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Crop Protection : Pest of paddy

Gall midge: Orseolia oryzae

Symptoms of damage:

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

Identification of 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.
  • Maggot: Maggot is 1 mm long after hatching with 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 or orange and mosquito like. The male is ash grey in colour. Adults feed on dewdrops.
Onion Leaf Maggot Adult

Management:
ETL: 10% silver shoots

  • Release Platygaster oryzae parasitised galls at 1/10 sq.m on 10 days after transplanting (DAT)
  • Harvest the crop and plough immediately
  • Remove the alternate hosts and adopt early planting
  • Optimum recommendation of potash fertilizer
  • Setup infra red light trap and monitor the adult flies
  • Spray any one of the following insectcides
    • Phosalone 35 EC 600 ml/ac
    • Carbosulfan 25% EC 320-400 ml/ac
    • Chlorpyriphos 20% EC 500 ml/ac
    • Fipronil 5% SC 400-600 g/ac
    • Fipronil 0.3% GR 6.5-10 kg/ac
    • Thiamethoxam 25% WG 40 g/ac
Infra red light trap Platygaster oryzae from parasitized pupa Parasitoid - Platygaster oryzae

 

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