The pilot was spraying a crop of peas on his own property, less than 500 metres from the strip. The aircraft was observed to finish the second swath run, but during the subsequent pull-up the left wing struck a branch of a 9 metre high tree. The aircraft veered to the left and collided with a large gum tree 235 metres further on. The aircraft came to rest inverted some 50 metres beyond this tree. A fire broke out and consumed much of the wreckage. No evidence was found of any pre-impact defect or malfunction of the aircraft which might have led to the development of the accident. The pilot was relatively inexperienced, was not qualified to conduct aerial agricultural operations, and had not received any formal training for such tasks. It was considered likely that he had mis-judged the distance from the tree struck by the left wing during the pull-up manoeuvre.