Abstract: There is described an implement for the harvesting of seed-producing plants which is suitable for use with mechanical harvesters and is formed of a chassis which comprises basically a hollow front transverse beam and a structure defined by lateral, base and rear parts and a structure which includes a mesh-covered portion; at least two quill-defining trays arranged at an angle with respect to the horizontal, one alongside the other and with their quills pointing in the direction of advance, they being directly connected in front of the front beam; defining between said trays at least one access passage to a cutting station; a cutting station at the end of each passage and arranged slightly to the rear of the trays on the front beam; on which there is provided a high-speed cutting disk which partially overlaps the respective passage; there being provided, in the vicinity of each cutting station and also borne by the front beam a stalk-impelling mechanism adapted to bring, by impeller elements arranged to move o