Calibrating Hand-Held and Backpack Sprayers for Applying Pesticides

Publication Number 456-502, Posted March 1997
This is a revision of VCE Publication 456-502, Calibrating Hand-Held and Backpack Sprayers for Applying Pesticides (1986) by S. M. Zedaker and T. J. Nichols (former Extension Specialist and Assistant Professor, Forestry, Virginia Tech).

Figure 3. (A) and (B) show how the angle of the spray pattern affects the width of the pattern. As the angle, x, is increased from (A) to 2x in (B), the pattern width increases proportionately. The height of the nozzle above the ground also affects the width of the spray pattern, as shown in (C) and (D). As the height, y, in (C) increases to a height of z in (D), the pattern width increases proportionately.

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