So I am sure I am going to get alot of different answers here, but I am trying to decide if I should start culling old brood frames or not. I use all deep one piece pierco plastic frames for my brood boxes. Most are only two or three years old and I have not used any chemicals in the hives expet for Apiguard once three years ago in two hives. That is it. Is it really necessary to cull untreated frames or should I just leave them alone. If I do use Apiguard once a year does that change the situation as I am trying to use as few chemicals as possible. So what are your thoughts on culling?