and I hate to burst yours, but it has been found effective for mites and THAT'S what I use it for.
"Diatomaceous earth is most effective on pests that are under constant moisture stress., which is the typical life situation of most house spiders and insects that wander in from outdoors. The idea is to spread a light layer of the dust in places where spiders or other insects are likely to walk or crawl. As long as it remains dry, DE will be effective indefinitely. " - Mother Earth News Dec 2010/Jan 2011
As for the Silicosis. I don't keep 100 chickens nor broilers. I also believer application is key. As I stated before to each his/her own. So far I have had NO problems nor mite infestations.
After having chickens for 5 yrs and being on this forum and taken out every book on poultry from the library, I've come to see there are many "experts". It's up to each of us to decide who to believe and what to do. I'll continue to waste my money on DE until I see the effectiveness other wise.
As for wormers, there are also many opinions on what is and is not effective. I'll continue to do what works for me and recommend it.
I wish you well,
Rancher