Abstract: A trap for killing gravid mosquitoes which includes a vessel containing water, an electrocution device with a rough inner surfaced frame supported by a floating ring floating above the water, and a walled structure with an opening on the upper ½ portion of one side of the walls. The vessel with the floating electrocution device is arranged inside of the walled structure to form a tree hole-like trap. The present invention provides an apparatus to kill the gravid mosquitoes, also a method to control the mosquitoes by providing an environment to accommodate the mosquitoes' favored breeding behavior needs and uses water as an attractant to lure the mosquitoes into attempting to land or breed on the rough surface of the electrocution device and be killed. This method can kill the gravid mosquitoes before they lay eggs without any use of chemical poisons.