Bondi Junction NSW, Australia
Fact Sheets
Beet webworm (345)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Worldwide. Defoliation by caterpillars important on beet, amaranth, and legumes - if attack coincides with pod-filling.
  • Larvae feed from underside of leaves, making 'windows'; later, feed from within rolled leaves. Up to 25 mm, greyish-green (reddish-pink at maturity), with dark line along back. Adult with white bands on wings.
  • Spreads on the wing: famous for long-distance migrations; spread in plant trade.
  • Natural enemies: larval parasitoids.
  • Cultural control: weed; plant far from infested crops; in small plots, remove leaves with caterpillars, or squash by hand; collect debris and destroy after harvest.
  • Chemical control: PDPs (neem, derris, pyrethrum, or chilli, with soap to get them into rolled leaves); use spinosad or Bt (Bacillus thuringiensis). Avoid, synthetic pyrethroids: they will kill natural enemies.

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