Question of the day: My husband is a bee- keeper and we have roughly 12 hives with about 60,000 bees in each one, give or take a few thousand lol. Anyway the bees love to drink from my chickens waterer and they love the chicken poo. I've heard everyone talking about 'dusting' their chickens for mites and I haven't noticed any on mine, but I don't dust them. I would rather prevent than treat an infestation. Because of the bees we have to be extremely careful not to use any poisons on our garden, trees, and yard. Would the stuff you use to dust your chickens be harmful for the bees also?
The "dust" normally used is Sevin (Carbaryl). There are web pages devoted to killing whole bee colonies using Sevin.
I would not use it if I was you. I found an article on using fireplace ash. http://naturalchickenkeeping.blogspot.com/2012/12/natural-way-to-rid-chickens-of-lice.html
I am not sure how effective it is.
Here is an info page http://anrcatalog.ucdavis.edu/pdf/8162.pdf