Land availability and topography in Puerto Rico dictated the development of a method for evaluating herbicide foliage sprays on individual trees and small plots. A pneumatically operated aluminum mast with six telescoping sections, capable of extending from 12 to 50 ft and mounted on a swivel base, was fitted with two different spray delivery systems. A spray boom consisting of two 10-ft sections of 0.75-inch aluminum pipe and equipped with 12 diaphragm nozzles was mounted on the top of the telescoping mast. An alternate spray system was developed by attaching a modified Spraying Systems BoomJet unit to the top of the telescoping mast. To spray with the above systems, the mast is erected and guyed to a vertical position, the spray unit raised to the proper height, and the mast uniformly rotated through an arc of 240° during which the spray is delivered to opposite 180° portions of a circle. The spray coverage for both systems was similar for an area 20 ft in diam, but the droplet size and distribution was more uniform with the boom than with the Boomjet.