The present invention concerns an apparatus for the mechanized displacement of movable wires (F) arranged on opposite sides of a row of plants, in particular grapevines, and the process of operation of said apparatus. An apparatus according to the invention comprises a frame (1, 301) suitable to be removably mounted on a farm vehicle, said frame (1, 301) being provided with means (14, 14, 314) for moving said movable wires (F). The apparatus is characterized in that said moving means (14, 114, 314) include a pair of opposite gripping elements (15, 115, 315), each of which being suitable to slidingly receive one of said movable wires (F), said gripping elements (15, 115, 315) being movable in a sequential and synchronized manner along at least two orthogonal axes so as to displace said movable wires (F) from a first height to a second height.
