A .22 calibre rifle works well... Pretty quiet and quick... even in a residential zone... How do I know? My neighbour, a retired OPP officer, approached me one day and said there was a rabbit that was getting into his garden and asked if I minded if he "took care of it". I had no problem with it, and about 15 minutes later I see him and my other neighbour (retired Military Police) skirting the edge of his garage with his .22. The MP says to him "Here, let me try..." and takes the gun, kneels down, and sifts a shot over the rabbits head...and into an adjoining neighbours back yard... rabbit doesn't even budge an inch... shoots again and nails it in the neck and kills it... Oh yeah, the rabbit at the time was in MY garden...lol...
Moral of the story... use whatever means necessary to kill the Earth Pigs and keep them from your crop... It's gonna be an interesting summer when I put my 4 legal plants outside for the neighbours to gossip about...lol
p.s. Rodents and gardens do not mix