While on final approach, the pilot had the airplane lined up with the runway's extended centerline. The pilot reported that the approach was uneventful until the airplane encountered a dust devil which resulted in the airplane turning 90 degrees to the left. He attempted to turn the airplane back towards the runway but was unsuccessful. The airplane descended and impacted terrain short of the runway. A postaccident examination revealed substantial damage to the fuselage. The pilot reported no preaccident mechanical malfunctions or failures that would have precluded normal operation.