Cinnamon Bark Borer
IchthyuraTerminalis
📖 Description
Cinnamon Bark Borer (IchthyuraTerminalis, sometimes referred to under related genera), is an important wood-boring pest of cinnamon across the Indian subcontinent, particularly severe in the major cinnamon-growing belts of Kerala (Kozhikode, Malappuram, Kannur, Kasaragod, Wayanad), Karnataka (Dakshina Kannada, Udupi, Kodagu, Chikmagalur), Tamil Nadu (Nilgiris, Coimbatore), Andaman & Nicobar Islands and parts of the Western Ghats where India cultivates cinnamon on over 15,000 hectares (India is a moderate producer of cinnamon, with most production concentrated in Kerala and Karnataka — Indian cinnamon is highly valued in domestic spice markets and for traditional Ayurvedic medicine, and the bark of the related Cassia is also widely harvested). The pest is unusual among cinnamon pests because (a) the larvae bore beneath the bark where they are protected from natural enemies and contact insecticides — by the time bark cracking and frass are visible the larva is already well-established inside, (b) the pest directly affects the harvestable product (bark) — affected trees cannot be harvested for spice production for at least one season after the borers are controlled, (c) the pest has a long life cycle (4-8 months) — only 1-2 generations per year — meaning that a single missed season of management leads to multi-year infestation buildup, (d) the pest has a narrow host range (essentially cinnamon and related Lauraceae) — meaning that quarantine of new plantings and planting away from infested plantations can prevent establishment, (e) the pest preferentially attacks stressed trees — drought, waterlogging, mechanical injury and unbalanced fertilization all predispose cinnamon trees to attack, and (f) the adult moth is cryptic and closely resembles a piece of bark, making it difficult to detect until infestation is severe. IPM with weekly trunk inspection (most critical for early detection), mechanical cleaning of galleries with a hooked wire (most effective control for bark borers), trunk pasting with neem oil + clay or bordeaux paste (deters oviposition and heals wounds), biological control (Beauveria bassiana as trunk paste, Bt on young larvae before they enter bark), and need-based insecticide rotation (apply as trunk spray at first sign of infestation) provides effective and sustainable control. The pest is a particular concern for Indian cinnamon growers because the long life cycle and the direct effect on harvestable bark mean that even a moderate infestation can cause complete loss of the season’s harvest — making early detection through regular trunk inspection essential. The pest is most severe in neglected plantations and in plantations where trees are stressed by drought, waterlogging or improper fertilization. Climate change with more frequent droughts is increasing the susceptibility of cinnamon trees to borer attack across the Western Ghats region.
⚠️ Symptoms to watch for
- Bark cracking and splitting on trunk and main branches, characteristic horizontal galleries beneath the bark (revealed when bark is peeled), frass and sawdust accumulation at the base of the tree and in bark crevices, dieback of branches, yellowing and wilting of foliage, decline and eventual death of trees in severe infestations, reduction in bark yield and quality (rendering affected trees unharvestable for spice production), yield loss 30-60% in cinnamon, 80-100% loss in late-stage outbreak with severe trunk damage
🩹 Treatment
- Inspect tree trunks and main branches weekly for bark cracking and frass, clean out galleries with a hooked wire and kill larvae inside, paste tree trunks with neem oil + clay mixture to deter oviposition, apply need-based insecticide as trunk spray at first sign of infestation, prune and destroy heavily infested branches, maintain proper tree vigour through balanced fertilization and irrigation
🌿 Organic treatments
- Clean out galleries with a hooked wire and kill larvae inside (mechanical control — most effective for bark borers), paste tree trunks with cow dung + clay + neem oil mixture to deter oviposition, apply Beauveria bassiana @ 5 g/L as trunk paste or spray, apply Metarhizium anisopliae @ 5 g/L as trunk spray, spray neem oil 1% + 5 g/L soap on tree trunks, apply Bacillus thuringiensis (Bt) @ 1 kg/ha on young larvae before they enter bark, spray NSKE 5%, paste trunks with lime + copper sulphate + neem oil mixture (bordeaux paste with neem), prune and burn heavily infested branches
🧪 Chemical treatments
- Chlorantraniliprole 18.5 SC @ 0.3 ml/L (trunk spray), Lambda-cyhalothrin 5 EC @ 0.5 ml/L (trunk spray), Profenofos 50 EC @ 1 ml/L (trunk spray), Imidacloprid 17.8 SL @ 0.3 ml/L (soil drench for systemic action), Emamectin benzoate 5 SG @ 0.3 g/L (trunk spray) — apply as full cover trunk spray at first sign of infestation. Always rotate modes of action to slow resistance development. Note: avoid spraying insecticides on harvestable bark close to harvest to avoid residue issues
🛡️ Prevention
- Inspect tree trunks and main branches weekly for bark cracking and frass, maintain proper tree vigour through balanced fertilization and irrigation (stressed trees are more susceptible), avoid mechanical injury to tree trunks (which attracts ovipositing females), paste tree trunks with lime + copper sulphate mixture (bordeaux paste) to deter oviposition and heal wounds, prune and destroy heavily infested branches during dormant season, maintain proper tree spacing (3 m x 3 m) to reduce humidity buildup, use balanced fertilization (avoid excess nitrogen which favours larval development), quarantine new plantings for 30 days before introducing into main plantation, plant resistant varieties where available, avoid waterlogging which stresses trees
🪴 Affected plants
- Cinnamon, Cassia, Camphor Tree, Other Lauraceae Trees
🦋 Natural predators
- Predatory Birds (Woodpecker, Drongo, Oriole), Predatory Beetles (Clerid, Staphylinid), Parasitoid Wasps (Bracon, Ichneumon), Spiders, Ants (against young larvae), Predatory Bugs (Praying Mantis, Assassin Bug)
🌱 Host plants
- Cinnamomum verum, Cinnamomum cassia, Cinnamomum camphora, Other Lauraceae
🔄 Lifecycle
- Female lays 100-300 eggs singly or in small clusters in bark crevices and wounds.
- Eggs hatch in 7-12 days.
- Larvae bore beneath the bark and feed on the cambium and inner bark for 4-8 months, passing through 5-6 instars.
- Pupation occurs in the gallery or in a silken cocoon at the gallery entrance; pupal stage 15-25 days.
- Adult lifespan 10-15 days; female lays 100-300 eggs.
- Total life cycle 4-8 months; 1-2 generations per year in India.
📅 Season
- Year-round in tropical India; adult emergence peaks Mar-May (pre-monsoon) and Sep-Nov; damage most visible Jun-Sep (monsoon — bark softens and cracks become apparent)
🔎 Appearance
- Mature larva is a creamy-white, cylindrical, wood-boring caterpillar with a brown head capsule and 5 pairs of prolegs; body covered with sparse short setae and faint reddish-brown markings on each segment.
- Larvae are rarely seen as they bore beneath the bark of cinnamon trees, creating characteristic horizontal galleries filled with frass and sawdust.
- Adults are small greyish-brown moths (20-25 mm wingspan) with darker zigzag markings on the forewings and pale greyish hindwings — at rest, the moth holds its wings tent-like over the body and closely resembles a piece of bark.
- Eggs are laid singly or in small clusters in bark crevices and wounds.
💥 Damage level
- Moderate
🔁 Reproduction rate
- Slow
🗺️ Geographic regions
- Indian Subcontinent
- South Asia
- Southeast Asia
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