You need a cat. I don't own one but there are three in our area that love the orchard and berry patches. I get upset when they get a bird, but I haven't seen a mouse or vole in a very long time.

an outside cat or cats. housepet cats are too spoiled and often do not hunt at all.

give them good shelter (I use a rubbermaid tub with a blanket and pet heater) and a modest amount of food and you will regularly see them with rodents in their mouth. if they really like you sometimes they'll leave the dead rodents on your porch as a present.

You can try different kinds of traps such as zappers but trapping should work if you are persistent. Some years it can be very difficult, but if you have to set 50 traps or more, so be it. I am about to order plastic traps from Gemplers which I set with peanuts or almonds under large trays (the kind used for mixing small batches of concrete). I protect about 3 acres of nursery this way with good success. I'll be moving around 10 trays and 40 traps until the first heavy snow.

I use aluminophosphid tablets; I don't know if that is actually organic or not, but it sure drives the little buggers away.

Johnmerr, what are those tablets? I tried googling them , but what came up was PHd lingo on catalytic seives.

My cat keeps all the rodents at bay.