Bondi Junction NSW, Australia
Fact Sheets
Yellow-shelled semi-slug (403)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Restricted. Asia, North America (Hawaii), Oceania. In Fiji.
  • An invasive species, attacking vegetables and fallen fruit. Pale grey to dark brown, up to 45 mm long, plate-like shell, covered or partly covered by mantle, white line along edge of keel (rear end), and larger of the two pairs of tentacles dark-brown to black. Spread with produce, soil, machinery. Spreads rat lung worm to humans.
  • Natural enemies: predatory snails and flatworms, but they should NOT be introduced without environmental impact studies. These generalists will annihilate local snails. Use Indian runner ducks (but note, slug climbs trees and buildings).
  • Biosecurity: intercepted on vegetables.
  • Cultural control: bare earth or sand around plots; collect and destroy; use beer traps to attract slugs.
  • Chemical control: note, metaldehyde NOT recommended: toxic to livestock, pets and humans; use baits with iron phosphate, sodium ferric EDTA - effective and safer.

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