Harvesting device

An agricultural machine with an implement for working a row culture of working rows arranged parallel to one another, interference rows arranged at an angle to the working rows or both includes at least one controllably moveably working section with activatable working devices for working the row culture. The implement has a control unit for controlling the working section and working device relative to a working row and an optical sensor unit connected to the control unit for generating an image of at least part of the row culture, from which a sensor signal (S) is generated for controlling the controllably working section, working device or both. The control unit evaluates a validity of the sensor signal (S) to determine whether the sensor signal (S) is used for controlling the working section or working device based on at least one evaluation parameter.