Turmeric Shoot Borer
Conogethes punctiferalis
📖 Description
Conogethes punctiferalis, the Turmeric Shoot Borer or Yellow Peach Moth, is one of the most polyphagous and economically damaging lepidopteran pests of cultivated turmeric in India. The species is widely distributed across the Oriental and Australian regions and is recorded from over 60 host plants spanning many plant families — making it a true agricultural generalist. In turmeric, the most serious damage occurs when the neonate larva hatches on the pseudostem, bores downward through the leaf sheaths into the central growing point, and eventually reaches the rhizome. The direct rhizome damage is compounded by the entry of secondary pathogens — particularly Pythium aphanidermatum (turmeric rhizome rot) and Erwinia spp. — which can destroy an entire rhizome within days of the initial borer damage. This borer–pathogen complex is the single most important biotic constraint on turmeric production in India’s major growing tracts — Erode, Coimbatore (Tamil Nadu), Nizamabad (Telangana), Kandhamal (Odisha), and West Midnapore (West Bengal). The pest has 4–6 overlapping generations per year and is active from June to November, with peak infestation during the monsoon and early post-monsoon periods when the turmeric crop is at its peak vegetative growth. Climate-driven range expansion has been documented since 2010, with the pest now established in turmeric-growing areas of Madhya Pradesh and Chhattisgarh where it was previously absent.
⚠️ Symptoms to watch for
- Bore-hole at the base of the turmeric pseudostem with frass and excreta pushed out
- 'dead-heart' symptom in the central shoot
- wilting and yellowing of the inner leaves
- hollowed-out pseudostem filled with caterpillar excreta when split open.
- In turmeric, the most damaging effect is on the rhizome — larvae that bore downward from the pseudostem into the rhizome cause direct yield loss and create entry points for soft-rot bacteria (Pythium, Erwinia).
- Yield losses of 25–45 % are common in untreated turmeric crops in Andhra Pradesh, Tamil Nadu, Odisha, and Telangana.
🩹 Treatment
- Cultural: remove and destroy infested pseudostems before the larva bores into the rhizome — roguing at weekly intervals during the peak infestation period (July–October).
- Mechanical: install pheromone traps (Conogethes punctiferalis synthetic sex pheromone) at 8/ha to monitor and trap adult males
- light traps at 1/ha for additional monitoring.
- Biological: spray Bacillus thuringiensis var. kurstaki (Btk) at 1 kg/ha at 15-day intervals from July
- release Trichogramma chilonis at 50,000/ha for egg parasitism.
- Chemical: spray chlorpyrifos 20 EC @ 2.5 ml/L or quinalphos 25 EC @ 2 ml/L directed at the pseudostem base, repeated at 15-day intervals during peak infestation.
🌿 Organic treatments
- Spray neem oil (Azadirachta indica) at 3 % emulsion at 15-day intervals from July
- apply Beauveria bassiana at 5 g/L on the pseudostem base
- install pheromone traps at 8/ha for mass trapping of males
- intercrop with non-host species (pulses, vegetables) to disrupt adult oviposition
- soil application of neem cake at 250 kg/ha at planting to discourage rhizome boring.
🧪 Chemical treatments
- Chlorpyrifos 20 EC @ 2.5 ml/L, Quinalphos 25 EC @ 2 ml/L, Lambda-cyhalothrin 5 EC @ 0.5 ml/L, Emamectin benzoate 5 SG @ 0.4 g/L.
- Direct spray at pseudostem base.
- Pre-harvest interval 21 days
- turmeric rhizomes are harvested 8–9 months after planting so residues are typically below MRL by harvest.
🛡️ Prevention
- Plant only disease- and pest-free certified rhizome seed
- rogue out infested pseudostems weekly from July onwards and burn them
- adopt crop rotation with non-host cereals (rice, maize) for at least one season between turmeric crops
- remove and destroy crop residues after harvest — do not leave infested pseudostems in the field
- install pheromone traps at 8/ha from June to monitor adult emergence
- avoid planting turmeric adjacent to infested ginger or cardamom fields.
🪴 Affected plants
- Turmeric (Curcuma longa)
- ginger (Zingiber officinale)
- cardamom (Elettaria cardamomum)
- mango
- litchi
- castor
- sunflower
- cotton
- millets
- and over 60 other recorded hosts — one of the most polyphagous lepidopteran pests in the Indian subcontinent.
🦋 Natural predators
- Trichogramma chilonis (egg parasitoid — 30–50 % field parasitism in unsprayed fields)
- Telenomus sp. (egg parasitoid)
- Apanteles taragamae (larval braconid parasitoid)
- Bracon hebetor (larval parasitoid)
- Brachymeria sp. (pupal chalcid parasitoid)
- predatory pentatomid bugs (Eocanthecona furcellata)
- and spiders.
🌱 Host plants
- Curcuma longa (turmeric)
- Zingiber officinale (ginger)
- Elettaria cardamomum (cardamom)
- Mangifera indica (mango)
- Litchi chinensis (litchi)
- Ricinus communis (castor)
- Helianthus annuus (sunflower)
- Gossypium spp. (cotton)
- Sorghum
- Pennisetum
- and over 60 other recorded hosts.
🔄 Lifecycle
- Adult female lays 80–200 eggs singly or in small clusters on tender leaves and pseudostems.
- Egg stage 5–7 days.
- Larva passes through five instars over 25–35 days, boring into and feeding inside the pseudostem and rhizome.
- Pupation occurs inside a silken cocoon in the soil or in the dried shoot; pupal stage 10–15 days.
- Adult longevity 7–15 days.
- Total lifecycle 45–60 days.
- Four to six overlapping generations per year in tropical India.
📅 Season
- Active June–November across the Indian turmeric belt; peak infestation July–October during the monsoon and post-monsoon periods.
- Population crashes during the hot dry season (April–May) when the pest survives as diapausing larvae inside dried crop residues.
🔎 Appearance
- Adult is a bright-yellow pyralid moth with numerous conspicuous black spots scattered across both pairs of wings — giving rise to its common name 'Spotted Shoot Borer'.
- The body is yellow-orange with black spots on the thorax and abdomen; antennae are filiform.
- Larva is a pale pinkish-brown caterpillar with a dark-brown head capsule, scattered dark setae on each segment, and well-developed thoracic and abdominal legs.
- Pupa is dark brown, 12–14 mm long, found inside a silken cocoon in the soil or within the bored shoot.
💥 Damage level
- Severe
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- Indian Subcontinent
- South Asia
- Southeast Asia
- East Asia (China, Japan)
- Australia
- Pacific Islands.
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