Stem fly

Stem fly: Ophiomyia phaseoli

Symptoms of damage

  • Drooping of the tender leaves and yellowing
  • Serious damage to young plants.
  • The stem where maggot and pupae are present become swollen and start ribbing.
  • Older plants show stunting but are not usually killed.

Identification of the pest

  • Eggs: The egg period lasts about 3 days.
  • Larva: Larval period lasts for 5-6 days. The larva pupates in the larval groove for 8-9 days.
  • Adult: The adult is a small black fly. A female lays 38-79 eggs singly on pods or on flower buds.


  • Conserve natural enemies like Euderus lividus, Eurytoma sp., Euderus agromyzae
  • Seed pelleting with chlorpyriphos @ 4 ml/kg of seed may reduce stem fly.
  • Spray carbaryl 50 WP 1.5 kg 700 L water per ha.
  • Soil application of carbofuran 3G @ 15 kg/ha at sowing
  • Spray Imidacloprid 70 % WG 500 ml/ha a week after germination and second round 10 days after first round or NSKE 5%
  • Timely sowing also minimizes the attack of the pest.



  • TNAU Agritech Portal
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