Insect capture is improved by providing a glue board having an adhesive coating on its front surface and forming a pattern of insect attractant. UV light on that front surface. That pattern includes areas of bright UV light generated by light-emitting diodes behind and visible through the glue board by flying insect, dimmer areas of UV light that bounces off other portions of the device onto the glue board, and areas of shadow on the glue board where no or little UV light is present.