Tobacco Caterpillar
Spodoptera litura
📖 Description
Tobacco Caterpillar (also called Cluster Caterpillar or Armyworm) is a major polyphagous pest across the Indian subcontinent and tropical Asia, attacking over 120 plant species. Female moths lay egg masses of 200-500 eggs covered with brown scales on the underside of leaves. Young larvae feed gregariously, skeletonizing leaves; older larvae disperse and become solitary, eating entire leaves, boring into fruits and pods, and causing complete defoliation. Outbreaks are common on soybean, groundnut, tobacco, cotton, and vegetables, particularly during warm humid periods. The pest has developed resistance to many insecticides, making NPV-based biological control a cornerstone of management.
⚠️ Symptoms to watch for
- Skeletonized leaves from gregarious feeding by young larvae, defoliation by older larvae, holes in fruits and pods, cut stems, frass on leaves, complete defoliation in severe infestation, yield loss 30-70%
🩹 Treatment
- Install pheromone traps @ 8/ha for monitoring and mass trapping, handpick egg masses and gregarious larvae, apply NPV (Spodoptera litura) @ 250 LE/ha, use Bacillus thuringiensis @ 2g/L, apply recommended insecticides at egg-laying stage
🌿 Organic treatments
- Install pheromone traps @ 8/ha, handpick egg masses and gregarious young larvae, apply Spodoptera litura NPV @ 250 LE/ha in evening, spray Bacillus thuringiensis @ 2 g/L, apply neem oil 5 ml/L, release Chrysoperla carnea @ 5000/ha, 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 modes of action)
🛡️ Prevention
- Install pheromone traps early, handpick egg masses, deep plough after harvest to expose pupae, plant trap crops, intercrop with onion or garlic, avoid excessive nitrogen, conserve predatory bugs and birds, use light traps during moth flights, monitor crops twice weekly for egg masses
🪴 Affected plants
- Tobacco, Cotton, Soybean, Groundnut, Castor, Sunflower, Cabbage, Cauliflower, Maize, Many Vegetables and Ornamentals (over 120 host plants)
🦋 Natural predators
- Chrysoperla carnea, Reduviid Bugs, Spiders, Birds, NPV virus, Trichogramma Wasps
🌱 Host plants
- Nicotiana tabacum, Glycine max, Arachis hypogaea, Ricinus communis, Gossypium spp., Brassica oleracea
🔄 Lifecycle
- Female lays 1000-2500 eggs in masses covered with brown scales.
- Eggs hatch in 3-5 days.
- Larvae feed for 14-25 days, passing through 6 instars.
- Pupation occurs in soil, lasting 7-12 days.
- Adults live 7-15 days.
- Total life cycle 25-40 days; 5-8 generations per year.
📅 Season
- Year-round, peaks Aug-Nov during monsoon-post-monsoon period
🔎 Appearance
- Adults are brownish moths with distinctive wavy white stripes on forewings.
- Larvae are dark brown to black with yellowish longitudinal stripes and pairs of dark triangular spots on each segment, growing up to 45 mm.
- Young larvae feed in groups (gregarious).
💥 Damage level
- Severe
🔁 Reproduction rate
- Rapid
🗺️ Geographic regions
- Indian Subcontinent
- Southeast Asia
- East Asia
- Pacific Islands
Have an Insect to Identify?
Upload or take a photo of an insect on your plant and our AI will identify it and recommend treatments.
📷 Diagnose from Image