Abstract: An improved agricultural spray plane of the biplane type, the improvement including a pair of spray booms mounted on each of the lower wings and defining the trailing edge of each of the wings for substantially the entire length of the wings. A spoiler is mounted on the upper surface of each of the lower wings forward of the spray booms to compensate for the elimination of ailerons found on conventional biplanes. Each of the upper wings include an aileron and apparatus for simultaneously controlling ailerons and spoilers is also provided.