Child, who is in his third season as a Super League referee, awarded 27 penalties during the game, as well as dismissing Hull FC player Sean Long and sin-binning Lee Radford.
It was also an unhappy red-letter day for Nathan Hines, the lock winning his 50th cap but earning an early sin-binning for a swipe at Wales full-back Lee Byrne.
Overworked Ganson soon lost his patience with the players' misdemeanours and sent Bradford's Ben Jefferies to the sin-bin for persistent holding before doing the same to Lee Radford for a niggling foul.