The Fruit Fly Species and Damage Profile
Fruit flies belonging to the genus *Bactrocera* (*Bactrocera dorsalis* in tree fruits and *Bactrocera cucurbitae* in cucurbit crops) represent major quarantine pests in tropical horticulture.
Gravid female flies puncture the skin of ripening fruits using a sharp ovipositor to deposit eggs beneath the epidermis. Emerging maggots feed internally on fruit pulp, leading to bacterial rot, premature fruit drop, and total unmarketability.
- Target species: Oriental fruit fly (*Bactrocera dorsalis*) and Melon fruit fly (*Bactrocera cucurbitae*)
- Damage symptoms: Oviposition punctures, resin exuding from sting marks, internal maggot rotting, and fruit drop
- Economic impact: Direct crop destruction and strict international phytosanitary quarantine restrictions
- Susceptible crops: Mango, guava, citrus, papaya, bitter gourd, ridge gourd, bottle gourd, and watermelon
Parapheromone Trapping and Male Annihilation Technique (MAT)
Because adult flies fly actively throughout orchards, conventional cover spraying often fails to control emerging populations. The Male Annihilation Technique (MAT) utilizes sex attractants to lure and trap male flies, disrupting mating cycles.
Methyl eugenol traps attract male *Bactrocera dorsalis* in mango and guava orchards, while Cue-lure traps attract male *Bactrocera cucurbitae* across cucurbit vine vegetable fields.
- Methyl Eugenol Traps: Specifically attract male oriental fruit flies in tree fruit orchards
- Cue-Lure Traps: Attract male melon flies in cucurbit vegetable plantings
- Trap density: Install 10 to 15 traps per hectare suspended at canopy height in shaded branches
- Maintenance: Recharge pheromone dispenser septa every 6 to 8 weeks during fruiting seasons
Bait Sprays, Fruit Bagging, and Orchard Sanitation
The Bait Application Technique (BAT) utilizes spot-sprays of food attractants (protein hydrolysate or jaggery/molasses) combined with a toxicant like Spinosad or Malathion applied to selected tree trunks or lower canopy leaves.
Physical fruit bagging using multi-layer paper or non-woven bags protects fruits from ovipositing flies. Collecting and burying all fallen infested fruits at least 60 cm deep destroys internal maggots before they pupate into the soil.
- Bait spray: Protein hydrolysate or jaggery bait mixed with toxicant applied as coarse splashes on trunks
- Fruit bagging: Bag individual fruits 30 to 45 days before maturity for export-quality produce
- Sanitation: Collect and bury fallen infested fruits deeply to break pupation in soil
- Soil tillage: Deep raking of tree basins exposes pupae to sunlight and predatory birds
Official source
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Indian Institute of Horticultural Research (ICAR-IIHR) ↗Related on KisanPe
Common questions
What is the difference between Methyl Eugenol and Cue-Lure traps?
Methyl eugenol attracts fruit flies of the *Bactrocera dorsalis* complex attacking tree fruits like mango and guava, whereas Cue-lure attracts *Bactrocera cucurbitae* attacking cucurbit gourds.
Why is blanket foliar spraying ineffective against fruit flies?
Adult fruit flies are mobile and do not stay permanently on sprayed leaves, while eggs and maggots develop protected deep inside the fruit pulp where sprays cannot reach.
How does fruit bagging protect mangoes and guavas?
Physical bagging creates a barrier that prevents female fruit flies from landing on and puncturing the fruit skin with their ovipositor.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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