Your mite problem has inspired me to get out the wood ash again. I've also been lax. Kind of dumb as it would be much more needed in summer than winter so I don't know what I was thinking.
I had let my indoor litter get a little "stronger" of an ammonia build-up the last week or 2. Not as in "bad for the birds", as there is a lot of air flow in there during the summer and you couldn't smell it until I dug down. I did this purposely as I was experimenting with different amounts of carbon input (pine shavings) to see how much is really needed to keep that balance.
Now I know that everyone is afraid of ammonia (and for good reason under certain circumstances) but after having read that it was a nominal amount of ammonia in the deep litter that helps keep cocci down for new chicks in the brooder, it stands to reason to me that it would also help keep bad bugs like mites down too.
Last weekend I took out a good amount of the stronger litter, added more pine shavings, and a LAB mixture from a commercial source right under the roost. I want to experiment and see what those LABs do in the litter. Will report later.
But...
All of that was to say that I'm thinking that that little extra ammonia has probably kept some of the mite/lice issues at check.
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I have noticed that the wild birds have discovered my chicken area this year. Especially the robins. Early in the morning and late in the evening before the door opens for the chickens and after they are at roost, the robins were filling the outdoor run. Since I have the deep mulch in there, it is a prime place to dig for worms and what-not. Those birds would actually stand around in the evening just outside the run part waiting for the chickens to go in so they could have at it.
I finally put the bird netting over the whole side of the dog kennel run from which they were entering. They would come right through the chain link and in until I covered it with the bird netting.
Besides stealing the worms, I'm sure they bring mites, lice and who-knows-what with them so I wanted to keep them out. Netting has worked well.