Rice Caseworm: Paraponyx stagnalis Stagnalis (Lepidoptera : Pyralidae)

Local name: Kolave Hulu, Goodu maru Hulu

Damage symptoms:

• The larva feeds on the foliage by scrapping chlorophyll leaving horizontal rows of green material.
• The leaf tips are sharply cut off and the cut portions are turned into cylindrical tubes, is either attached to the plant or seen floating on the water surface

                                                           Damage symptoms of Case worm

Management

Cultural practices:

• Drain water from the field.
• Keep kerosene soaked gunny bags in the field water and dislodge the leaf cases by passing rope or branches of thorny plant.
• The use of correct fertilizer application, wider spacing (30 × 20 mm), and early planting.

Biological Control:

• Spiders, dragonflies, and birds eat the adults.
• There is a nuclear polyhedrosis virus, which is a potential control agent against the rice caseworm.

Chemical control:

• 10-12 DAS  1ml of methyl parathion 50EC or 0.5ml fenitrothion 100EC or 0.9ml diazinon 60EC or 1.3ml monocrotophos 36SL or 2ml chloropyriphos 20 EC or 1.5ml fenthoate 50EC or 2ml phasalone 35EC or 2ml endosalfon 35EC or 2ml quinolphos 25EC in 1 liter of water for spraying crop.
• Transplanted field require 225-230liter/acre spraying chemical or carbofuron 3% 7.6kg/acre granules can be used.