Chilli Thrips (Indian Population)
Scirtothrips dorsalis
📖 Description
Chilli Thrips (also called Yellow Tea Thrips) is a major polyphagous pest across the Indian subcontinent, attacking over 100 plant species including chilli, cotton, tea, groundnut, and many ornamentals. Both adults and larvae feed by rasping plant tissue and sucking out cell contents, causing characteristic upward leaf curling, brown scabby patches on leaves and fruits, and flower drop. The pest is particularly damaging to chilli, where heavy infestation can render entire crops unmarketable. Chilli thrips also transmit chilli leaf curl virus and other viral diseases. The pest’s tiny size, hidden feeding in flowers and curled leaves, and rapid development of insecticide resistance make integrated management with sticky traps, biological control, and judicious chemical rotation essential.
⚠️ Symptoms to watch for
- Upward curling of leaves, brown scabby patches on leaves and fruits, distorted and discolored fruits, silvery feeding scars on leaves, flower drop, stunted plants, reduced market quality, transmission of chilli leaf curl virus
🩹 Treatment
- Install blue sticky traps @ 10/ha, apply neem oil 5ml/L with sticker, release predatory mites, use recommended insecticides at early infestation, conserve predatory bugs
🌿 Organic treatments
- Install blue sticky traps @ 10/ha, apply neem oil 5 ml/L with sticker, release predatory mites (Amblyseius spp.), apply Lecanicillium lecanii @ 5 g/L, spray 5% NSKE, intercrop with marigold or coriander, conserve predatory bugs by avoiding broad-spectrum insecticides
🧪 Chemical treatments
- Spinosad 45 SC @ 0.5 ml/L, Abamectin 1.9 EC @ 0.5 ml/L, Imidacloprid 17.8 SL @ 0.3 ml/L, Fipronil 5 SC @ 1 ml/L, Emamectin benzoate 5 SG @ 0.5 g/L (rotate; resistance common)
🛡️ Prevention
- Install blue sticky traps early, inspect tender growth weekly, use resistant varieties where available, intercrop with marigold or coriander, control weeds, avoid excessive nitrogen, conserve predatory mites and bugs, practice crop rotation, remove and destroy infested plant parts
🪴 Affected plants
- Chilli, Capsicum, Cotton, Groundnut, Tea, Rose, Mango, Citrus, Many Vegetables and Ornamentals (over 100 host plants)
🦋 Natural predators
- Amblyseius spp., Predatory Thrips, Minute Pirate Bugs, Green Lacewings, Spiders
🌱 Host plants
- Capsicum annuum, Gossypium spp., Camellia sinensis, Rosa spp., Arachis hypogaea, Mangifera indica
🔄 Lifecycle
- Female lays 60-200 eggs inside tender plant tissue.
- Eggs hatch in 5-8 days.
- Larvae feed for 5-10 days, passing through 2 instars.
- Pre-pupae and pupae develop in soil or leaf litter for 3-5 days.
- Adults live 20-30 days.
- Total life cycle 13-25 days; 10-15 overlapping generations per year in tropical conditions.
📅 Season
- Year-round in tropical climates, peaks Mar-Jun and Sep-Nov during warm dry periods
🔎 Appearance
- Tiny, slender, yellowish-orange thrips with fringed wings.
- Adults jump quickly when disturbed.
- Larvae are paler and wingless.
- They feed in groups on tender leaves, flowers, and fruits of chilli and other crops.
💥 Damage level
- High
🔁 Reproduction rate
- Rapid
🗺️ Geographic regions
- Indian Subcontinent
- Southeast Asia
- East Asia
- Africa
- Caribbean
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