Rice case worm (Nymphula depuntalis , pyrilidae , lepidioptera )

Damaging stage: larva

Symptom of damage:

• Leaf cases floating on water
• Leaves cut at right angles as with a pair of scissors
• Leaves with papery upper epidermis that were fed on
• Skeletonized leaf tissues usually appear ladder-like

Identification of insect pest:

• Egg: circular, light yellow, mature eggs are darker and develop two purplish
• Larva: Pale translucent green with orange head
• Pupa: The pupa is cream in Mature pupa is silvery white.
• Adult: Moth is small, delicate white with pale brown wavy It is bright white with light brown and black spots.

Life cycle

Egg —4-6 days–> Larvae —18-22 days–> Pupa –5-7 days —-> Adult

Management

• Spider, dragon flies, birds, NPV
• Use of foliar treatment of carbamate insecticide , avoid pyrethroid .