Pumpkin Beetle
Aulacophora foveicollis
📖 Description
Aulacophora foveicollis, the red pumpkin beetle, is the most destructive foliage-feeding chrysomelid pest of cucurbits in India. Three Aulacophora species occur in India (A. foveicollis, A. lewisii, A. intermedia) but A. foveicollis is dominant in the plains. The species has 5–8 overlapping generations per year in tropical India. Adults emerge from soil at the onset of the monsoon and fly to cucurbit seedlings, where they feed on cotyledons, leaves, and flowers; larvae feed on rootlets and below-ground stems for 12–18 days before pupating in the soil. Because the beetle attacks at the most vulnerable seedling stage, unprotected early-sown cucurbit crops can suffer total crop loss within 3–5 days of emergence. The species is also a vector of squash leaf curl virus in some cucurbit systems, though this is less documented in India. Management is best achieved through seed treatment with systemic neonicotinoids plus foliar sprays timed to adult activity peaks.
⚠️ Symptoms to watch for
- Circular or irregular holes on cucurbit leaves and flowers caused by adult feeding, ring-barking of seedling stems that cause wilting and death, scarred and deformed young fruits, and rootlet damage by larvae that stunts plant growth.
- Heavy adult infestations can defoliate seedlings within 2–3 days of emergence, requiring re-sowing.
- Yield losses of 30–60 % are common in unprotected early-sown cucurbit crops.
🩹 Treatment
- Dust seedlings with ash or malathion 5 D at the cotyledon stage to deter adult feeding.
- Apply neem oil 2 % or azadirachtin 1 % (2 ml/L) on foliage at the first sign of adult activity.
- If infestations exceed 5 beetles per plant on young seedlings, apply malathion 50 EC @ 1.5 ml/L or lambda-cyhalothrin 5 EC @ 0.5 ml/L in the evening when adults are most active.
- Practice seed treatment with imidacloprid 600 FS @ 5 mL/kg seed for systemic protection during the first 3 weeks.
🌿 Organic treatments
- Ash dusting on seedlings at cotyledon stage
- neem oil 2 %
- azadirachtin 1 % (2 ml/L)
- Beauveria bassiana 1×10^8 cfu/mL @ 5 g/L
- collection and destruction of adult beetles in the early morning when they are sluggish
- use of yellow sticky traps @ 20/ha
- trap cropping with bitter gourd along field borders.
🧪 Chemical treatments
- Malathion 50 EC @ 1.5 ml/L
- lambda-cyhalothrin 5 EC @ 0.5 ml/L
- imidacloprid 17.8 SL @ 0.3 ml/L
- acetamiprid 20 SP @ 0.2 g/L
- thiamethoxam 25 WG @ 0.2 g/L
- seed treatment with imidacloprid 600 FS @ 5 mL/kg seed.
🛡️ Prevention
- Time sowing to escape the peak adult activity window — early sowing (before mid-June for kharif cucurbits) reduces infestation.
- Practice crop rotation with non-host crops (cereals, legumes) for at least one season.
- Destroy crop residues by deep ploughing after harvest.
- Use reflective silver mulch to repel adult beetles.
- Cover seedlings with floating row covers for the first 3 weeks where economically feasible.
- Maintain field sanitation — wild Cucumis spp. and Momordica spp. act as reservoirs.
🪴 Affected plants
- Pumpkin, squash, bottle gourd, bitter gourd, cucumber, melon, and other cucurbits.
- In India it is a major pest of all cucurbits nationwide, particularly severe in Uttar Pradesh, Bihar, West Bengal, Odisha, Maharashtra, and Tamil Nadu.
🦋 Natural predators
- Predatory bugs (Nesidiocoris tenuis, Geocoris spp.)
- lacewing larvae
- predatory beetles (Carabidae, Staphylinidae)
- parasitoid wasps (Tetrastichus spp. on eggs, Beauveria brongniartii on larvae and adults)
- and entomopathogenic fungi (Beauveria bassiana, Metarhizium anisopliae).
🌱 Host plants
- Pumpkin, squash, bottle gourd, bitter gourd, sponge gourd, ridge gourd, cucumber, melon, watermelon, and other cucurbits
- wild Cucumis spp. and Momordica spp. are reservoirs.
🔄 Lifecycle
- Eggs laid in soil near host plants hatch in 5–8 days; larvae feed on rootlets for 12–18 days (3 instars); pupation in soil for 7–10 days; adult lifespan 30–60 days.
- Total lifecycle 30–40 days; 5–8 generations per year in tropical India.
📅 Season
- Active year-round in tropical India; peaks during kharif (June–September) and rabi (January–March) cucurbit sowings.
🔎 Appearance
- Adult is an elongate-oval, orange-yellow to reddish-brown chrysomelid beetle with a shiny dorsum and characteristic black or dark brown markings on the pronotum and elytra; legs and antennae are partly dark.
- Adults are active jumpers when disturbed and emit a characteristic defensive secretion.
- Larvae are slender, white to cream-coloured, brown-headed grubs with three pairs of thoracic legs, found feeding on rootlets and stems below the soil surface.
💥 Damage level
- High
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- Indian Subcontinent (pan-India in cucurbit tracts)
- Southeast Asia
- China
- Japan
- Philippines
- Africa
- Middle East
- Australia.
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