Abstract: A device for controlling the binding of bales of material such as straw or fodder formed on an agricultural baling press fitted with a binding system, in which the loop of a binding material is made around the bale progressively during compression of the material, wherein a motor member cooperates with a second finger in order to return it from its retracted position to its active position, in response to the raising of a first finger by the binding material, and wherein a signal emitter is adapted to be energized in function of the rotation of the axle under the effect of the movement of the second finger, in such a manner as to indicate the absence or the rupture of the binding material during formation and knotting of the binding loop.