Has anyone used camphor, the kind of thing that apparently kills cloths moths, to kill weevils in wheat bins ? how have you found it and does it effect the chickens in your experience ? Are there factual studies to say if camphor is nontoxic or problematic and if it effects food. I have been trying out different things in the fed bins, lack of oxygen to kill them using candles, it annoys the weevils and brings them to the top but doesn't mop up enough oxygen to kill the pests. Also an open bottle of methelated spirits, has a similar effect, and not successful. camphor at the moment looks interesting, they seem to fall down right under it, so probably could be used as a trap of some kind. It has a stronger effect than the others. Apart from these methods, I'm just going to consider nuking the lot by bagging it into plastic and putting it a few days in the freezer which can't hurt it at all. Was looking for someone who has experience and success, please put speculation elsewhere.