An automatic control device for controlling the placement of wrap material on a bale within a round baler. A pair of twine guide tubes are actuated for movement by an actuator which is energized by a controller for controlling a twine wrapping operation. Separate twine strands are fed to each of the twine guide tubes and the quantity of twine fed through the guide tubes is monitored by sensor pulleys which send a pulsed signal to the controller. The controller controls the location of the twine guide tubes in response to the sensed signal from the sensing pulleys whereby a predetermined quantity of twine is placed at predetermined locations along the bale.