Worldwide distribution. In Oceania. Australia (native), American Samoa, Cook Islands, Fiji, French Polynesia, Guam, Kiribati, New Caledonia, New Zealand, Palau, Tuvalu, Vanuatu. Preys on Icerya species.
Eggs, red, laid on or under scales. Larvae (greyish with black spots) feed on scale eggs (in eggsac), crawlers, larvae; adults red-brown, black behind the head, covered in short white hairs.
Biosecurity: Need to assess risk before introduction: Icerya may be food for native species, and non-target insects may be attacked by Rodolia, although host range is narrow.
Management: (i) avoid use of organophosphates, carbamates and synthetic pyrethroids; possible to use spinosad and abamectin if insecticides required to enhance control ; (ii) use sleeve cages to protect populations initially; control ants: (a) stomach poisons (fipronil, Amdro®, borax), (b) growth regulators (methoprene, pyriproxyfen), (c) nerve poisons (bifenthrin, fipronil, imidacloprid). See (http://piat.org.nz/getting-rid-of-ants).