Then, finish filling the tank. When using wettable powders, make a slurry in a separate container and then add the slurry to the tank to ensure good mixing. Getting the right amount of chemicals on the ground is not enough to achieve effective pest control. How the chemical is deposited on the spray target is as important as the amount deposited. Make sure that all nozzle tips are properly aligned.
Some nozzles require overlapping adjacent spray patterns.
Check the nozzle catalog to determine the overlap required for a given type of nozzle. A common cause of non-uniform coverage is clogged nozzles. Watch the nozzles periodically while spraying to detect clogging. Always carry extra nozzles in your tool box, and replace bad nozzles with good ones immediately. In most cases, the pressure gauges on sprayers do not represent the actual pressure at the nozzle tip.