Journal of Plant Pathology (2007) 89, p. S62 (Sorrentino et al.)

G. Sorrentino, S. Davino, M. Guardo, M. Davino and A. Caruso (2007)
Diffusion of two different isolates of Citrus tristeza virus in Sicily
Journal of Plant Pathology 89 (3, Suppl.), S62-S62
Poster Presentation at S.I.Pa.V XIV National Meeting - Perugia, Italy 19-21 Sept. 2007
Abstract: In the area where the first large outbreak of Citrus Tristeza Virus (CTV) occurred in the province of Catania (Sicily), a severe CTV isolate (CTV-DS2) was discovered in 2002. In the years that followed the area around the focus was monitored to determine the spreading of this isolate. Monitoring was carried out by DASELISA and DTBIA and characterization and sequencing by molecular analysis (SSCP) of the P20 and P23 genes. During monitoring a mild CTV-isolate (CTV-DS1) was detected in a small plot at the borders of the original focus. CTV-DS1 occurred in a small area, in 13-14-years old sweet oranges cv. Tarocco O.L. grafted on sour orange, bordering a plot with 100% CTV-infected trees of mandarin cv. Fortune grafted on sour orange. Field observation aimed at estimating the movement and rate of spread of both viral isolates and at identifying possible aereas of coexitance and interactions of these strains. The severe isolate present in the original focus showed a fast spreading inside the plots infected since 2002 and in the bordering groves, so as to enlarge considerably its distribution. By contrast, the mild isolate moved slowly, remaining practically restricted to the area in which it was originally found. At the borders of the two foci both isolates isolates occurred in some sweet orange cv. Navelina OL grafted on sour orange. These doubly infected trees declined rapidily and died.
Database assignments for author(s): Guido Sorrentino, Salvatore Walter Davino, Maria Guardo

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Citrus tristeza virus	Citrus (genus)	Italy