When the farm down the road was just a crop farm, the rats here were BAD! They had those big plastic tubes full of feed, corn, oats, and all manner of other stuff all over the place. The rats came in mass. Even though the farm is half a mile down the road, we still got visited quite a bit, especially in fall.
We used to use a thing kind of like a minnow trap. You got a 5 gallon bucket with a lid and drilled a 1" or 1.5" hole in the middle of the lid. Open the top up and put some rat poison in it along with a handful of sweetfeed(for smell). The rats LOVE it. Then just leave it in the garage or wherever. The rats will jump on top and wiggle their way down through the hole. But then, they can't get back up through the little opening. They eat the poison and croak. I like this because we have dogs who love to run off and dig up woodchucks or whatever and bring them back to chew on. They'd think nothing of eating a poisoned rat they found laying on the lawn.
We used to use a thing kind of like a minnow trap. You got a 5 gallon bucket with a lid and drilled a 1" or 1.5" hole in the middle of the lid. Open the top up and put some rat poison in it along with a handful of sweetfeed(for smell). The rats LOVE it. Then just leave it in the garage or wherever. The rats will jump on top and wiggle their way down through the hole. But then, they can't get back up through the little opening. They eat the poison and croak. I like this because we have dogs who love to run off and dig up woodchucks or whatever and bring them back to chew on. They'd think nothing of eating a poisoned rat they found laying on the lawn.