Gall midge

Gall midge: Orseolia oryzae

Symptom of damage:

  • Maggot feeds at the base of the growing shoot
  • Causing formation of a tube like gall that is similar to “onion leaf” or “Silver-shoot”.
  • Infested tillers produce no panicles.

Identification of insect pest:

  • Egg: The fly lays elongate, cylindrical, shinning white or red or pinkish eggs singly or in clusters (2-6) at the base of the leaves.
  • Larva: Maggot is 1 mm long after hatching with the pointed anterior end. It creeps down the sheath and enters the growing bud. An oval chamber is formed round the site of feeding.
  • Pupa: At the time of emergence the pupa wriggles up the tube with the help of antennal horn to the tip of the silver shoot and projects half way out.Adult: fly is yellowish brown and mosquito-like. The male is ash grey in colour. Adults feed on dewdrops.

ETL: 10% silver shoots

  • Release Platygaster oryzae parasitised galls at 1/10 m2 on 10 days after transplanting (DAT)
  • Early ploughing
  • Harvest the crop and plough immediately
  • Remove the alternate hosts and adjust the time of planting (early)
  • Optimum recommendation of potash fertilizer
  • Setup light trap and monitor the adult flies
  • Spray any one of the following insectcides
    • Phosalone 35 EC 1500 ml/ha
    • Carbosulfan 25% EC 800-1000 ml/ha
    • Chlorpyriphos 20% EC 1250 ml/ha
    • Fipronil 5% SC 1000-1500 g/ha
    • Fipronil 0.3% GR 16670-25000 g/ha
    • Thiamethoxam 25% WG 100 g/ha


  • TNAU Agritech Portal
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