Pacific Pests, Pathogens and Weeds - Online edition

Pacific Pests, Pathogens, Weeds & Pesticides

Cryptolaemus montrouzieri (395)

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  • Worldwide distribution. The 'mealybug destroyer'. In Oceania, Australia (native), Cook Islands, Fiji, Guam, New Caledonia, New Zealand, Papua New Guinea. Available commercially. Preys on scales, mealybugs and aphids.
  • Eggs laid near prey, larvae with yellowish grey bodies and waxy threads, orange-brown heads and black wing cases. Covered in fine white hairs.
  • Important biocontrol beetle.
  • Natural enemies: wasps, spiders, birds, and ants.
  • Biosecurity: need to assess risk before introduction as it is a generalist.
  • Cultural control: hot water to kill ants: 47°C (note, 49°C kills plants).
  • Management: (i) move adults and larvae to colonies of pests; (ii) use sleeve cages to protect populations initially; (iii) avoid use of organophosphates, carbamates and synthetic pyrethroids; (iv) control ants: (a) stomach poisons (fipronil, Amdro®, borax), (b) growth regulators (methoprene, pyriproxyfen), (c) nerve poisons (bifenthrin, fipronil, imidacloprid). See (
Common Name

Mealybug ladybird, also known by the nickname 'mealybug destroyer'. In Oceania, Australia, Cook Islands, Fiji, Guam, New Caledonia, Papua New Guinea.

Scientific Name

Cryptolaemus montrouzieri

AUTHOR Grahame Jackson & Mani Mua
Information from Swaine G (1971) Agricultural Zoology in Fiji. Her Majesty's Stationery Office. London; and Martin NA (2018) Mealybug ladybird - Cryptolaemus montrouzieri. New Zealand Arthropod Factsheet Series No. 50. (; and Cryptolaemus montrouzieri. Wikipedia. (; and Cryptoleamus montrouzieri (mealybug destroyer) (2019) CABI Invasive Species Compendium. (; and from Pacific Invasive Ant Toolkit. ( Photo 1 Sonya Broughton, Department of Agriculture & Food Western Australia, Photo 2 David Cappaert, Photo 4 Randy Thaman, University of the South Pacific, Fiji.

Produced with support from the Australian Centre for International Agricultural Research under project HORT/2016/18: Responding to emerging pest and disease threats to horticulture in the Pacific islands, implemented by the University of Queensland and the Pacific Community.

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