Aircraft sustained fuel management problems (misidentified as a mechanical issue) during a low-level spraying flight out of Sussex, NB and attempted a wheels-up forced landing on McLaughlan Road / Highway 126 north of Moncton, NB, Canada. A wingtip struck a telephone pole and the aircraft swerved off the road into a field, sustaining significant damage. Normally prior to spraying a block there was a radio call for "spray check" at which time a full wing tank was selected and revs increased among other items. Pilot missed this call due to radio malfunction. The fuselage was trucked out the previous day. Pilot was unhurt.