Putting electricity to the ground bring worms to the surface. Search for Worm Shocker or Worm Tazer.
Zap em to bring them up and then fry them with the flamer.
Hmmm, I wonder how moles react to electrified ground? Zap ‘em to bring them up and then shoot ‘em with a pellet gun?
Would be like the shooting game at the carnival.