- Widespread distribution. Asia, Africa, Oceania. On members of the brassica family - broccoli, cabbage, cauliflower, Chinese cabbage, mustard and radish.
- Egg masses yellow. Young larvae feed together often on the 'head'. Larger larvae with long hairs, yellow lines along the back and brown heads.
- Larvae feed under silk webbing at the plant centre.
- Cultural control: inspect nurseries and crops frequently: remove egg masses and/or larvae; plant far from old crops; trap crops, e.g., mustards or Chinese cabbage (Bok Choy), but destroy trap crop before insects hatch.
- Chemical control: in household plots, PDPs to safeguard natural enemies (chillies, neem, derris, pyrethrum); in commercial plots, grow under nets; use Bt (Bacillus thuringiensis) sprays against caterpillars when young.