Citrus exocortis
| Citrus exocortis viroid | |
|---|---|
Virus classification 
| |
| (unranked): | Viroid |
| Family: | Pospiviroidae |
| Genus: | Pospiviroid |
| Species: | Citrus exocortis viroid
|
Citrus exocortis is a disease of citrus plants, caused by the Citrus exocortis viroid (CEVd, Pospiviroid exocortiscitri). It can cause stunted growth and reduced yields in affected plants. The disease is also sometimes called "scalybutt".[1] CEVd can also infect tomato plants. The resulting disease is sometimes called "tomato bunchy top disease".[2][3]
Symptoms
[edit]Other symptoms include leaf epinasty, stunting, and necrosis of the leaf midvein. Affected trees will show rootstock "shelling" where the bark peels off of the rootstock – the lower tree that the main orange cultivar was grafted onto. Generally trifoliate orange rootstocks and their hybrids are susceptible.[4]
Management
[edit]Infected trees should be culled from the orchard. When pruning in infected orchards, tools must be vigorously bleached between cuts to prevent cross-contamination and the spread of infections. Heat does not kill the viroid.[4]
See also
[edit]References
[edit]- ^ "Citrus exocortis" (PDF). NSW Department of Primary industries. Retrieved 3 October 2011.
- ^ Mishra MD, Hammond RW, Owens RA, Smith DR, Diener TO (August 1991). "Indian bunchy top disease of tomato plants is caused by a distinct strain of citrus exocortis viroid". Journal of General Virology. 72 (8): 1781–5. doi:10.1099/0022-1317-72-8-1781. PMID 1875190.
- ^ Flores, R.; Randles, J. W.; Bar-Joseph, M.; Diener, T. O. (1998). "A proposed scheme for viroid classification and nomenclature". Archives of Virology. 143 (3). Springer: 623–629. doi:10.1007/s007050050318. ISSN 0304-8608. PMID 9572562. S2CID 27149859.
- ^ a b "Exocortis / Citrus / Agriculture: Pest Management Guidelines / UC Statewide IPM Program (UC IPM)". www2.ipm.ucanr.edu. Retrieved 2020-04-21.
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