PURPOSE: To set a discharging quantity of liquid, e.g. herbicide, accurately by providing a spray head having a motor spray element and a handset.

CONSTITUTION: In the normal operation, a trigger 14 is operated to open the valve in a handset 6 and feed a herbicide through a tube 10. The herbicide. flows along a liquid supply duct contained in a supporting pipe 8 to a spray head 2 and discharged from a spray 4 as a series of spray. Flow rate of the spray 4 can be regulated by means of a knob 13 and thereby the width of spray can be varied. Flow rate herbicide flowing toward the head 2 can be regulated by various restrictions in the fluid tube. For example, flow rate to the head 2 is regulated such that an appropriate quantity of herbicide is dispensed to each region for spraying appropriately to intermediate weed group to be controlled.