Worldwide distribution. There are two types, brown and black; but a microscope is needed to tell them apart. The brown citrus aphid occurs on citrus, and perhaps close relatives. The black citrus aphid occurs on over 120 hosts, including citrus, cocoa, coffee, Hibiscus, maize, Vanda orchids and tea. Important pests.
Important: (i) suck sap damaging shoot tips; (ii) spread Citrus tristeza virus; (iii) produce honeydew, blackening leaves.
Citrus tristeza virus is spread more efficiently by the black type.
Most colonies are wingless; winged adults develop when colonies are large. The aphids can fly up to 30 km.
Natural enemies: predators, and parasitoid wasps.
Chemical control: white or horticultural oils; PDPs: neem, derris, pyrethrum, or chilli; or synthetic pyrethroids, but likely to kill natural enemies.