Sorry I didn't get back, I thought I did!
Just curious, how did it go?
I don't even remember what all was going on at the time, but I was super overwhelmed, and despite wanting to wait and find out what happened in the name of science
I eventually also dusted with garden and poultry dust, for a few reasons.
1) I realized how long this could potentially draw out the amount of time that we would be tossing eggs, which isn't something that we could really financially afford. Paying for feed works because we pay less for human food in return, and I was not comfortable eating or feeding my family the ivermectin treated eggs, although many people do.
2) One chicken in particular developed a really severe case, she was still a young pullet, her little beard and muffs were just caked, and I didn't want my experiment to cost any lives.
3) I had too much going on, and I just needed to be done with what I could be done with as quickly as possible.
So I may try again in the future, and if I do, I will definitely post my results, but for now, I'm still unsure.
I can recall only one mite problem and that involved hens crammed into a chicken house. My free-range birds do not have enough mites on them to detect. Maybe might control can also involve changing how birds are kept.
I have 11 chickens in a 12 foot by 8 foot coop, with an 8 or 9 foot ceiling. Most the year round, the coop door (which is a large people door,) is wide open, allowing them access to an enclosed, secure run that is 12 foot by 16 footish. (I can't remember precisely off the top of my head, but about that long, within a foot or two either way.) The entire run is open, covered with hardware cloth. The run is only so they can get out of the coop if we are away, and so they can get out of the coop as early as they want any time before I get out there. I don't rise as early as the chickens.
Every morning I let them out to free range. My chicken free range all day every day that they want to. (Some days in Winter they would rather not!) Both short walls in the coop are also open almost completely for most of the year, they are hardware clothed, and we put panels over them only in the Winter, leaving a gap at the top for ventilation.
The point I am trying to make is that a mite infestation does not necessarily mean that you are cramming too many chickens into too little space, or that your chickens are not kept in good conditions. I care for my birds, and I think they are pretty well off, as chickens go. I keep their home clean. They have plenty of space, plenty of ventilation. The don't even use half of their roost.
You cannot assume that someone battling mites is a poor chicken keeper, that is unfair. After all, many wild birds have mites, and that is where your domesticated chickens are getting them from. Does that mean the wild birds are packing themselves too tightly in their nests?
Of course not. Free ranging, well kept bird can and
do get mites, too.