I'd not "double dose". I wait a few days before applying the permethrin, but that's just me. If they have access to dirt, they've probably already rolled in the dust and dirt anyhow. At this point, you may not be in control of the situation, as you are just a guest, so all you can do is recommend?
If you do have another bite at the apple, in 2 or 3 days, I'd go ahead with permethrin. Yes, the liquid is nice to use, but the dust shaker is easier for most folks to apply to the bird. I use a 2 gallon tank sprayer for spraying stuff like coop, roosts, etc, but I do not spray chickens.
If you do have another bite at the apple, in 2 or 3 days, I'd go ahead with permethrin. Yes, the liquid is nice to use, but the dust shaker is easier for most folks to apply to the bird. I use a 2 gallon tank sprayer for spraying stuff like coop, roosts, etc, but I do not spray chickens.