Abstract: A device for combatting troublesome flying insects comprising a sloped target area containing a wet or dry dosage of tetrahydro-2-(nitromethylene)-2H-1,3-thiazine lethal to flies and covered with a closely fitting or flush grill; a hollow base section having a bottom and side or sides; a cavity for the containment and concealment of intoxicated flies; and a means of supporting said target area. In the case where the device contains a wet amount of said insecticide, the device further contains a means of establishing fluid contact between the target area and a fluid reservoir in the base section. Also claimed is a method for combatting flies utilizing the devices of the invention.