During a local aerial application flight maneuver, the pilot was spraying milo and cleaning up the edge of the field when the airplane struck an electrical wire where the rudder and the vertical stabilizer meet at the leading edge and the wire cutters did not cut the wire. The upper bolt of the rudder was pulled out and the rudder was hanging by cables and the lower bolt. During the 15 mile flight to the airport, the rudder vibrated loose and separated from the aircraft. When the airplane was slowed for the landing/flare the pilot lost control of the airplane.