Adults are small fragile moth with a wing span of about16 mm. The wings are white and speckled (Fig 1). The size of the larva is 13-20 mm and it has a pale green color. The larva makes a cylindrical, tubular case out of a portion of the leaf cut and remains inside it, moving with the case on the leaves.

Damage symptoms

Damage occurs before maximum tillering stage. The larva feeds on the foliage by scraping chlorophyll, leaving horizontal rows of green material (Fig 2). The leaf tips are sharply cut off and the cut portions are turned into cylindrical tubes, the so-called cases, which either may stay attached to the plant or seen floating on the water surface (Fig 3).

Control options

Cultural control: Alternative wetting and drying of infested fields is recommended. Keep rice fields free of weeds as much as possible.

Biocontrol: Protect natural enemies such as spiders, frogs, lady beetles etc. At severe infestation levels, release of Trichogramma at 40,000 wasps per acre per release (100,000 per ha) may be conducted. Release should be conducted at times when adults and eggs are observed in the field.

Chemical control: At pest infestation levels higher than 1-2 cases/hill, a chemical pesticide may be applied according to label instruction (consider Green and Yellow List).