A mast sprayer for the control of small quelea roosts and breeding colonies is described. Avicide liquid is atomized by five Mini‐ulva rotary atomizers mounted on a light aluminium mast which is adjustable up to 9 m in height. Power is supplied by sealed rechargeable batteries which drive the atomizers and a small positive displacement gear pump. Droplet size can be varied by altering the voltage applied to the atomizers. The batteries require recharging or replacing after approximately 2.5 hours of spraying. The sprayer is operated by two men and, with practice, can be carried in the upright position, whilst operating, so as to locate it correctly with respect to the prevailing wind. The sprayer is designed to operate silently to avoid frightening the birds.