Journal of Plant Pathology (2002) 84, p. 186 (Malfitano et al.)
M. Malfitano, M. Barone, D. Alioto, N. Duran-Vila and A. Ragozzino (2002)
A preliminary survey of citrus viroids in Campania
Journal of Plant Pathology 84 (3), 186-186
IX Meeting, Italian Society for Plant Pathology
Abstract: Until today, five viroid species (CEVd, CVd-I, CVd-II, CVd-III, CVd-IV) have been identified in citrus. CEVd and CVd-II, a specific variant of HSVd, are respectively the causal agents of Exocortis and Cachexia, two economically important diseases of citrus susceptible species. Non pathogenic HSVd variants, CVd-I, CVd-III, CVd-IV do not appear associated to specific symptoms in commercial species and varieties. CVd-I and specially CVd-III cause reductions in size of trees grafted on Poncirus trifoliata (Duran-Vila, 2000. Monografia de la SEF n.2, 87-91.). Ninety-five sources of several citrus species and cultivars from different areas of Campania were collected during summer 2001 and evaluated for the presence and distribution of citrus viroids, by sequential polyacrylamide gel electrophoresis (sPAGE) and molecular hybridisation with specific probes. CEVd, CVd-II, CVd-III and CVd-IV were diagnosed and mixed infections were frequently detected. Highest infection rates were recorded for CVd-II and CVd-III (84.2 and 81.0%). Data collected revealed a wide distribution of viroids, independently of age, species and cultivars analysed. None of the examined trees were infected by CVd-I, indicating that this viroid may probably not be present in Italy (La Rosa et al., 1988. Proc. 6th Int. Citrus Congress, 903-907).Further investigations are necessary to establish association between viroid species and field symptomatology.
Database assignments for author(s): Maria Barone, Daniela Alioto, Núria Duran-Vila
Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Citrus viroid II | Citrus (genus) | Italy | ||
| Citrus dwarfing viroid | Citrus (genus) | Italy |
