Abstract: A method for spraying pesticides, herbicides or the like in a moving path from above includes extending a support cable across and over the area to be sprayed and tensioning the cable between two vehicles, one on each side of the area to be sprayed. One or more material spraying nozzles or outlets are supported on the cable and fed by a material-delivering conduit also supported on the cable and connected to a source of material supply on one of the vehicles. The cable is tensioned to a preselected tension sufficient to limit sag in the cable, and tension in maintained substantially constant as the two vehicles are advanced forward with the cable and spray nozzle over the path to be sprayed, irrespective of convergence and divergence of the two vehicles. Constant tension is maintained by a hydraulic motor driving a cable storage reel at constant force.