (1945) A graft transmissible virus of sweet potato. Phytopathology 35, 695-704
  44. Dougherty WG, Cary SM, Park TD (1989) Molecular genetic analysis of plant virus polyprotein cleavage sites: A model. Virology 171, 356-364
  45. Duarte V, Clark CA (1992) Presence on sweet potato through the growing sea- son of Erwinia chrysanthemi, cause of stem and root rot. Plant Disease 76, 67-71
  46. Esbanshade PR, Moyer JW (1982) Indexing for sweet potato feathery mottle virus in sweet potato using enzyme linked immune sorbent assay. Plant Dis- ease 66, 911-913
  47. FAO Stat (2011) FAO statistical database. URL http://apps.fao.org/ Fauquet CM, Bisaro DM, Briddon RW, Brown JK, Harrison BD, Rybicki EP, Stenger DC, Stanley J (2003) Revision of taxonomic criteria for species demarcation in the family Geminiviridae and updated list of begomovirus species. Archives of Virology 148, 405-421
  48. Fuentes S, Salazar LF (1996) Virus diseases of sweet potato: Genetic resis- tance. In: Loebenstein G (Ed) Final Report (GIARA 92-1): Characterization of sweet potato viruses and their significance to sweet potato production in Kenya, Volcani Centre, Israel, pp 157-163
  49. Fuentes S, Salazar LF (2003) First report of sweet potato leaf curl virus in Peru. Plant Disease 87, 98
  50. Fuentes S, Mayo MA, Jolly CA, Makano M, Querci M, Salazar LF (1996) A novel Luteovirus from sweet potato, sweet potato leaf speckling virus. Annals of Applied Biology 128, 491-504
  51. Fuglie KO (2007) Priorities for sweet potato research in developing countries: Results of a survey. Horticulture Science 42, 1200-1206
  52. Ganga G (2009) Sweet potato viruses: Development of molecular based methods for detection. PhD thesis, University of Kerala, Thiruvananthapuram, Kerala, India, 224 pp
  53. Gao F, Gong YF, Zhang PB (2000) Production and development of virus free sweet potato in China. Crop Protection 19, 105-111
  54. Gibb KS, Padovan AC, Mogen BD (1995) Studies on sweet potato little leaf phytoplasma detected in sweet potato and other plant species growing in Northern Australia. Phytopathology 85, 169-174
  55. Gibson RW, Aritua V (2002) The perspective of sweet potato chlorotic stunt virus in sweet potato production in Africa, a review. African Crop Science Journal 10, 281-310
  56. Gibson RW, Mpembe I, Alicai T, Carey EE, Mwanga ROM, Seal SE, Vetten HJ (1998) Symptoms, aetiology and serological analysis of sweet potato virus disease in Uganda. Plant Pathology 47, 95-102
  57. Gonzalez MS, Fuenmayor F, Godoy F, Navas R (2003) First report of Fusa- rium denticulatum from sweet potato in Venezuela. Plant Disease 87 (2), 202
  58. Green SK, Kuo YJ, Lee DR (1988) Uneven distribution of two potyviruses (feathery mottle virus and sweet potato latent virus) in sweet potato plants and its implication on virus indexing of meristem derived plants. Tropical Pest Management 34, 298-302
  59. Green SK, Luo CY, Lee DR (1989) Elimination of mycoplasma like organisms from Witches' broom infected sweet potato. Journal of Phytopathology 126, 204-212
  60. Grisoni M, Moles K, Farreyrol L, Rassaby R, Pearson DM (2006) Identi- fication of potyviruses infecting vanilla by direct sequencing of a short RT- PCR amplicon. Plant Pathology 55, 523-529
  61. Gutiérrez DL, Fuentes S, Salazar LF (2003) Sweet potato virus disease (SPVD): Distribution, incidence and effect on sweet potato yield in Peru. Plant Disease 87, 297-302
  62. Hahn SK (1979) Effects of viruses (SPVD) on growth and yield of sweet potato. Experimental Agriculture 15, 253-256
  63. Hansford CG (1944) A probable virus disease of sweet potato. The East Afri- can Agricultural Journal 44, 126-127
  64. Hegde V, Ganga P, Makeshkumar T, Jeeva ML, Edison S (2007a) Cloning and expression of coat protein gene of sweet potato feathery mottle virus in E. coli. In: 10 th International Plant Virus Epidemiology Symposium on Con- trolling Epidemics of Emerging and Established Plant Virus Diseases -The Way Forward, ICRISAT, Hyderabad, 15 pp
  65. Hegde V, Makeskumar T, Jeeva ML, Edison S (2007b) Development of molecular diagnostics for sweet potato feathery mottle virus. In: Internatio- nal Conference on Emerging and Re-emerging Viral Diseases of the Tropics And Sub Tropics, New Delhi, India, 36 pp
  66. Hegde V, Jeeva ML, Misra RS, Makeshkumar T, Veena SS (2010) Diag- nostics for Diseases of Tropical Tuber Crops. Technical Bulletin Series No 50, CTCRI, Thiruvananthapuram, Kerala, India, 56 pp
  67. Holliday P (1970) Fusarium oxysporum f.sp. batatas. CMI descriptions of pathogenic fungi and bacteria No. 212, 1 p
  68. Hollings M, Brunt AA (1981) Potyviruses. In: Amsterdam KE (Eds) Handbook of Plant Virus Infections: Comparative Diagnosis, Elsevier, North-Holl, the Netherlands, pp 731-807
  69. Hollings M, Stone OM, Bock KR (1976) Purification and properties of sweet potato mild mottle, a whitefly borne virus from sweet potato (Ipomoea bata- tas) in East Africa. Annals of Applied Biology 82, 511-528
  70. Hoyer U, Maiss E, Jelkman W, Lesemann DE, Vetten HJ (1996) Identifica- tion of the coat protein gene of a sweet potato sunken vein vlosterovirus iso- late from Kenya and evidence for a serological relationship among geo- graphically diverse Closterovirus isolates from sweet potato. Phytopathology 86, 744-750
  71. IsHak JA, Kreuze JF, Johansson A, Mukasa SB, Tairo F, Abo El-Abbas FM, Valkonen JPT (2003) Some molecular characteristics of three viruses in sweet potato virus disease-affected sweet potato plants in Egypt. Archives of Virology 148, 2449-2460
  72. Jackson GVH, Zettler FW (1983) Sweet potato Witches' broom and legume little leaf diseases in the Solomon Islands. Plant Disease 67 (9), 1141-1144
  73. Jeeva ML (2002) Characterization, host range and management of sweet potato feathery mottle disease. PhD thesis, College of Agriculture, Vellayani, Thiru- vananthapuram, Kerala, India, 64 pp
  74. Jeeva ML, Balakrishnan S, Edison S, Rajmohan K (2004a) Meristem culture and thermotherapy in the management of sweet potato feathery mottle virus. Journal of Root Crops 30, 135-142
  75. Jeeva ML, Balakrishnan S, Edison S, Solomon JJ (2004b) A simple electron microscopic technique for rapid assay of sweet potato feathery mottle virus (SPFMV). Journal of Mycology and Plant Pathology 34, 2300-2301
  76. Jeong JH, Chakrabarty D, Kim YS, Eun JS, Choi YE, Peak KY (2003) A simple detection of sweet potato feathery mottle virus by reverse transcrip- tion polymerase chain reaction. Journal of Plant Biotechnology 5, 83-86
  77. Jubert TG, La G, Klesser PJ, Nel DD (1979) The cultivation of sweet pota- toes: the value of indexed material. In: HRI (Ed) Farming in South Africa 1V, Sweet Potatoes Series: The Cultivation of Vegetables in South Africa, Horti- cultural Research Institute, Pretoria, pp 1-3
  78. Kahn RP, Monroe RL (1969) Detection of sweet potato little leaf agent (Wit- ches' broom) associated with a mycoplasma like organism. FAO Plant Pro- tection Bulletin 17, 104-106
  79. Kapinga R, Ndunguru J, Mulokozi G, Tumwegamire S (2009) Impact of common sweet potato viruses on total carotenoids and root yields of an orange fleshed sweet potato in Tanzania. Scientia Horticulturae 122, 1-5
  80. Karyeija RF, Gibson RW, Valkonen JPT (1998) The significance of sweet potato feathery mottle virus in subsistence sweet potato production in Africa. Plant Disease 82, 4-15
  81. Karyeija RF, Gibson RW, Valkonen JPT (1998) Resistance in sweet potato virus disease (SPVD) in wild East African Ipomoea. Annals of Applied Biol- ogy 133, 39-44
  82. Karyeija RF, Kreuze JF, Gibson RW, Valkonen JPT (2000a) Two serotypes of sweetpotato feathery mottle virus in Uganda and their interaction with resistant sweet potato cultivars. Phytopathology 90, 1250-1255
  83. Karyeija RF, Kreuze JF, Gibson RW, Valkonen JPT (2000b) Synergistic interactions of a Potyvirus and a phloem limited Crinivirus in sweet potato plants. Virology 269, 26-36
  84. Kays SJ (2005) Sweet potato production worldwide: assessment, trends and the future. Acta Horticulturae 670, 19-25
  85. Kennedy GG, Moyer JW (1982) Aphid transmission and separation of two strains of sweet potato feathery mottle virus from sweet potato. Journal of Economic Entomology 75, 113-133
  86. Kim SJ, Ryu KH, Choi JK, Park WM (1998) Sequence analysis of coat protein and 3'-noncoding region for Korean and other strains of sweet potato feathery mottle virus. Molecules Cells 6, 777-785
  87. Kokkinos CD (2006) Assessment of interactions among viruses infecting sweet potato. PhD thesis, Louisiana State University and Agricultural and Mecha- nical College, pp 56-58
  88. Kokkinos CD, Clark CA (2004) Assessment of interactions among important sweet potato virus using real time quantitative PCR. Phytopathology 94, S54
  89. Kokkinos CD, Clark CA (2006a) Real time PCR assays for detection and quantification of sweetpotato viruses. Plant Disease 90, 783-788
  90. Kokkinos CD, Clark CA (2006b) Interactions among sweet potato chlorotic stunt virus and different potyviruses and potyvirus strains infecting sweet potato in the United States. Plant Disease 90, 1347-1352
  91. Kreuze JF, Karyeija RF, Gibson RW, Valkonen JPT (2000) Comparisons of coat protein gene sequences show that East African isolates of sweet potato feathery mottle virus form a genetically distinct group. Archives of Virology 145, 567-574
  92. Kreuze JF, Savenkov EI, Valkonen JPT (2002) Complete genome sequence and analyses of the subgenomic RNAs of sweet potato chlorotic stunt virus reveal several new features for the genus Crinivirus. Journal of Virology 76, 9260-9270
  93. Kumar CA, Mandal BB, Chandel KPS, Jain RK, Varma A, Srivastava M (1991) Occurrence of sweet potato feathery mottle virus in germpalsm of Ipomea batatas in India. Current Science 60, 321-325
  94. Kumar M, Tarafdar J (2009) Complete nucleotide sequence of DNA segment A of sweet potato leaf curl virus isolate from India (SPLCV-BCKV) and its relationship with allied member of the begomoviruses. Available online: http://www.ncbi.nlm.nih.gov/ nuccore/258644166
  95. Lenne JM (1991) Diseases and Pests of Sweet Potato, National Resources Institute, Bulletin 46, 116 pp
  96. Li R, Salih S, Hurtt S (2004) Detection of geminiviruses in sweet potato by polymerase chain reaction. Plant Disease 88, 1347-1351
  97. Liao CH, Chien IC, Chung ML, Chin RJ, Han YH (1979) A study of sweet potato virus disease in Taiwan. I. Sweet potato yellow spot virus disease. Journal of Agricultural Research of China 28, 127-138
  98. Lo JY, Clark CA (1988) Sources of inoculum and infection courts of Diplodia gossypina on sweet potato. Phytopathology 78, 1442-1446
  99. Loebenstein G, Fuentas S, Cohen J, Salazar LF (2003) Sweet potato. In: Lobenstein G, Thottappilly G (Eds) Virus and Virus Like Disease of Major Crops in Developing Countries, Kluwer Academic Publishers, Dordrecht, The Netherlands, pp 223-248
  100. Loebenstein G, Thottappilly G, Fuentes S, Cohen J, Salazar LF (2009) Virus and phytoplasma diseases. In: Lobenstein G, Thottappilly G (Eds) The sweet potato, Springer Science + Business Media BV, Berlin, pp 105-134
  101. Lopes CA, Boiteux LS (1994) Leaf spot and stem blight of sweet potato caused by Alternaria bataticola. A new record to South America. Plant Disease 78, 1107-1109
  102. Lotrakul P, Valverde RA (1999) Cloning of a DNA-A-like genomic com- ponent of sweet potato leaf curl virus: nucleotide sequence and phylogenetic relationships. Available online: http://www.bspp.org.uk/mppol/1999/0422lotrakul/paper.htm
  103. Lotrakul P, Valerde RA, Clark CA, Sim J, de la Torre R (1998) Detection of a Geminivirus infecting sweet potato in the United States. Plant Disease 82, 1253-1257
  104. Lotrakul P, Valverde RA, Clark CA, Fauquet CM (2003) Properties of a Begomovirus isolated from sweet potato infected with sweet potato leaf curl virus. Revista Mexicana de Fitopatologia 21, 128-136
  105. Lozano G, Nunez A, Valverde R, Navas-Castillo J (2004) Begomoviruses in- fecting sweet potato in Spain. In: Proceedings, 2 nd European Whitefly Sym- Okada, Y, Saito A, Nishiguchi M, Kimura T, Mori M, Hanada K, Sakai J, Miyazaki C, Matsuda Y, Murata T (2001) Virus resistance in transgenic sweet potato (Ipomoea batatas L. (Lam)) expressing the coat protein gene of sweet potato feathery mottle virus. Theoretical and Applied Genetics 103, 743-751
  106. Onuki M, Honda Y, Hanada K (2000) Geminate particle morphology of sweet potato leaf curl virus in partially purified preparation and its serological rela- tionship to two Begomoviruses by western blotting. Journal of General Plant Pathology 2, 182-184
  107. Onuki M, Hanada K (1998) PCR amplification and partial nucleotide sequen- ces of three dicot infecting geminiviruses occurring in Japan. Annals of the Phytopathological Society of Japan 64, 116-120
  108. Ooshiro A, Kawano S, Takushi T, Oomi N, Tokeshi M, Ooshiro N (2006) Control of soil rot of sweet potato by the incorporation of the fresh aerial tissue of Geranium camlinianum L. into the soil. Weed Biology and Manage- ment 6, 241-244
  109. Owour O (2001) Local trails for virus free sweet potato. In: Kuza S, Kandi S, Kinua M (Eds) A Monthly News Letter Produced by Monsanto, Central Africa, 41 pp
  110. Paprotka T, Boiteux LS, Fonseca MEN, Resende RO, Jeske H, Faria JC, Ribeiro SG (2010) Genomic diversity of sweet potato geminiviruses in Bra- zilian germplasm bank. Virus Research 149, 224-233
  111. Pearson MN, Keane PJ, Thagalingham K (1984) Little leaf: A disease of sweet potato in Papua New Guinea probably caused by mycoplasma like organisms. Phytopathology Z 109, 269-276
  112. Prasanth G, Hegde V (2008) Occurrence of sweet potato feathery mottle virus and sweet potato leaf curl Georgia virus on sweet potato in India. Plant Dis- ease 92, 311
  113. Ray RC, Balagopalan C (1997) Post Harvest Spoilage of Sweet Potato, Tech- nical Bulletin series No. 23, Central Tuber Crops Research Institute, Thiru- vananthapuram, Kerala, India, 31 pp
  114. Ray RC, Edison S (2005) Microbial spoilage of stored sweet potato (Ipomoea batatas) roots in the tropics and control measures. Journal of Mycopatho- logical Research 43 (2), 147-158
  115. Ray RC, Misra RS (1995) Spoilage of sweet potato tubers in tropics. 1. Micro- organisms associated. Advances in Horticultural Science 9, 9-22
  116. Riechmann JL, Lain S, Garcia JA (1992) Highlights and prospects of Poty- virus molecular biology Journal of General Virology 73, 1-16
  117. Ryu KH, Kim SJ, Park WM (1998) Nucleotide sequence analysis of the coat protein genes of two Korean isolate of sweet potato feathery mottle potyvirus. Archives of Virology 143, 557-562
  118. Sakai J, Mori M, Morishita T, Tanaka M, Hanada K, Usugi T, Nishiguchi M (1997) Complete nucleotide sequence and genome organization of sweet- potato feathery mottle virus (S strain) genomic RNA: The large coding region of the P1 gene. Archives of Virology 142, 1553-1562
  119. Salem MA, Rao PN (1957) Fungi of Hyderabad (Deccan). Journal of the Indian Botanical Society 36, 421-427
  120. Salazar LF, Fuentes S (2001) Current knowledge on major virus diseases of sweet potatoes. In: Nakazawa Y, Ishiguro K (Eds) Proceedings of Inter- national Workshop on Sweet Potato Cultivar Decline Study, September 8-9, 2000, Miyakonojo, Japan, pp 14-19
  121. Samson R, Legrandre JB, Christen R, Fischer-Le Saux M, Achouak W, Gardan L (2005) Transfer of Pectobacterium chrysanthemi and Brenneria paradisiaca to the genus Dickeya gen. nov. as Dickeya chrysanthemi comb. nov. and Dickeya paradisiaca comb. nov. and delineation of four novel spe- cies, Dickeya dadantii sp. nov., Dickeya dianthicola sp. nov., Dickeya dief- fenbachiae sp. nov. and Dickeya zeae sp. nov. International Journal of Syste- matic and Evolutionary Microbiology 55, 1415-1427
  122. Saqib M, Bayliss KL, Jones MGK (2006) Identification of sweet potato little leaf phytoplasma associated with Vigna unguiculata var. sesquipedalis and Lycopersicon esculentum. Australasian Plant Pathology 35 (3), 293-296
  123. Schaefers GA, Terry ER (1976) Insect transmission of sweet potato disease agents in Nigeria. Physiopathology 66, 642-645
  124. Shukla DD, Ward CW, Brunt AA (1994) The Potyviridae, CAB International, Little Hampton, UK, pp 56
  125. Sinha RKP, Mehta PP (1982) A new host, Ipomoea batatas, of Cercospora ipomoeae from India. Indian Phytopathology 35 (4), 679-680
  126. Sim J, Valverde RA, Clark CA (2000) Whitefly transmission of sweet potato chlorotic stunt virus. Plant Disease 84, 1250
  127. Sinha DC, Misra AP (1974) Performance of sweet potato varieties against Fusarium wilt Indian Phytopathology 27, 615
  128. Sinha DC, Yadav CP (1977) Efficacy of fungicides tor the control of Cerco- spora leaf spot of sweet potato (Ipomoea batatas) caused by Cercospora ipomoeae. Journal of Root Crops 3 (1), 63-64
  129. Sivaprakasam K, Kandaswamy TK (1983) Collar rot of sweet potato. Madras Agricultural Journal 70 (3), 205
  130. Sivaprakasam K, Krishnamohan G, Kandaswamy TK (1977) A new leaf spot disease of sweet potato. Science and Culture 43, 325-326
  131. Sivaprakasam K, Thamburaj S, Ramaswamy N (1980) Varietal reactions of sweet potato to leaf spot. In: TNAU (Ed) Proceedings of National Sym- posium on Tuber Crops Production Technology, TNAU, Coimbatore, Tamil Nadu, India, pp 153-154
  132. Souto ER, Sim J, Valverde RA, Clark CA (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
  133. Stainbaeur CE, Kushman LJ (1971) Sweet Potato Culture and Disease Agri- culture Hand Book, Agriculture Research Service, United States Department of Agriculture, Washington D.C., USA, 388 pp
  134. Tairo F, Jones RAC, Valkonen JPT (2006) Potyvirus complexes in sweet potato: Occurrence in Australia, serological and molecular resolution, and analysis of the sweet potato virus 2 (SPV2) components. Plant Disease 90, 1120-1128
  135. Tairo F, Mukasa SB, Jones RAC, Kullaria A, Rubaihayo PR, Valkonen JPT (2005) Unraveling the genetic diversity of the three main viruses involved in sweet potato virus disease (SPVD), and its practical implications. Molecular Plant Pathology l6, 199-211
  136. Takeshi S (2002) Detection of sweet potato feathery mottle virus (SPFMV) in sweet potato by reverse transcription and polymerase chain reaction (RT- PCR). Bulletin of the Chiba Agriculture Research Center 1, 109-116
  137. Thankappan M, Nair NG (1990) New disease syndromes in sweet potato. Journal of Root Crops 16, 212-215
  138. Thankappan M (1994) Fungal diseases of sweet potato In: Chadha KL, Nayar GG (Eds) Advances in Horticulture (Vol 8) Tuber Crops, Malhothra Pub- lishing House, New Delhi, India, pp 387-396
  139. Untiveros M, Fuentes S, Krueze J (2007a) Molecular variability of sweet potato feathery mottle virus and other Potyvirus infecting sweet potato in Peru. Archives of Virology online
  140. Untiveros M, Fuentes S, Salazar LF (2007b) Synergistic interaction of sweet potato chlorotic stunt virus (Crinivirus) with Carla-, Cucumo-, Ipomo-, and potyviruses infecting sweet potato. Plant Disease 91, 669-676
  141. Usugi T, Nakano M, Onuki M, MaokaT, Hayashi T (1994) A new strain of sweet potato feathery mottle virus that causes russet crack on fleshy roots of some Japanese cultivars of sweet potato. Annals of Phytopathological Society Japan 60, 545-554
  142. Valverde RA, Clark CA, Valkonen JPT (2007) Viruses and virus disease complexes of sweet potato. Plant Viruses 1, 116-126
  143. Valverde RA, Clark CA, Kokkinos CD, Gutierrez DL (2008) Sweet potato viral diseases. In: Rao GP, Khurana SMP, Lenardon SL (Eds) Characteriza- tion, Diagnosis, and Management of Plant Viruses: Industrial Crops, Stu- dium Press LLC, Houston, Texas, USA, pp 251-272
  144. Valverde RA, Kokkinos CD, Clark CA (2004a) Sweet potato leaf curl virus detection by molecular hybridization. Phytopathology 94, S105
  145. Valverde RA, Sim J, Lotrakul P (2004b) Whitefly transmission of sweet potato viruses Virus Research 100, 123-128
  146. Van Velsen RJ (1967) 'Little leaf', a virus disease of Ipomoea batatas in Papua and New Guinea Papua New Guinea Agricultural Journal 18, 126-128
  147. Wambugu F (2004) Notes in New Scientist, No. 2433, 181 pp Wang QC, Valkonen JPT (2008) Elimination of two viruses which interact synergistically from sweet potato by shoot tip culture and cryotherapy. Jour- nal of Virological Methods 154, 135-145
  148. Wang Q, Zhang L, Wang B, Yin Z, Feng C, Wang Q (2010) Sweet potato viruses in China. Crop Protection 29, 110-114
  149. Zhang LM, Wang QM, Ma DF, Wang Y (2006) The effect of major viruses and virus free planting materials on sweet potato root yield in China. Acta Horticulturae 703, 71-77
  150. Zhang L, Wang Q, Liu Q, Wang Q (2009) Sweet potato in China. In: Loeben- stein G, Thottappilly G (Eds) The Sweet Potato, Springer Science + Business Media BV, Berlin, pp 325-358

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