Scab Disease of Citrus
Scab (Elsinoe fawcetti): The lesions in early stages appear on the underside of the leaves as small semi-translucent dots, which finally become sharply defined pustular elevations. In later stages, leaves often become distorted, wrinkled, stunted and deformed. On the fruit, lesions consist of corky projections, which often break into scabs. The opposite surface corresponding to the warty growth shows a circular depression with a pink to red center.
Control : The diseased leaves, twigs and fruits should be collected and destroyed. Spraying of Bordeaux mixture or Blitox (0.3%) is quite effective.