The pilot reported that he was to spray a 17 acre crop of cucumbers. He had flown the area twice previously, and knew the hazards to be powerlines and stay wires from the power poles. The stay wires were the more difficult to see so he concentrated on locating these during his aerial inspection of the paddock. At the completion of his first run, which was along the western edge of the area, there were two sets of powerlines. The pilot had planned to fly under both sets but hit the second set as he pulled up from the run. He stated that he had forgotten about the second set of wires. Although the aircraft sustained left wing and aileron damage, the pilot was able to land safely at the operating landing area.
