Citrus gummy bark viroid

Citrus gummy bark viroid
Virus classification
(unranked):	Virus
Realm:	incertae sedis
Kingdom:	incertae sedis
Phylum:	incertae sedis
Class:	incertae sedis
Order:	incertae sedis
Family:	Pospiviroidae
Genus:	Hostuviroid
Species:	Hop stunt viroid
Strain:	Citrus gummy bark viroid

The citrus gummy bark viroid (abbreviated CGBVd) is a strain of Hop stunt viroid, and thus is a member of the genus Hostuviroid.

As the name suggests, the citrus gummy bark viroid causes problems in the bark of the sweet orange tree.^[1]

Scraping the bark exposes localized spots or a line of reddish-brown, gum-impregnated tissue around the scion circumference especially visible near the . The discoloration and gumming may extend above the bud union to the main branches of the sweet orange while in severe infection dark streaks of gum-impregnated tissue may also be observed in longitudinal sections.^[2]

References[]

^ Sofy, A.R.; Soliman, A.M.; Mousa, A.A.; Ghazal, S.A.; El-Dougdoug, K.A. (2010). "First record of Citrus viroid II (CVd-II) associated with gummy bark disease in sweet orange (Citrus sinensis) in Egypt". New Disease Reports. 21: 24. doi:10.5197/j.2044-0588.2010.021.024.
^ Onelge, N.; Cinar, A.; Szychowski, J.A.; Vidalakis, G.; Semancik, J.S. (2004). "Citrus viroid II variants associated with 'Gummy Bark' disease". European Journal of Plant Pathology. 110 (10): 1047–1052. doi:10.1007/s10658-004-0815-2. ISSN 0929-1873. S2CID 27567491 – via ISI Web of Science.

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[1] Sofy, A.R.; Soliman, A.M.; Mousa, A.A.; Ghazal, S.A.; El-Dougdoug, K.A. (2010). "First record of Citrus viroid II (CVd-II) associated with gummy bark disease in sweet orange (Citrus sinensis) in Egypt". New Disease Reports. 21: 24. doi:10.5197/j.2044-0588.2010.021.024.

[2] Onelge, N.; Cinar, A.; Szychowski, J.A.; Vidalakis, G.; Semancik, J.S. (2004). "Citrus viroid II variants associated with 'Gummy Bark' disease". European Journal of Plant Pathology. 110 (10): 1047–1052. doi:10.1007/s10658-004-0815-2. ISSN 0929-1873. S2CID 27567491 – via ISI Web of Science.

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