Feeding damage takes the form of patches or holes on the leaves. The caterpillars prefer young leaves as their food source. The Caterpillar has the appearance of bird poop with creamy white markings and it produces a foul odour. The adults feed on the nectar of flowers.
Damage is caused by the feeding of the Giant Swallowtail caterpillar. Female adults lay their eggs individually on the upper surface of the leaves of host plants. Eggs are usually small, spherical and cream to brown in colour. The caterpillars can resemble bird droppings and are dark brown with creamy white markings around the mid-body. The adult butterfly is very large, which has dark brown wings with yellow markings, including a large horizontal yellow strip across the wings. They are usually between 4 to 6 inches in size.
Introduce parasitic insects such as Lespecia rileyi (Williston), Brachymeria robusta, Pteromalus Cassotis Walker and Pteromalus vanessae Howard. Protect nursery stock and young grove trees with Bacillus thuringiensis. Spray leaves with soapy water. Mature citrus trees can easily withstand the loss of a few leaves.
Always consider an integrated approach with preventive measures together with biological treatments, if available. Mature commercial citrus trees can withstand larvae infestation, hence there is little or no need for chemical control methods.