An insect monitoring device and method of monitoring insects having a body with a slide out tray assembly. The tray assembly has a replaceable sheet assembly with an exposed adhesive surface. The tray assembly has an aperture through which insects may pass to encounter the adhesive surface. Spaced from the adhesive surface is a heating element to warm the interior of the monitoring device. A sheet assembly has a reflective side to reflect heat back onto the adhesive surface and an insulating side to increase efficiency. A sensor array images the adhesive surface and transmits images to a remote computer. Other sensors may also be present on the sensor array.