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1. Larvae cut small pieces of the leaf tips, form tubular cases, remain inside the case, which is attached to the plant or seen floating on water surface.
2. Larvae feed on foliage by scraping chlorophyll leaving horizontal rows of green material, giving a ladder like appearance.
3. The larva moves into new leaf casing after each molting. The larva consume the entire leaf tissue leaving the upper epidermis which is papery and whitish. When many larvae attack a plant most of leaf tips are cut for making cases.