Abstract: An apparatus is provided for reducing the population of flying insects. A first transparent cylindrical container is oriented with its axis generally vertical and provides a plurality of storage shelves for holding an insect bait. Natural air convection currents flowing over the bait produce an insect-attracting scent in the vicinity of the apparatus for attracting insects to the apparatus. A second transparent cylindrical container provides a space for containing a liquid defatting agent, and has an open top lip so that the liquid may spill over the lip and run downward across the outer surface of the second container. A storage container is positioned below the second container to receive the liquid that spills over the top lip. A pump is interconnected between the storage container and the second container so as to pump the liquid from the storage container to the second container, over the top lip, and back to the storage container in a continuous process.