Groundnut Thrips (Peanut Thrips)
Scirtothrips dorsalis
📖 Description
Groundnut Thrips (Scirtothrips dorsalis), also called Chilli Thrips in some classifications, is an important pest of groundnut, chilli, citrus and tea across the Indian subcontinent, particularly severe in groundnut belts of Gujarat, Andhra Pradesh, Telangana, Tamil Nadu, Karnataka, Maharashtra and Rajasthan where groundnut is grown on over 5 million hectares. The pest is particularly damaging because (a) it feeds on tender growth, flowers and developing pods, causing direct physical damage (silvering, scarring, deformation), (b) it transmits devastating orthotospoviruses including Groundnut Bud Necrosis Virus (GBNV) — the most important viral disease of groundnut in India causing annual losses exceeding ₹500 crore, (c) it has a very short life cycle (12-15 days) allowing rapid population buildup, and (d) it has developed resistance to many insecticides. The pest is particularly difficult to control because (a) it hides in growing points, leaf curls and flower buds where contact insecticides don’t reach, (b) it has a wide host range allowing populations to persist between cropping cycles, and (c) it is tiny and often not detected until damage is severe. IPM with blue sticky trap monitoring, biological control (Amblyseius swirskii predatory mite is highly effective), neem-based sprays, and need-based insecticide rotation provides effective and sustainable control. The pest is most severe in continuous groundnut cropping and in areas with high weed pressure. Planting resistant varieties (ICGV series developed by ICAR) and roguing virus-infected plants immediately are key preventive measures.
⚠️ Symptoms to watch for
- Silvering and bronzing of tender leaves from feeding, distorted and crinkled leaves, scarred and deformed pods, transmission of Groundnut Bud Necrosis Virus (GBNV), Capsicum Chlorosis Virus (CaCV), Peanut Yellow Spot Virus (PYSV), yield loss 20-50% in virus-affected crops, reduced pod quality from scarring
🩹 Treatment
- Install blue sticky traps @ 20/ha for monitoring, apply neem oil 1% with sticker, release Amblyseius swirskii @ 50000/ha (predatory mite), use need-based systemic insecticide at first sign, rogue virus-infected plants immediately
🌿 Organic treatments
- Install blue sticky traps @ 20/ha for monitoring and mass trapping, release Amblyseius swirskii @ 50000/ha (predatory mite — very effective against thrips), spray neem oil 1% + 5 g/L soap on tender growth, apply Verticillium lecanii @ 5 g/L, spray NSKE 5%, conserve native predatory thrips and bugs (Orius)
🧪 Chemical treatments
- Spiromesifen 240 SC @ 0.5 ml/L, Fipronil 5 SC @ 1 ml/L, Imidacloprid 17.8 SL @ 0.3 ml/L, Acetamiprid 20 SP @ 0.2 g/L, Spinosad 45 SC @ 0.2 ml/L, Emamectin benzoate 5 SG @ 0.3 g/L — rotate to avoid resistance
🛡️ Prevention
- Plant virus-free seed, rogue virus-infected plants immediately, destroy weed hosts (Cassia, Croton, Euphorbia, Ageratum) around fields, plant early to escape peak thrips buildup, use blue sticky traps @ 20/ha for monitoring, plant resistant varieties (ICGV 86031, ICGV 86699), avoid excess nitrogen, conserve native predatory thrips and bugs by avoiding broad-spectrum insecticides
🪴 Affected plants
- Groundnut, Peanut, Chilli, Capsicum, Citrus, Tea, Cotton, Mango, Castor, Cucurbits, Numerous Ornamentals and Weeds
🦋 Natural predators
- Amblyseius swirskii (predatory mite — highly effective), Scolothrips sexmaculatus (predatory thrips), Orius spp. (anthocorid bug), Spiders, Ladybird Beetles
🌱 Host plants
- Arachis hypogaea, Capsicum annuum, Citrus spp., Camellia sinensis, Gossypium hirsutum, Mangifera indica
🔄 Lifecycle
- Female lays 50-200 eggs inserted in tender plant tissue.
- Eggs hatch in 3-5 days.
- Nymphs feed for 5-8 days through 2 instars.
- Pre-pupa and pupa stages in soil or leaf litter, lasting 3-5 days.
- Adult lifespan 15-25 days.
- Total life cycle 12-18 days at 25-30°C; 15-20 overlapping generations per year.
📅 Season
- Year-round in tropical India, peaks Jun-Sep (kharif groundnut) and Jan-Apr (rabi/summer groundnut)
🔎 Appearance
- Adult is a tiny, slender, pale yellowish-orange thrips with fringed wings; body is elongate and somewhat flattened.
- Nymphs are pale yellowish-white, smaller and wingless.
- Thrips hide in growing points, leaf curls and flower buds, making detection difficult without careful inspection of tender growth.
💥 Damage level
- Moderate
🔁 Reproduction rate
- Very Rapid
🗺️ Geographic regions
- Indian Subcontinent
- South Asia
- Southeast Asia
- East Asia
- Pacific (Invasive in Americas)
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