Citrus psorosis virus Bark Scaling on Tarocco Sweet Orange

Plant Disease
M TessitoriA Catara

Abstract

Despite the wide distribution of vein flecking of citrus leaves in Italy, psorosis bark scaling has been reported only on Navelina sweet orange (Citrus sinensis L.), and Thompson and Washington navel oranges (1). Infection has not been found on any local sweet orange cultivars. Among these is Tarocco, a sweet orange cultivar that originated in Sicily, is very common because of the high fruit quality, has an attractive fruit appearance, and has blood-red pigmented flesh. In April 2001, classic psorosis bark scaling symptoms were observed on the main limbs of 10-year-old Tarocco trees grafted on sour orange rootstock, originally obtained by topworking Clementine (C. reticulata Blanco) trees with scions collected from 19-year-old Tarocco trees with no bark scaling at that time. The symptomatic trees first displayed one or two isolated circular patches of scales with gumming on the main or secondary limbs. As the disease progressed, the number of patches increased and coalesced to form bigger scales, resulting in bark flaking. Approximately 15% of trees in the field showed different stages of the disease. All of the affected trees showed vein flecking of young leaves. A leaf pattern was also present in a few plants without bark sym...Continue Reading

Citations

Nov 30, 2017·EFSA Journal·UNKNOWN EFSA Panel on Plant Health (PLH)Thierry Candresse

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