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An added benefit during fly season, it also controls the flies. Some cattle ear tags have permethrin to control the flies on cattle.

Not knowing where you live, if it's too cold out you can dust the birds. Wear appropriate clothing and make sure you get it under the wings well. Make them look like a powdered doughnut if you dust them. I had a severe infestation in the past. Permethrin works well. No more bugs.

I agree with Mary. I also put the dust in the nest boxes. Spray the coop inside thoroughly because it does not kill the pest eggs so repeated spraying is necessary. If you have a TSC they carry the permethrin powder, premixed spray bottles and the concentrate.