Gamar defoliator, Calopepla leayana Latr. (Chrysomelidae : Coleoptera) is a major defoliator of gamar (Gnielina arborea Roxb.)  in Bangladesh. Both the larva and the adult feed on the leaves making irregular holes on them. The distribution, description and biology of various developmental stages of the pest are provided. The pest has three generations in a year, hibernating as an adult from November to May. A common pupal parasite, Brachymeria sp. and an egg parasite, Tetrasticlnis sp. were recorded. Biological, chemical, physical and mechanical method for the control of the pest have been discussed.