Pomegranate Butterfly
Deudorix epijarbas
📖 Description
The Pomegranate Butterfly (Deudorix epijarbas), also called the Pomegranate Fruit Borer, is the single most destructive insect pest of pomegranate in India — a country that produces 1.7 million tonnes of pomegranate annually (Maharashtra alone accounts for ~70 %). The larva is a classic internal borer: after hatching on the fruit surface, it bores through the calyx or stalk end and feeds internally on the arils (the edible seed pulp), causing the fruit to rot from the inside out. The damage is largely invisible from the exterior — only the bore hole and a small plug of frass betray the infestation — which means even experienced growers cannot cull all infested fruits during harvest grading. As a result, infested fruits often reach the market and burst during transport, contaminating the entire consignment. The pest is most severe during the monsoon ‘Mrig bahar’ crop (June–September harvest) when humidity favours oviposition and larval survival; many growers in Maharashtra have abandoned the Mrig crop entirely in favour of the drier ‘Ambe bahar’ (spring flowering, summer harvest) specifically to escape this pest. The export-oriented Pomegranate Aril Processing Industry of Maharashtra and Andhra Pradesh, supplying the Middle East and Europe with packaged ready-to-eat arils, considers D. epijarbas the most critical insect quarantine pest for export consignments.
⚠️ Symptoms to watch for
- Bore hole at the calyx end or stalk end of the fruit
- frass and excreta sticking out of the bore hole as a webby mass
- fruit turns yellow, softens, and rots prematurely
- 'rotten-egg' odour when the fruit is cut open due to bacterial decay following larval entry.
- Infested fruits become unfit for fresh market or processing — India's Maharashtra pomegranate belt (Solapur, Sangli, Pune) routinely loses 20–60 % of the crop annually, with peak losses exceeding 80 % in unsprayed orchards during the 'Mrig bahar' (June–September) crop.
🩹 Treatment
- Cultural: bag the fruit in 200-gauge perforated polyethylene or paper bags immediately after fruit set — the single most effective control.
- Mechanical: collect and destroy fallen and infested fruits daily to prevent larvae from completing development in the soil.
- Chemical: spray dimethoate 30 EC at 0.06 % or lambda-cyhalothrin 5 EC at 0.5 ml/L at full bloom, petal-fall, and at 15-day intervals until 30 days before harvest
- apply neem oil 5 % emulsion between chemical sprays to reduce insecticide load.
🌿 Organic treatments
- Fruit bagging with butter paper or non-woven fabric bags (the single most effective organic practice)
- spraying neem oil (Azadirachta indica) at 5 % emulsion weekly during flowering and fruit-set
- application of Bacillus thuringiensis var. kurstaki at 1 kg/ha at 7-day intervals
- installation of pheromone-free light traps to reduce adult activity
- mass-trapping adults using fruit-bait traps (rotting banana + molasses + yeast).
🧪 Chemical treatments
- Lambda-cyhalothrin 5 EC @ 0.5 ml/L, Dimethoate 30 EC @ 1.5 ml/L, Emamectin benzoate 5 SG @ 0.4 g/L, Thiamethoxam 25 WG @ 0.4 g/L, Chlorantraniliprole 18.5 SC @ 0.3 ml/L.
- Pre-harvest interval 21–30 days
- rotate insecticide groups to delay resistance.
🛡️ Prevention
- Adopt fruit bagging as a routine practice in commercial orchards
- remove and destroy all fallen fruits weekly
- prune the tree to open the canopy — adults prefer dense shade for oviposition
- avoid 'Mrig bahar' (monsoon crop) in heavily infested blocks and shift to 'Ambe bahar' (spring crop) which has lower pest pressure
- plant windbreaks of tall grasses or Sesbania to reduce adult migration
- treat soil around the basin with Metarhizium anisopliae to kill pupating larvae.
🪴 Affected plants
- Pomegranate (Punica granatum) — primary host
- occasionally on Punica protopunica (wild pomegranate), Zyziphus mauritiana (Indian jujube), and Annona squamosa (custard apple).
🦋 Natural predators
- Trichogramma chilonis (egg parasitoid — 30–50 % natural parasitism in unsprayed orchards)
- Telenomus sp.
- Apanteles sp. (larval braconid parasitoid)
- Brachymeria sp. (pupal parasitoid)
- predatory ants (Oecophylla smaragdina, Camponotus compressus)
- spiders
- and insectivorous birds (drongos, bulbuls).
🌱 Host plants
- Punica granatum (primary host)
- Punica protopunica
- Zyziphus mauritiana
- Annona squamosa
- Aegle marmelos (occasionally).
🔄 Lifecycle
- Adult female lays 50–150 pale yellow, flattened, dome-shaped eggs singly on the fruit calyx, stalk, or young leaves adjacent to fruit.
- Egg stage 4–7 days.
- Larva bores into the fruit within hours of hatching and develops through 4–5 instars over 18–28 days, feeding entirely inside the fruit.
- Full-grown larva exits the fruit, drops to the soil, and pupates in leaf litter or under stones at 1–3 cm depth; pupal stage 12–18 days.
- Adult longevity 7–15 days.
- Total lifecycle 35–55 days; 4–6 overlapping generations per year.
📅 Season
- Active throughout the year in tropical pomegranate-growing tracts.
- Peak infestation during the 'Mrig bahar' crop (June–September) when monsoon humidity supports high adult activity and larval survival; lowest pressure during the dry 'Ambe bahar' (February–May harvest).
🔎 Appearance
- Adult is a colourful lycaenid butterfly — male has bright orange-red upper wings with a dark brown border, female is duller brown; hindwing bears a small tail-like extension with a black-and-orange eyespot at the base.
- Larva is a stout, dull brownish-yellow caterpillar with a dark brown head, a flattened woodlouse-shaped body, and dense short pubescence — typical of lycaenid larvae.
- The larva is the damaging stage, boring inside developing pomegranate fruits.
💥 Damage level
- Severe
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- Indian Subcontinent (Maharashtra, Karnataka, Andhra Pradesh, Gujarat, Tamil Nadu, Rajasthan)
- South Asia (Sri Lanka, Pakistan, Bangladesh)
- Southeast Asia (Myanmar, Thailand, Indonesia, Philippines)
- Australia
- southern China.
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