Cabbage Looper

📖 Description

Cabbage Looper (Trichoplusia ni) is an important defoliator of cabbage and other brassica vegetables across the Indian subcontinent, particularly severe in cabbage and cauliflower belts of Himachal Pradesh, Jammu & Kashmir, Uttarakhand, West Bengal, Odisha, Karnataka and Tamil Nadu. The ‘looper’ gait (only two pairs of prolegs) is characteristic of the family Noctuidae (subfamily Plusiinae) — the larva moves by bringing its posterior prolegs forward to meet its thoracic legs, creating a ‘looping’ motion. Both larvae and adults are nocturnal — larvae hide in cabbage heads during the day and feed at night, while adults fly at dusk and are attracted to light. Beyond direct defoliation, fecal contamination renders cabbage heads unmarketable. Bt-based biopesticides provide excellent control when applied against early instars in the cool evening hours. The pest is highly polyphagous, attacking over 160 plant species across 36 families, and is also a major pest of cotton, soybean and tomato in some regions. Outbreaks are favoured by warm dry weather and excessive nitrogen. IPM with Bt applications, light trapping of adults, conservation of natural enemies (especially Trichogramma egg parasitoids and coccinellid predators) and need-based insecticide use provides effective and sustainable control.