The computer controlled air blast system typically sprays to both sides and to the rear. We can, however, spray out one side at a time to facilitate "edging" of a spray block. A separate set of nozzles spray behind the machine to cover the track area after the skidder passes. Any combination of spray patterns can be achieved for the task at hand. We can even target low growing vegetation (0' to 10' in height) or adjust the fan housings to spray higher (up to 25') for taller undesirable understory vegetation.