Agricultural implement for automatically detecting and treating weeds covering an agricultural land surface, having: - a plurality of individual temporarily activatable weed control devices (2, 2-1, 2-2, 2-3) for treating weeds in a respective widthwise section (B1, B2, B3) of an entire working width of the agricultural implement defined by the widthwise sections, wherein at least one, preferably precisely one, of the weed control devices (2, 2-1, 2-2, 2-3) is assigned to a respective widthwise section (B1, B2, B3), - at least one light emitting unit for emitting visible, in particular white, light in the direction of the agricultural land surface over the entire working width, - a plurality of light-sensitive colour sensors (3, 3-1, 3-2, 3-3) for detecting the light reflected in the widthwise sections (B1, B2, B3) and previously emitted by the at least one light emitting unit and for measuring real colour values of the detected visible light, wherein at least one, preferably precisely one, of the colour sensors (3, 3-1, 3-2, 3-3) is assigned to a respective widthwise section (B1, B2, B3); and - an evaluation unit, which is designed to process the measured real colour values, in order to detect weeds at least partially covering the agricultural land surface in the working width, and to individually temporarily activate a respective weed control device (2, 2-1, 2-2, 2- 3), in the assigned widthwise section (B1, B2, B3) of which at least one weed has been detected, characterised in that the agricultural implement has a plurality of evaluation units (4, 4-1, 4-2, 4-3) for processing the measured real colour values, wherein precisely one respective separate evaluation unit (4, 4- 1, 4-2, 4-3) is provided for a respective widthwise section (B1, B2, B3) and is assigned to this widthwise section (B1, B2, B3), and is designed, on the basis of the real colour values measured in this widthwise section (B1, B2, B3) to detect weeds of a predetermined weed species, in particular volunteer potato plants, and, as a temporarily applicable activation criterion for the weed control device (2, 2-1, 2-2, 2-3) assigned to this widthwise section (B1, B2, B3), to determine whether the widthwise section (B1, B2, B3) of the respective weed control device (2, 2-1, 2-2, 2-3), at a particular detection time and/or during the detection period of a predetermined duration and/or a predetermined movement range of the implement, is covered with at least a predetermined minimum degree of coverage by the predetermined weed species, wherein the predetermined minimum degree of coverage is at least 30%, preferably at least 40%, most preferably at least 50%, of the respective widthwise section (B1, B2, B3), and to only temporarily activate the weed control device (2, 2-1, 2-2, 2-3) assigned to the widthwise section (B1, B2, B3) for, in particular thermal, targeted treatment of detected weeds of the predetermined weed species, on condition that the determined activation criterion for this widthwise section (B1, B2, B3) is valid. - a plurality of individual temporarily activatable weed control devices (2, 2-1, 2-2, 2-3) for treating weeds in a respective widthwise section (B1, B2, B3) of an entire working width of the agricultural implement defined by the widthwise sections, wherein at least one, preferably precisely one, of the weed control devices (2, 2-1, 2-2, 2-3) is assigned to a respective widthwise section (B1, B2, B3), - at least one light emitting unit for emitting visible, in particular white, light in the direction of the agricultural land surface over the entire working width, - a plurality of light-sensitive colour sensors (3, 3-1, 3-2, 3-3) for detecting the light reflected in the widthwise sections (B1, B2, B3) and previously emitted by the at least one light emitting unit and for measuring real colour values of the detected visible light, wherein at least one, preferably precisely one, of the colour sensors (3, 3-1, 3-2, 3-3) is assigned to a respective widthwise section (B1, B2, B3); and - an evaluation unit, which is designed to process the measured real colour values, in order to detect weeds at least partially covering the agricultural land surface in the working width, and to individually temporarily activate a respective weed control device (2, 2-1, 2-2, 2- 3), in the assigned widthwise section (B1, B2, B3) of which at least one weed has been detected,