The bagworm, Cryptothelea crameri Westwood (Psychidae : Lepidoptera) is an important pest of many ornamental, horticultural and forest plants in Bangladesh. The larva feeds on young leaves and tender bark by making and living within a portable bag of leaves, twigs, barks, spines, etc. The biology, host range, number of generations, and seasonal abundance of the pest have been dealt with in this paper. Brachymeria sp. (Braconidae: Hymenoptera) wasfound to parasitize its larva. The pestcould be collected and destroyed by hand. It could also be controlled by the foliar application ofmalathion (Malathion 57 EC) at 0.1% concentration.