Hand-held and backpack sprayers are inexpensive tools used to apply pesticides on small acreages to protect them from weeds, brush, trees and vines. Effective vegetation management depends on applying the proper amount of herbicide, and this can only be done if the spray equipment is calibrated accurately for the desired rate.
There are a number of techniques for using a backpack sprayer when spraying an area or plot. Hold the nozzle tip steady at a suitable height above the target surface, usually within a range of 14 to 18 inches. Or, swing the wand back and forth in a pendulum motion as you walk. With either technique, it is essential that you achieve uniform coverage of the treatment site. Use the same pressure, speed and technique in the application that was used to calibrate the herbicide.
Below are resources appropriate for reference when calibrating all types of herbicide spray equipment:
Virginia Tech Bulletin Number 456-502
National Science Foundation for Integrated Pest Management (CIPM)
Calibrating spray equipment before applying herbicides offers numerous benefits. This video goes over calibration techniques, as well as important points to remember when calibrating spray equipment.
Video: Equipment for low-volume basal
This video reviews the proper equipment needed for a low-volume basal application, which can be very effective for selective control of unwanted trees.