A roll for assembling a device (2) for detection and elimination of pest insects includes a wound up, continuous band of fibrous material, the band having a main portion (22) and a first flap folded thereover, wherein at least one aperture (35) is arranged in the main portion along at least part of the length of the continuous band, the face facing away from the first flap such that the adhesive strip completely covers over the at least one aperture, the aperture being at least partially filled with an insecticide in powder form. The roll may include a second flap, wherein the first flap and the second flap at least partially overlap and the second flap is sandwiched between the main portion and the first flap.