The disclosed invention is an improved delta trap for insect pest control using insect pheromone as primary attractant. The delta trap is made of yellow material so as to attract the insects towards the spectrum reflected by the trap. The improved trap has circular windows, on each of the two slanting sides, whose numbers, size and positions have been optimized for maximizing the attraction and minimizing the escapes of insects. The improved delta trap has sticky surface on one or all the internal walls/surfaces, so as to enhance the efficiency/ease of the insect catch. A pheromone lure is placed hanging or stuck on to the internal surface of the trap to lure the male adults towards the trap.
