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Crop Protection :: Pest of paddy

Rice case worm: Nymphula depunctalis 

Symptom of damage:

  • Caterpillars feed on green tissues of the leaves and leave become whitish papery
  • Tubular cases around the tillers by cutting the apical portion of leaves
  • Floating of tubular cases on the water
  • Cutting off leaf tips to make leaf cases

Identification of insect pest:

  • Egg: Individual egg is circular, flattened, and measures 0.5 mm in diameter. It is light yellow and has a smooth surface. Mature eggs are darker and develop two purplish dots.
  • Larva: Pale translucent green with orange head. It has filamentous gills on the sides of the body. The larvae are found hanging from the leaf and measures upto 15mm long.
  • Pupa: The pupa is cream in color and about 5.5 mm long. Mature pupa is silvery white.
  • Adult: Moth is small, delicate white with pale brown wavy markings. The adult moth is about 5 mm long. It is bright white with light brown and black spots.

 

White scrapings on leaf due to feeding  Cutting the apical portion of leaves
Larva Adult

Management:

  • Mix 250 ml of kerosene to the standing water
  • Dislodge the cases by passing a rope and drain water. Collect the cases and destroy
  • Spray Quinalphos 25 EC 80 ml
Pass the rope to dislodge casetubes and eggs Hydrophilid beetle preys caseworm larva

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