Calibrating your sprayer means accurately determining how much pesticide you are applying. Calibrating at least once per season, preferably several times, is absolutely necessary to ensure accurate application rates and effective pest control.
Calibration is equally important for planter box insecticide applicators.
Follow the manufacturer's instructions for calibrating planters. There are different ways to calibrate a sprayer. The following steps are one of the methods you can use. Before calibrating, check your sprayer manufacturer's instructions. Some sprayers require a special procedure for calibration.