Arborist b 480-969-8808Sweet orange scab



Scientific Name

[Fungus] Elsinoe australis Bitancourt and Jenk.

Anamorph Sphaceloma australis Bitancourt and Jenk.

Disease cycle 

Sweet orange scab forms spores on the surface of the scab pustules. This species of scab attacks mainly fruits. The conidia (asexual spores) are similar to those of E. fawcettii, require moisture for spore production and are primarily spread by splashing rain. Fruits are susceptible for 6 to 8 weeks after petal fall. The role of ascospores (sexual spores) is uncertain.


Sweet orange scab does not usually form lesions on leaves or twigs in contrast to the more common Citrus scab.

Fruit- the rinds of young fruit display relatively large flat or warty outgrowths (windscar) which vary in color from a light pink to a grayish-brown with age. Sweet orange scab lesions are flatter than those produced by E. fawcettii (Citrus scab).

Host range 

Grapefruit, sweet orange, lemon, and tangerine cultivars.


Rio Grande Valley-Texas, Arizona, Florida, Brazil, Argentina, Bolivia, and Uruguay.

Easily confused with 

Citrus scab (Elsinoe fawcettii)


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