I have found, that the only time we have a mite problem, is deep winter, and experience will tell you, the birds are often huddled in the coop, and there is mud or hardpan everywhere, no dust bath to be had.
Easy pickings for MrMite to move in.
On letting my birds free range, I watched them, and under the house they went.
I could hear them kicking up sand & pebbles under the floor !
I went with a flash light to inspect the noise..and there they were, in a haze of dust, kicking upp dirt and bathing in a scene not unlike the moon's surface, they had several holes,and were going at it.
So...I got them dust bath pans, and they come out of the coop with dust all over them looking like chickens on fire !!
they love it.
I love the fact that I no longer have to dust them or apply anything to them, they will take care of themselves if provided the essentials to do so.
Here is Western Washington, we have so much rain, and everything is muddy for so long, and that is mite season.
Birds provided with what they need to survive & be healthy & happy, do so.
I have to sift the shavings out once a week or so, but not a high price to pay for healthy and very happy birds.
I have a picture somewhere of the Blue Copper Marans coop, with 3 hens in the dust bath at once, and boy is it ever dusty!!
But they like it, alot.
Edited to add: Heck, our forefathers knew about dust bathing, they all wore powdered wigs!!
The head lice problem with our grade school kids going to school every fall is also a good example..kids are huddled, indoors, wearing hats & scarves, and presto!
Right here in this time zone, we humans STILL have a head louse problem, every fall, in elementary school chicldren.
Where do these bugs come from ?
No one knows but they show up every fall.
Maybe we should dust bathe also