Elsinoë australis, sweet orange scab, is a fungus that mainly attacks citrus fruits.
Signs and Symptoms
E. australis forms spores on the surface of the scab pustules. This species of scab attacks mainly fruits. The conidia require moisture for spore production. They are usually dispersed by splashing rain. Fruits remain susceptible to E. australis for 6 to 8 weeks after flowering finishes.
E. australis was spread to Rio Grande Valley-Texas, Arizona, Florida, Brazil, Argentina, Bolivia, and Uruguay.
Fungicides work best on E. australis when used prior to disease onset, but some will also a degree of disease control after the fruit has been infected. All regulations and directions for application of fungicides in your state should be followed.