Sesame Leaf Roller
Antigastra catalaunalis
📖 Description
Sesame Leaf Roller is the most destructive pest of sesame across the Indian subcontinent, particularly severe in Gujarat, Rajasthan, Madhya Pradesh, Uttar Pradesh, Andhra Pradesh and Tamil Nadu where sesame is grown on over 2 million hectares. The pest attacks all stages of the crop — leaves, flowers and capsules — making it the single biggest constraint to sesame production in India. The larva rolls leaves with silk and feeds within the roll, protecting itself from natural enemies and insecticide contact. Beyond direct defoliation, flower and capsule feeding directly reduces seed yield. Outbreaks are favoured by warm humid weather during flowering and capsule formation. IPM with Bt applications against early instars, light trapping of adults, hand-collection of rolled leaves and need-based insecticide at flowering provides effective control. The pest is a major reason why Indian sesame yields (300-400 kg/ha) are below the world average — improved IPM adoption is critical for unlocking yield potential.
⚠️ Symptoms to watch for
- Initial webbing of tender leaves by young larvae, leaf folding and rolling with silk, window-pane feeding within rolls, feeding on flowers and young capsules, capsule drop, reduced seed set, yield loss 30-60% in untreated fields, complete crop failure in severe outbreaks
🩹 Treatment
- Handpick rolled leaves and destroy, install light traps @ 1/ha, spray NSKE 5% in early evening, apply Bacillus thuringiensis @ 1 g/L on young larvae, use need-based insecticide when 5 rolled leaves per plant
🌿 Organic treatments
- Bacillus thuringiensis var. kurstaki @ 1-2 g/L, NSKE 5%, neem oil 5 ml/L, Beauveria bassiana @ 5 g/L, hand-collect and destroy rolled leaves, set up light traps, spray NPV (Antigastra NPV) @ 250 LE/ha if available
🧪 Chemical treatments
- Emamectin benzoate 5 SG @ 0.3 g/L, Chlorantraniliprole 18.5 SC @ 0.3 ml/L, Novaluron 10 EC @ 1 ml/L, Quinalphos 25 EC @ 1.5 ml/L, Indoxacarb 14.5 SC @ 0.5 ml/L — apply at flowering initiation
🛡️ Prevention
- Plant early to escape peak larval period, intercrop with redgram or mungbean to disrupt oviposition, destroy crop residues after harvest, deep summer ploughing to expose pupae, install light traps at onset of monsoon, plant resistant varieties (RT-346, TKG-22)
🪴 Affected plants
- Sesame, Sesamum indicum (Primary), Wild Sesame, Some Pedaliaceae
🦋 Natural predators
- Trichogramma spp., Telenomus spp., Spiders, Robber Flies, Predatory Bugs, Birds
🌱 Host plants
- Sesamum indicum, Sesamum radiatum, Ceratotheca sesamoides
🔄 Lifecycle
- Female lays 100-250 eggs singly on tender leaves and flower buds.
- Eggs hatch in 3-5 days.
- Larvae feed for 12-20 days through 5 instars, webbing leaves together.
- Pupation inside rolled leaves or in soil, lasting 7-12 days.
- Adult lifespan 7-12 days.
- Total life cycle 25-40 days; 5-7 generations per year.
📅 Season
- July-October (kharif sesame), peaks Aug-Sep
🔎 Appearance
- Larva is a small, slender caterpillar with a translucent pinkish-green body, brown head capsule and short fine hairs.
- Young larvae are pale yellow.
- Adult moth is small (12-15 mm wingspan), dark brownish with pale yellowish markings and fringed wings.
- Rests with wings folded tent-like over body.
💥 Damage level
- Severe
🔁 Reproduction rate
- Rapid
🗺️ Geographic regions
- Indian Subcontinent
- South Asia
- Africa
- Tropics Worldwide
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