Bondi Junction NSW, Australia
Fact Sheets
Yellow crazy ant (364)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Worldwide distribution. Common in Pacific island countries. Favours disturbed agriculture, forest areas, houses. Characteristic long antennae and quick jerky movements. Does not sting; sprays formic acid. Among world's 100 worse invasive species.
  • Nests on ground or in trees; forms super-colonies (10-150ha), up to 20 million workers/ha. A scavenger. Eats seeds, other insects, molluscs, smaller vertebrates, and honeydew. Forages day and night.
  • Direct damage: vegetable seeds; loss of biodiversity; indirectly by defending aphids, mealybugs, scales and whiteflies from natural enemies.
  • Tramp ant. Spread by 'budding' - queens and workers leave the colony; spread via international trade.
  • Biosecurity: requires risk assessments, regulations preventing introduction, protocols in case of breaches, and ability to make rapid response. Pacific Ant Prevention Plan available (IUCN/SSC Invasive Specialist Group).
  • Cultural control: hot water at 47°C kills ants; over 49°C kills plants.
  • Chemical control: use (i) stomach poisons (fipronil, Amdro®, borax), (ii) growth regulators (methoprene, pyriproxyfen), (iii) nerve poisons (bifenthrin, fipronil, imidacloprid). See (

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