Diseases - Citrus Australia

The disease also affects Rangpur lime, and Rough lemon rootstocks. Lemon scab is caused by the fungus Sphaceloma fawcettii var. scabiosa. Symptoms Citrus scab attacks the fruit, leaves and twigs, producing slightly raised, irregular scabby or wart-like outgrowths. At first these outgrowths are grey or pinkish, becoming darker with age.