Abstract: A method for chemical spray treatment of unwanted bird roosts whereby a mixture of water and chemical wetting agents are pumped to the spray location under high pressure through flexible water hose. A single vertical riser pipe is assembled and hinge mounted to a portable base support which is adjusted to match the ground terrain. A water powered rotating sprinkler is attached to the top of the pipe and adjusted to the desired spray arc and radius. The pipe and sprinkler are hoisted to the vertical position, secured, and the roost is sprayed until the birds are soaked. The portable base support is assembled with hinge pins and has adjustments on each leg to allow it to conform to the ground terrain.