Gram Pod Borer
Helicoverpa armigera
📖 Description
Gram Pod Borer (also called Cotton Bollworm or Tomato Fruit Borer) is one of the most polyphagous and destructive agricultural pests in the Indian subcontinent, attacking over 180 plant species. It causes annual losses exceeding $1 billion in India alone. Larvae feed on leaves, flowers, buds, pods, and fruits — boring inside pods of chickpea and pigeon pea, fruits of tomato and chilli, and bolls of cotton. The pest’s high reproductive rate, multiple generations per year, ability to migrate long distances, and rapid development of insecticide resistance make it exceptionally difficult to control. Integrated Pest Management (IPM) combining pheromone trapping, biological control with NPV, Bt, and Trichogramma, judicious chemical rotation, and resistant varieties is essential.
⚠️ Symptoms to watch for
- Round bore holes on pods and fruits, half-eaten fruits and pods, frass outside bore holes, defoliation of leaves, damage to growing points, complete pod damage in pulses, yield loss 30-100%
🩹 Treatment
- Install pheromone traps @ 8/ha for monitoring, release Trichogramma chilonis @ 50,000/ha, apply Bacillus thuringiensis @ 2g/L, use recommended insecticides at egg-laying stage, handpick larvae from tomato and pulses
🌿 Organic treatments
- Install pheromone traps @ 8/ha, release Trichogramma chilonis @ 50,000/ha weekly, spray Bacillus thuringiensis @ 2 g/L, apply NPV (Helicoverpa armigera Nuclear Polyhedrosis Virus) @ 250 LE/ha, spray neem oil 5 ml/L, handpick larvae, apply Metarhizium anisopliae
🧪 Chemical treatments
- Emamectin benzoate 5 SG @ 0.5 g/L, Chlorantraniliprole 18.5 SC @ 0.3 ml/L, Indoxacarb 14.5 SC @ 1 ml/L, Spinosad 45 SC @ 0.5 ml/L, Methomyl 40 SP @ 1 g/L (rotate; spray at egg-laying or early larval stage)
🛡️ Prevention
- Plant resistant varieties, use trap crops (marigold around chickpea), intercrop with onion or garlic, deep plough after harvest to expose pupae, handpick larvae, conserve predatory bugs and birds, avoid continuous solanaceous crops, harvest promptly at maturity, use light traps during moth activity
🪴 Affected plants
- Chickpea, Pigeon Pea, Cotton, Tomato, Maize, Sorghum, Sunflower, Groundnut, Chillies, Okra, Lentil, Many Vegetables (over 180 host plants)
🦋 Natural predators
- Trichogramma chilonis, Chrysoperla carnea, Reduviid Bugs, Spiders, Birds, NPV virus
🌱 Host plants
- Cicer arietinum, Cajanus cajan, Gossypium spp., Solanum lycopersicum, Capsicum annuum, Abelmoschus esculentum
🔄 Lifecycle
- Female lays 500-3000 eggs singly on tender leaves, buds, and fruits.
- Eggs hatch in 3-5 days.
- Larvae feed for 14-25 days, passing through 5-6 instars.
- Pupation occurs in soil, lasting 10-15 days.
- Adults live 7-15 days.
- Total life cycle 30-45 days; 4-7 generations per year.
📅 Season
- Year-round, peaks Oct-Dec on chickpea, Aug-Oct on cotton, Mar-Jun on tomato
🔎 Appearance
- Adults are medium-sized brownish moths with a characteristic kidney-shaped mark on forewings and a dark band on the lighter hindwings.
- Larvae are highly variable in color — green, brown, pink, or yellow — with white and dark stripes along the body, growing up to 40 mm.
💥 Damage level
- Severe
🔁 Reproduction rate
- Rapid
🗺️ Geographic regions
- Indian Subcontinent
- Africa
- Southeast Asia
- Australia
- Worldwide Tropics
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