Skip to content

Fruit fly (Bactrocera spp.) in orchards

The oriental fruit fly Bactrocera dorsalis and related Bactrocera species are the most damaging direct pests of mango and several other fruit crops in India. Their larvae develop inside the fruit, making harvested produce unmarketable and disqualifying consignments under quarantine rules of importing countries. ICAR-IIHR and ICRISAT have developed integrated management protocols built around male annihilation with methyl eugenol traps.

Identification and symptoms

Adults are 6-8 mm long with a brown body and clear wings marked by a costal stripe. Females lay eggs beneath the fruit skin near maturity; pinhole oviposition punctures often exude a sticky droplet. Maggots tunnel through the pulp, causing premature fruit drop, brown discolouration and secondary rot. B. dorsalis, B. zonata and B. correcta are the principal Indian species.

Host crops and life cycle

The pest is highly polyphagous on mango (Mango Alphonso, Mango Banganapalli Beneshan, Mango Kesar, Mango Dasheri, Mango Himayat Himam Pasand, Mango Totapuri), guava, sapota, ber, citrus and many vegetables. Pupation occurs in the soil under the canopy. Multiple overlapping generations occur per year in warm regions, with peak activity coinciding with mango maturity.

Damage and economic impact

ICAR-IIHR reports yield losses of 10-40% in mango from Bactrocera dorsalis alone, with even higher losses where unmanaged populations build through successive flushes. The pest is a major non-tariff trade barrier on Indian mango exports.

Management

The IPM package developed by ICAR-IIHR and ICRISAT integrates:

  • Monitoring and male annihilation: 20-25 methyl-eugenol-baited traps per hectare (around 6 per acre), installed at fruit set and refreshed periodically; reported population reduction of 90-95% under sustained deployment.
  • Sanitation: regular collection and deep burial or solarisation of fallen, infested fruits to break the life cycle.
  • Bait sprays: spot applications of jaggery (10%) plus an approved insecticide on the lower canopy to kill feeding adults.
  • Cultural: early harvest at correct maturity; integration with canopy management (Mango Canopy Training Pruning) and flowering management (Mango Flowering Management) for synchronised cropping.

See also: Mango Orchard Establishment Hdp, Mango Value Addition Rolls Thandra and the various mango variety entries.

References

  1. IPM of Mango fruit fly. ICAR-IIHR.
  2. Integrated fruit fly Bactrocera dorsalis management technology in mango. ICRISAT.