An insect killing system has a blower drawing air entraining insects from below a vacuum machine, impelling the air upward, a flange oriented horizontally at an outlet to the blower, and a killing assembly affixed to the flange. The system is characterized in that the killing assembly comprises a plurality of panels of a common width, having an upper edge, a lower edge, and opposite side edges defining an area for each panel, the area closed by a relatively thin perforated sheet material exhibiting a matrix of through holes, individual panels affixed by the bottom edge to the flange on opposite sides, with each panel oriented by a steep angle from vertical, with each panel in the plurality parallel to and spaced apart from one or more adjacent panels, such that the area defined by an inside diameter of the flange is covered by the plurality of adjacent parallel panels.
