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.
| 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 |
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 bud union. 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 – via ISI Web of Science.
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