Mango Shoot Gall Midge
Procontarinia mangiferae
📖 Description
The Mango Shoot Gall Midge (Procontarinia mangiferae) is one of the most distinctive pests of mango in India — not because of the magnitude of yield loss it causes (which is generally moderate, ~5–15 % reduction in severely infested orchards) but because of the highly specialised plant-insect interaction that defines its biology. The female midge oviposits into the soft tissue of expanding mango leaves, and the hatching larva secretes chemical signals that induce the leaf cells to proliferate into a characteristic conical gall — a tumour-like plant growth that houses, feeds, and protects the larva. Each gall is essentially a self-built microhabitat, and the relationship is so specific that the gall shape and position is diagnostic for the midge species. India is the world’s largest mango producer with ~20 million tonnes annual production (≈40 % of global output) from ~2.5 million hectares across Andhra Pradesh, Uttar Pradesh, Telangana, Karnataka, Bihar, Gujarat, Tamil Nadu, and Maharashtra. The pest is most severe in the Konkan belt of Maharashtra (Ratnagiri — the Alphonso heartland) and the coastal Karnataka tract, where high humidity and continuous leaf flushing support rapid midge reproduction. The mango nursery industry of Maharashtra and Andhra Pradesh — worth several hundred crore rupees annually — is particularly vulnerable because galled nursery plants are unsaleable, and the pest can be unknowingly spread across the country via infested nursery stock. Climate change is expanding the pest’s range poleward; it is now regularly recorded in north Indian orchards (Uttar Pradesh, Punjab) where it was historically absent.
⚠️ Symptoms to watch for
- Small (2–6 mm diameter), conical or wart-like green galls on the upper surface of mango leaves — the diagnostic symptom.
- Each gall has a corresponding slight depression on the underside.
- Heavy infestation can produce 100+ galls per leaf, causing the leaf to curl, distort, and prematurely drop.
- Young shoots with heavy gall load become stunted and may die.
- The cosmetic damage to nursery plants and ornamental mango is a particular concern — galled leaves render specimen trees unsuitable for landscaping sales.
🩹 Treatment
- Cultural: prune and destroy galled leaves during the off-season to reduce the overwintering population.
- Chemical: spray dimethoate 30 EC at 1.5 ml/L or imidacloprid 17.8 SL at 0.3 ml/L at the leaf-flush stage when adults emerge and oviposit — the only effective window because larvae inside galls are protected from contact sprays.
- Repeat the spray at 15-day intervals through the entire flushing period (typically February–April in peninsular India).
🌿 Organic treatments
- Pruning and destruction of galled leaves during the off-season (October–December) to reduce overwintering larvae
- spraying neem oil 2 % at 10-day intervals during leaf flush
- application of entomopathogenic fungi (Metarhizium anisopliae, Beauveria bassiana) at 1 × 10^8 CFU/ml on soil beneath the tree canopy to infect pupating larvae
- conserving predatory ants that forage on the leaf surface and prey on adult midges.
🧪 Chemical treatments
- Dimethoate 30 EC @ 1.5 ml/L, Imidacloprid 17.8 SL @ 0.3 ml/L, Thiamethoxam 25 WG @ 0.4 g/L, Acephate 75 SP @ 1 g/L.
- Sprays must be timed to the leaf-flush period when adults emerge
- spray contact-action insecticides targeting adults only is ineffective.
🛡️ Prevention
- Avoid excessive nitrogen fertilisation, which promotes the tender leaf-flush growth that the midge oviposits on
- prune the canopy annually to encourage uniform leaf flushing (which concentrates adult emergence and improves spray timing)
- remove and burn galled leaves during the off-season
- avoid planting mango nurseries adjacent to established orchards where the pest overwinters
- monitor adult emergence with yellow sticky traps during the January–March leaf-flush period.
🪴 Affected plants
- Mango (Mangifera indica) — primary and economically important host
- galls form on young leaves and tender shoots.
- All commercial Indian cultivars (Alphonso, Banganapalli, Kesar, Dasheri, Langra, Totapuri) are susceptible.
🦋 Natural predators
- Predatory ants (Oecophylla smaragdina, Camponotus compressus) that forage on mango leaves and prey on adult midges and emerging larvae
- predatory thrips (Scolothrips sexmaculatus)
- predatory mites (Amblyseius spp.) that feed on eggs and young larvae
- spiders (Salticidae)
- and the entomopathogenic fungi Metarhizium anisopliae and Beauveria bassiana that naturally infect soil-dwelling pupae.
🌱 Host plants
- Mangifera indica (mango — primary host).
- All commercial cultivars — Alphonso, Banganapalli, Kesar, Dasheri, Langra, Totapuri, Neelam, Bangalora — are susceptible.
🔄 Lifecycle
- Adult female lays 50–100 minute orange eggs in clusters of 5–15 in the soft tissue of expanding mango leaves.
- Eggs hatch in 3–5 days.
- Larva develops inside the induced gall through 3 instars over 15–25 days; the gall grows with the larva.
- Mature larva drops from the gall to the soil and pupates at 2–5 cm depth; pupal stage 10–15 days.
- Adult longevity 2–4 days (no feeding).
- Total lifecycle 30–50 days; 4–6 overlapping generations per year, with peak activity during the mango leaf-flush period (February–April and August–September).
📅 Season
- Peak infestation during the spring (February–April) and post-monsoon (August–September) leaf-flush periods when tender young leaves are abundant.
- Population low during the hot dry months (May–June) and the cool winter (December–January).
🔎 Appearance
- Adult is a tiny, delicate mosquito-like fly (Cecidomyiidae) with a slender orange body, long legs, and translucent wings with reduced venation — typical gall-midge morphology.
- The larva is a minute, spindle-shaped, bright orange-yellow maggot lacking any legs or head capsule, living inside the characteristic conical or pyriform green galls it induces on mango leaves.
- Each gall contains a single larva in a small central chamber.
💥 Damage level
- Moderate
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- Indian Subcontinent (Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Andhra Pradesh, Telangana, Gujarat, Uttar Pradesh, Punjab)
- South Asia (Sri Lanka, Pakistan, Bangladesh, Nepal)
- Southeast Asia (Myanmar, Thailand, Malaysia, Indonesia, Philippines)
- southern China
- Taiwan
- Pacific Islands.
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