Sweet orange scab differs from common orange scab that’s widespread in Florida in that SOS only affects fruit, according to a University of Florida publication. Sweet orange scab mostly attacks all sweet orange and some tangerines cultivars.
Common orange scab, caused by the fungus Elsinoe fawcetti, infects both fruit and leaves. It is predominately a problem on many tangerine hybrids, such as temple, as well as grapefruit and lemon. It rarely is found on sweet oranges.
Several commercial fungicides are labeled for common orange scab control.