Apple Codling Moth
Cydia pomonella
📖 Description
Apple Codling Moth (Cydia pomonella) is the most destructive pest of apple worldwide and a major constraint to Indian apple production, particularly severe in apple belts of Himachal Pradesh (Shimla, Kullu, Kinnaur), Jammu & Kashmir (Srinagar, Baramulla, Anantnag), Uttarakhand (Chamoli, Nainital, Dehradun) and Arunachal Pradesh where apple is grown on over 300,000 hectares. The larva is the destructive stage — it bores into the apple fruit through the calyx or skin, feeds inside the fruit core around the seeds, and causes the characteristic ‘wormy apple’ that is unmarketable. A single larva can completely ruin an apple. The pest has 2-3 generations per year in the Indian apple belt, with first-generation larvae attacking young fruit in May-June and subsequent generations attacking maturing fruit through September. IPM with pheromone-based mating disruption (one of the most successful IPM stories worldwide), Bacillus thuringiensis applications against egg-hatch, removal and destruction of infested fruit, and tree banding to capture wandering larvae provides effective and sustainable control. The codling moth is particularly well-suited to mating disruption because (a) females mate only once, (b) males are attracted to female pheromone from long distances, and (c) pheromone dispensers can saturate the orchard atmosphere with synthetic pheromone, preventing males from finding females. CpGV (Cydia pomonella granulosis virus) is another highly specific and effective biological control agent — it kills only codling moth larvae and is safe for humans, beneficial insects and the environment.
⚠️ Symptoms to watch for
- Pinhole entry on fruit skin with frass (excrement) exuding, characteristic 'wormy' apple with larva feeding inside fruit core and around seeds, premature fruit drop, fruit downgrading and unmarketability, yield loss 30-80% in untreated orchards, complete crop loss in severe outbreaks
🩹 Treatment
- Install pheromone traps @ 4/ha for monitoring and mating disruption, spray Bacillus thuringiensis @ 1 g/L on young larvae at egg-hatch, apply need-based insecticide at 7-14 day intervals based on pheromone trap catches, remove and destroy infested fruit
🌿 Organic treatments
- Bacillus thuringiensis var. kurstaki @ 1-2 g/L at egg-hatch (7-10 day intervals), Cydia pomonella granulosis virus (CpGV) @ 0.5 ml/L (highly specific and effective), mating disruption dispensers @ 200-500/ha (Isomate-C), spray neem oil 5 ml/L, remove and destroy infested fruit regularly, install pheromone traps @ 4/ha for monitoring
🧪 Chemical treatments
- Chlorantraniliprole 18.5 SC @ 0.3 ml/L, Emamectin benzoate 5 SG @ 0.3 g/L, Spinosad 45 SC @ 0.2 ml/L, Thiacloprid 240 SC @ 0.5 ml/L, Indoxacarb 14.5 SC @ 0.5 ml/L, Novaluron 10 EC @ 1 ml/L — apply at egg-hatch based on pheromone trap catches
🛡️ Prevention
- Install pheromone traps @ 4/ha for monitoring and mating disruption (200-500 dispensers/ha), remove and destroy infested fruit regularly (twice weekly during fruit development), clean tree banding (corrugated cardboard bands around trunks to capture wandering larvae), destroy fruit bins and picking containers after harvest, plant resistant varieties (Red Delicious strains show some tolerance), quarantine new orchards
🪴 Affected plants
- Apple, Pear, Walnut, Quince, Apricot, Peach (rare), Other Pome Fruits
🦋 Natural predators
- Trichogramma spp. (egg parasitoid), Ascogaster quadridentata (egg-larval parasitoid), Mastrus ridibundus (larval parasitoid), Birds (woodpeckers), Spiders, Predatory Bugs
🌱 Host plants
- Malus domestica, Pyrus communis, Juglans regia, Cydonia oblonga, Prunus armeniaca
🔄 Lifecycle
- Female lays 30-70 eggs singly on leaves or fruit.
- Eggs hatch in 7-14 days.
- Larvae bore into fruit and feed for 20-30 days through 5 instars.
- Larvae exit fruit and pupate under bark or in soil in silken cocoon, lasting 14-25 days (overwintering larvae pupate in spring).
- Adult lifespan 7-14 days.
- Total life cycle 40-60 days (summer); one generation per year in cool regions, 2-3 generations in warmer apple belts.
📅 Season
- April-September (active season), peaks May-Jul (1st gen) and Aug-Sep (2nd gen) in apple belt
🔎 Appearance
- Adult is a small, greyish-brown moth with characteristic dark coppery-brown patch at the tip of each forewing and faint dark cross-lines.
- Larva is a pinkish-white caterpillar with a dark brown head capsule and a dark thoracic shield — distinctive 'pink worm' inside apple fruit.
- Pupates in silken cocoon under bark or in soil.
💥 Damage level
- Severe
🔁 Reproduction rate
- Moderate
🗺️ Geographic regions
- Indian Subcontinent (Hill Regions)
- Cosmopolitan in Apple-Growing Temperate Regions Worldwide
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