What should I do if the spray button on the wand sticks in the “on” position and won’t stop spraying?

Push down and turn the pump handle counter clockwise while it is in the down & lock position. This will release the pressure so no more liquid is forced out of the wand.

While releasing the pressure make sure you are holding the wand tip close to the ground in an area that is ok to be treated. Avoid the lawn, flowers, and other plants that you don't want to kill.