Abstract: The present invention provides method and apparatus for forming a collapsible trap for trapping flying insects, particularly Gypsy moths. The trap includes a housing or enclosure with at least one entrance port into said housing for enabling insects to enter, and an overhead shade above this port to guide the insect into the port and to block from the port sunlight, which might otherwise attract the insect away from the trap. A sex lure and a volatile insecticide are provided within the housing to attract insects inside and then to exterminate them. The housing is formed from a single integral sheet of stiffly flexible material, such as water-resistant coated cardboard or plastic, having multiple panels joined together along crease lines acting as hinges. The trap can be folded along two of its crease lines into a flat configuration for advantageously facilitating transport, handling, and storage of the trap in its collapsed state.