During the sortie the student overcontrolled the aircraft during the landings. Conditions were hot and humid with slight turbulence. On the fourth landing the aircraft bounced, the right wing dropped and the aircraft veered to the right. The instructor took over the controls and applied full power. She was able to regain straight and level flight but did not correct the veer because the airspeed was low and because she was confident that the aircraft would safely clear a fence ahead. The aircraft failed to gain sufficient height and the gear collided with the fence. The aircraft settled into an isolated pile of rubble a short distance beyond the fence. This accident was not the subject of a formal on-site investigation.