Check each nozzle to make sure the flow rates are correct. Replace nozzles if the flow rates are in error of 10 percent. Spray boom bounce should be minimized with support members. Check spray uniformity by spraying water on a concrete surface and observing the amount of streaking that occurs when the water dries. Irregular spray patterns result from damaged nozzle tips, mismatched nozzles and uneven booms.
Pesticide drift is a major concern of land application of pesticides.
In addition to reduction in effectiveness, pesticide drift can damage non-target areas. One method to decrease drift is to use a low volatile formulation that is less likely to volatize and drift. Pesticide drift also can be controlled by reducing the number of small droplets emitted from the sprayer. Nozzle type, angle and orientation, boom height, and operating pressure can influence the production of driftable drops. A droplet of 100 microns in diameter can drift about 50 feet in a 3-mile per hour breeze where a 10 micron droplet can drift 3000 feet.