Widespread distribution. In tropical and temperate Asia, Oceania. An important pest.
Eggs are laid on the leaves and petioles. Mature caterpillars eat between veins, sometimes all the leaf.
Look for the horn and the large eye spots.
Outbreaks uncommon because of natural enemies, and other control measure not needed.
Natural enemies: parasitoid wasps.
Cultural control: visit garden regularly; handpick caterpillars; allow chickens into the taro fields.
Chemical control: not usually required. If needed, use PDPs: neem, pyrethrum, or chilli; use products from bacteria, e.g., spinosad or Bt (Bacillus thuringiensis) on young caterpillars. Alternatively, use synthetic pyrethroids, but likely to kill natural enemies.