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Q&A Home

Steven from Hoboken, N.j. writes,

Do Mice Build a Resistance to the poison in Place Packs and or Bait Blocks?

It seems like an annual occurrence where the mice come back every year when the weather gets cold. This time, I am having a very difficult time. They are ignoring the packets, they are wary of the traps. I used different traps with cereal as bait held in place with peanut butter. Also used an electronic trap. Got 8 in traps so far. And 2 bait blocks are being eaten. The ones caught in traps were small maybe juveniles and there are 2 different size droppings. I think the Mommy and Daddy are teaching the kids what to avoid.


There are some instances when rodents can be resistant to a certain active ingredient in a bait and there may be instances where the rodents will avoid the bait all together (bait is old or spoiled, too many alternate food sources are available). We recommend changing to a bait with a different active ingredient so that you will have fresh bait and you can avoid any issues with resistance. We also recommend you inspect your home very carefully and seal up any holes you can so you can exclude the mice from entering your home in the future. You should also purchase tamper resistant bait stations (with a high quality bait) to use around the perimeter of your home so you can eliminate the mice outdoors before they have a chance to look for a way in. Please take a moment to read our article Rodent Proofing for Fall to learn more about excluding rodents from your home.

Answer last updated on: 12/15/2011

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