Abstract: A cutting and threshing header for attachment to an agricultural vehicle for use in harvesting standing crops. The header comprises cutters for cutting crop material including seeds or grains and varying lengths of stalk, said cutting means extending over substantially the full width of the header. Threshing stages within the header also extend over a width substantially equal to the width of the cutting means. The threshing means comprises a curved mesh surface extending over the full width of the threshing means and a rotor co-operating with said mesh surface to urge the cut crop material through an annular space between the rotor and the mesh, thereby causing separation of said cut crop material into seeds or grains, which pass through said mesh for collection, and waste material including said varying lengths of stalk, which is discharged from the threshing means over substantially the full width thereof.