Citrus disease

Causal 
Pathogen(s)  

Scientific reference

SA and CFB context

Leaf Blotch

Virus

Guerri, Pina, Vives, Navarro. & Moreno (2004) Plant Dis. 88: 906.

Does not occur in South Africa; see also points 3 and 4.

Psorosis

Virus

Campiglia, Silviera & Salibe (1976) In: Proc. 7^th Conf. IOCV., IOCV, Riverside CA. E.C. Calavan (Ed).

Almost completely eradicated in South Africa in 1960s; no infected trees known at present.  CFB is free from psorosis disease; see also points 3 and 4.

Variegated chlorosis

Xylella fastidiosa

Li, Pria, Lacava, Qin & Hartung (2003) Phytopath.3: 953-958.

Not present in South Africa

Asiatic greening

“Candidatus Liberibacter asiaticus”

No scientific proof; Experimental findings showing possible seed transmissibility prompted USDA to issue a restriction on seed imports (25 January 2008).

Asiatic greening does not occur in South Africa.  African Greening as caused by “Ca. L. africanus”, which is endemic in certain areas in South Africa.  However, the CFB is free from greening disease; see also points 3 and 4.

Citrus Canker

Xanthomonas smithii ssp. citri

No scientific proof; seed can become contaminated when harvested from infected fruit

Does not occur in South Africa; see also points 3 and 4.