Rose Leaf Roller
Archips rosana
📖 Description
Rose Leaf Roller (Archips rosana) is a common pest of roses across the Indian subcontinent, particularly severe in the commercial rose-growing belts of Karnataka (Bengaluru, Doddaballapur), Maharashtra (Pune, Nashik), Tamil Nadu (Hosur, Krishnagiri) and West Bengal where India is a major producer of cut roses and loose flowers. The pest is particularly damaging because (a) the caterpillars roll and tie leaves with silk, creating a protective shelter where they feed safely on the leaves inside — contact insecticides cannot reach the caterpillars inside the roll, (b) infested shoots are deformed and produce fewer and smaller flower buds, directly reducing commercial value for cut-flower roses, (c) feeding wounds create entry points for Botrytis (grey mould) in humid conditions — a particularly damaging secondary pathogen for cut-flower roses in polyhouses, (d) the pest has multiple overlapping generations per year (6-8 in tropical India), allowing rapid buildup from undetectable to damaging levels, and (e) the pest overwinters as eggs laid on rose canes in temperate regions, allowing early-season infestations to establish from carryover populations. The pest is most severe in over-fertilized gardens with lush tender growth and in polyhouses (where natural enemies are absent and conditions favour rapid buildup). IPM with winter pruning to reduce carryover population, pheromone trap monitoring, weekly hand-picking of rolled leaves, Bt sprays during peak adult flight, Trichogramma egg parasitoid releases, and need-based insecticide rotation provides effective and sustainable control. For organic rose growers (a growing market segment in India for Ayurvedic rose petal products), the key strategies are conserving native predators, regular hand-picking, Bt sprays, and Trichogramma releases.
⚠️ Symptoms to watch for
- Leaves rolled and tied with silk at the tips or margins (most diagnostic symptom)
- chewed holes within the rolled leaves
- frass inside the rolls
- distorted and reduced shoot growth
- fewer and smaller flower buds on infested shoots
- secondary infection by Botrytis (grey mould) through feeding wounds in humid conditions
- yield loss 15-30% in commercial cut-flower rose production
- severe quality downgrading due to deformed shoots
🩹 Treatment
- Hand-pick and destroy rolled leaves containing caterpillars (very effective for small gardens)
- install pheromone traps @ 4/ha for adult monitoring
- spray neem oil 1% with sticker on rolled foliage
- apply Bacillus thuringiensis (Bt) @ 1 g/L (highly effective against caterpillars)
- use need-based insecticide when 5% of shoots are infested
- prune and burn severely infested shoots during winter
🌿 Organic treatments
- Hand-pick and destroy rolled leaves containing caterpillars (the single most effective organic control — do this weekly during peak infestation)
- install pheromone traps @ 4/ha for adult monitoring and mass trapping
- spray Bacillus thuringiensis (Bt) @ 1 g/L (highly effective against young caterpillars — spray on and inside the rolls)
- spray neem oil 1% + 5 g/L soap on rolled foliage
- apply Beauveria bassiana @ 5 g/L
- spray NSKE 5%
- release Trichogramma chilonis @ 50000/ha (egg parasitoid)
- conserve native predators (spiders, lacewings, predatory bugs, birds)
🧪 Chemical treatments
- Emamectin benzoate 5 SG @ 0.3 g/L (very effective against caterpillars and safe for natural enemies)
- Chlorantraniliprole 18.5 SC @ 0.3 ml/L
- Spinosad 45 SC @ 0.2 ml/L
- Novaluron 10 EC @ 1 ml/L
- Lambda-cyhalothrin 5 EC @ 0.5 ml/L (broad-spectrum, use as last resort)
- Azadirachtin 10000 ppm @ 2 ml/L — apply sprays in the evening when caterpillars emerge from rolls to feed
🛡️ Prevention
- Prune and burn infested shoots during winter (December-January) to reduce carryover population (overwintering eggs are laid on the bark)
- maintain garden sanitation by removing fallen leaves and debris (pupation sites)
- avoid excess nitrogen fertilization (lush tender growth favours egg-laying)
- install pheromone traps @ 4/ha from February onward for monitoring
- hand-pick and destroy rolled leaves weekly during peak infestation (Apr-Oct)
- release Trichogramma chilonis @ 50000/ha fortnightly during bearing season (egg parasitoid)
- use Bacillus thuringiensis (Bt) sprays as a preventive measure during periods of peak adult flight
- scout twice weekly during spring flush when rolls establish fastest
- conserve native predators and birds by avoiding broad-spectrum insecticides
🪴 Affected plants
- Roses (all types — Hybrid Tea, Floribunda, Miniature, Climbing, Old Garden)
- Occasionally Raspberry
- Blackberry
- Strawberry
🦋 Natural predators
- Trichogramma chilonis (egg parasitoid)
- Spiders (LYS, Salticid)
- Lacewing Larvae (Chrysoperla)
- Predatory Bugs (Reduviid, Anthocorid)
- Ladybird Beetles (against eggs and young larvae)
- Birds (Bulbul, Babbler, Warbler — important predators in gardens and orchards)
🌱 Host plants
- Rosa spp. (all types)
- Rubus spp. (occasionally)
- Fragaria spp. (occasionally)
🔄 Lifecycle
- Female lays 50-150 eggs in flat masses on the bark of rose canes (overwintering) or on tender leaves.
- Eggs hatch in 7-14 days (or after winter for overwintering eggs).
- Larvae feed for 20-35 days through 5-6 instars inside rolled leaves, then pupate in silken cocoons in rolled leaves or soil debris for 10-15 days.
- Adult lifespan 10-20 days.
- Total life cycle 35-60 days; 6-8 overlapping generations per year in tropical India.
📅 Season
- Year-round in tropical India, peaks Feb-Jun (spring-summer — most damaging) and Sep-Nov
🔎 Appearance
- Adult is a small bell-shaped moth with characteristic rest posture (wings held tent-like over body); forewings yellowish-brown to chestnut with darker oblique bands and a darker patch at the tip; hindwings pale grey.
- Larva is a slender, smooth, yellowish-green caterpillar with a dark brown to black head capsule and pale thoracic shield; found inside rolled leaves secured with silk.
- Pupa is dark brown, 8-12 mm long, inside a silken cocoon in rolled leaves or soil debris.
💥 Damage level
- Moderate
🔁 Reproduction rate
- Rapid
🗺️ Geographic regions
- Indian Subcontinent
- Cosmopolitan in Temperate and Subtropical Rose-Growing Regions Worldwide
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