The johnson's stuff says it's strictly just Diatomaceous Earth and there's nothing added. However, I checked the coop over as well as the chickens really well and saw no bugs! I checked the roost pole and noticed that in the spot where they sit, the wood is very soft, (They have their spot and they huddle together at night), almost like it's dry rotting. Maybe they know, and are fearful it may break. Unfortunately my husband will have to fix the post so I'll have to wait till Saturday to fix it.
Could this be the reason?
Here is a consideration .... as your birds get older they get heavier so something that was comfortable to roost on may become less than comfortable. By changing the roost from round to flat you kill two potential problems with one stone.... if the original roost is getting soft they may not feel secure there.... and flat roosts are easier for them to relax their toes and sleep.
Make sure the roost is higher than the nests too. To change the habit cover the nest boxes in the evening so they cant sleep in them.
One thing about mites is what ever it is you use to eradicate them has to be followed up with a second dose... Because the life cycle of mites is seven to nine days you need to treat every one again after about a week. the instructions should have had a repeat time on it.
The other thing is... DE in my opinion is a good fortification.... but if your infestation is or was heavy I would bring out the big guns and use something and completely strip that coop toss the bedding and treat the coop and chickens at the same time.... As well as their run and any wood crevice or crack.
Life cycle of Mites
http://ipm.ncsu.edu/AG369/notes/poultry_mites.html
A better write up on mites and the treatment. Not all Mites hide during the day
http://www.ksre.ksu.edu/bookstore/pubs/MF2387.pdf
I would either use Orange OIl spray or Neem oil on the coop and outside areas. those are natural if you are going organic... I am not concerned about being organic so I would spray with pyrethrins... which can be used on dogs and livestock too if necessary. Believe it or not pyrethrins have been around for a long time and are organic as well.... they orignally came from wild Chrysanthemums.... I just found this out through the research to answer your questions.
The DE is a good fortification... But I worry about the dust being inhaled.... by people and by livestock.... And even though its noted to be safe if you take a look at DE under a microscope its made of very sharp shells of sea creatures. Which is why it works against insects and why its recommended to use it with a face mask. Those shells came from an ancient sea and do not dissolve or soften in water....
Some people use fireplace ashes to put in the dust bath area. Fireplace ashes are mildly caustic and do a good job to let the birds take care of the occasional mite on their own. (ashes are where the pioneers got their Lye)
I would prefer to have a chemical on hand to deal with the issue because Mite infestation can come from anywhere... Wild birds can bring it in for one. My mite infestation came in when I bought a small flock from a local guy.
Also I paint my perches when I have an enclosed aviary or coop. It serves two functions. Lets you know when they are getting really dirty but it also fills any nooks and crannies. I used to decorate my Finch and Parakeet aviary perches with painted on flowers... LOL Nest boxes too... there is such a thing as mite paint for perches.
so in a nutshell My favs
for the coop and out lying areas they can be used in your garden too.
Orange oil -
can be found at Ace Hardware
Neem oil -
can be found at Amazon
for the birds themselves
Pyrithins -
can be found at Amazon as well
http://animals.pawnation.com/mite-lice-spray-birds-11026.html
deb