- Sep 7, 2008
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Sevin is fine. However it is quite short-term. Pyrethrins are just as safe, and they have a longer residual effect. You can get pytethrins in powder form at farm supply stores. I woud use either the sevin or the pyrethrin dust to dust the chickens, and get some liquid pyrethrins to mix with water and spray the roosts, nests, floor, walls, etc. This will kill most of the mites for a long time.