WITNESSES SAID THE AIRPLANE COMPLETED ITS THIRD SWATH RUN AND WAS FLYING SLOWLY AS IT APPROACHED SOME POWER LINES. THE AIRPLANE WAS SEEN TO PULL UP AND ENTER WHAT APPEARED TO WITNESSES TO BE A HAMMERHEAD STALL. THE LEFT WING DROPPED AND THE AIRPLANE IMPACTED THE GROUND AND CAUGHT FIRE. THIS WAS THE PILOT'S FIFTH SPRAYING JOB, AND HE HAD APPROXIMATELY 3 HOURS AS AN AERIAL APPLICATOR, ALL OF WHICH WAS IN THE AIRPLANE MAKE AND MODEL. HE HAD APPLIED FOR, BUT HAD NOT YET BEEN ISSUED, AN FAA AGRICULTURAL AIRCRAFT OPERATOR CERTIFICATE.