An insect trapping device includes an enclosure defining a trapping space having a bottom wall with a patterned surface, the pattern dividing the bottom walls inner surface into a plurality of polygonal surface elements, and having openings formed in side wall thereof of a size permitting entry of the insects into the trapping space, and a semiochemical dispenser disposed within the enclosure and for releasing in a controlled manner the semiochemical into the trapping space and into its surroundings. A method of monitoring insects that infest crop in an area using the devices is also provided.
