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Crop Protection :: Pest of paddy

Leaf folder (or) leaf roller: Cnaphalocrocis medinalis / Marasmia patnalis

Symptom of damage:

  • Larva folds the leaves longitudinally and larva remains inside
  • Larva scrapes the green tissues of the leaves, which later becomes white and dry
  • During severe infestation the whole field exhibits scorched appearance

Identification of insect pest:

  • Egg: Flat, oval in shape and yellowish white in colour
  • Larva: Greenish translucent
  • Adult: Moth is yellowish brown with many dark wavy lines in centre and dark band on margin of wings.

 

Management:
ETL: 10% leaf damage at vegetative phase and 5% of flag leaf damage at flowering

  • Release Trichogramma chilonis @2 cc (40,000/ac) thrice at 37, 44 and 51 days
  • Avoid excessive nitrogenous fertilizers
  • Keep the bunds clean
  • Spray NSKE 5 % or Azadirachtin 0.03% 400 ml/ac
  • Spray any one of the following insectcides
    • Phosalone 35 EC 600 ml/ac
    • Chlorpyriphos 20 EC 500 ml/ac
    • Acephate 75 % SP 267-400 ml/ac
    • Carbosulfan 6% G 6.7 kg/ac
    • CartapHydrochloride 50 % SP 400 g/ac
    • Chlorantraniliprole 18.5% SC 60 g/ac
    • Chlorantraniliprole 0.4% G 4 kg/ac
    • Fipronil 80%WG 20-25 g/ac
    • Flubendiamide 39.35% M/M SC 20 g/ac
    • Flubendiamide 20% WG 50-100 g/ac
    • Thiamethoxam 25% WG 40 g/ac
white and dried leaves Larva inside leaf fold
Egg Larva Adult
Trichogramma chilonis egg card Keep the bunds clean Set up light trap

 

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