Citrus exocortis viroid
Virus classification Edit this classification
(unranked): Virus
Family: Pospiviroidae
Genus: Pospiviroid
Species:
Citrus exocortis viroid

Citrus exocortis is a disease of citrus plants, caused by the Citrus exocortis viroid (CEVd). 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

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

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

References

  1. ^ "Citrus exocortis" (PDF). NSW Department of Primary industries. Retrieved 3 October 2011.
  2. ^ 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.
  3. ^ Flores, R.; Randles, J. W.; Bar-Joseph, M.; Diener, T. O. (1998). "A proposed scheme for viroid classification and nomenclature". Archives of Virology. Springer. 143 (3): 623–629. doi:10.1007/s007050050318. ISSN 0304-8608. PMID 9572562. S2CID 27149859.
  4. ^ 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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