Fruit fly: Bactrocera (Dacus) dorsalis
Symptoms of damage
- Maggots puncture into semi-ripe fruits with decayed spots
- Oozing of fluid and brownish rotten patches on fruits.
- Dropping of fruits.
Identification of pest
- Egg - pear shaped, light yellowish
- Nymph - Oval, scale-like, greenish white
- Settle down on a succulent part of leaves.
- Adult - White, tiny, scale-like adults.
Management
- Collect fallen infested fruits and dispose them by dumping in a pit and covering with soil.
- Provide summer ploughing to expose the pupa
- Monitor the activity of flies with methyl eugenol sex lure traps.
- Heavy application of dust and sprays of pyrethrum or BHC
- Spray malathion 50 EC 2ml/lit.
- Field release of natural enemies Opius compensates and Spalangia philippines
Note
- Prepare bait with methyl eugenol 1% solution mixed with malathion 0.1%.
- Take 10 ml of this mixture per trap and keep them in 25 different places in one hectare between 6 a.m. and 8 a.m.
- 250 ml capacity wide mouthed bottle fitted with hanging device at its neck.
- Change the solution at fortnightly interval from March to July.