Black Pepper Shoot Borer
Cydia hemidoxa
Borers, Mining & Weevils Insects High Risk 12–15 mm wingspan (adult); 12–15 mm (mature larva)
📖 Description
Cydia hemidoxa is a specialist tortricid moth endemic to the Western Ghats black pepper tract of Kerala, Karnataka, and Tamil Nadu. India is the world’s second-largest pepper producer (≈50,000 tonnes/year from ≈130,000 ha), and the shoot borer is one of the most economically damaging pests in young plantations. Yield losses of 25–40 % are common in 2–3-year-old plantings in Idukki, Wayanad, and Kodagu districts. The species is most active during the southwest monsoon (June–September) when high humidity favours larval survival and tender new shoots provide ideal oviposition sites. Multi-voltine, with 4–5 overlapping generations per year.
⚠️ Symptoms to watch for
- Terminal shoots wilt suddenly and droop; frass-filled boreholes are visible at the base of wilted shoots; leaves above the bore point turn brown and hang dry; successive shoot death gives the vine a 'stag-headed' appearance; in young plantations entire vines can be killed by repeated infestation of the main leader shoot.
🩹 Treatment
- Prune and burn all wilted shoots 5 cm below the lowest borehole — do this weekly during the monsoon peak (June–September). Spray lambda-cyhalothrin 5 EC at 0.5 ml/L or emamectin benzoate 5 SG at 0.3 g/L at 30-day intervals during peak flight. Use pheromone traps (pepper shoot borer lure) at 4/ha for monitoring — threshold is 5 moths/trap/week.
🌿 Organic treatments
- Prune and burn infested shoots weekly. Spray neem oil (1 % Azadirachtin) at 5 ml/L plus a sticker at 15-day intervals. Apply Beauveria bassiana at 5 g/L. Install light traps at 1/ha during peak flight (June–September) to mass-trap adults. Maintain shade tree canopy at 30–40 % — heavily shaded and fully exposed plantations both suffer more damage than optimally shaded ones.
🧪 Chemical treatments
- Lambda-cyhalothrin 5 EC (0.5 ml/L), emamectin benzoate 5 SG (0.3 g/L), or chlorantraniliprole 18.5 SC (0.3 ml/L). Apply as a foliar spray covering all foliage and the leader shoot. Repeat at 30-day intervals during peak flight.
🛡️ Prevention
- Plant resistant cultivars such as 'Panniyur-5' and 'IISR-Shakti'. Maintain standard shade (30–40 % canopy). Avoid excessive nitrogen fertilisation which produces soft succulent shoots preferred by ovipositing females. Train vines on living standards (Erythrina, Gliricidia) which are less favourable for oviposition than dead standards.
🪴 Affected plants
- Black pepper (Piper nigrum) is the sole host. All Indian cultivars including 'Panniyur-1', 'Karimunda', and 'Kottanadan' are susceptible; young plantations (1–4 years) suffer the worst damage.
🦋 Natural predators
- Trichogramma chilonis (egg parasitoid, 20–30 % parasitism in unsprayed plantations), Apanteles taragma (larval braconid parasitoid), Brachymeria spp. (pupal chalcid parasitoid), predatory bugs (Anthocoridae), and spiders (Salticidae, Thomisidae) that prey on adults.
🌱 Host plants
- Piper nigrum (black pepper — sole cultivated host). Wild Piper spp. (P. longum, P. betle) may serve as reservoirs in forest margins.
🔄 Lifecycle
- Egg (5–7 days, laid singly on tender shoots) → Larva (18–25 days, 5 instars, internal borer) → Pupa (8–12 days, in leaf fold or soil) → Adult (10–15 days).
- Multivoltine — 4–5 overlapping generations per year, with peak activity during the southwest monsoon.
📅 Season
- Active throughout the year in humid Western Ghats tracts; peak activity June–September (southwest monsoon) and October–November (northeast monsoon).
- Lowest activity in dry season (February–April).
🔎 Appearance
- Adult is a small dark-brown tortricid moth with irregular lighter grey mottling on the forewings and a characteristic pale oval patch at the outer corner; hindwings are uniform greyish-brown; at rest the wings are held roof-like over the body.
- Larvae are pinkish-cream caterpillars with a dark brown head capsule and a sparse covering of pale setae; mature larvae reach 15 mm.
💥 Damage level
- Severe
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- Western Ghats black pepper tract of India (Kerala — Idukki
- Wayanad
- Kannur; Karnataka — Kodagu
- Dakshina Kannada
- Chikmagalur; Tamil Nadu — Nilgiris
- Theni). Also reported from Sri Lanka
- Malaysia
- Indonesia
- and Thailand.
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