Hi! I'm as nooby-new as they come -- just in the process of considering 3 or 4 backyard hens as pets/layers and reading all I can.
This thread on diatomaceous earth is fascinating! I just wanted to post an updated link for the Kansas State University research article on DE originally posted by dlhunicorn back on 5/9/07:
http://www.ksre.ksu.edu/grsc_subi/T...ure_slides/GRSC651_lect_20(1)_Inert_Dusts.pdf
I would just like to note that KSU is an agricultural and veterinary land-grant university, and is therefore "mom" to all of Kansas's county extension offices. In other words, they're not some fly-by-night operation! ;-) The article is no older than the year 2000, at the oldest, as several of the sources the authors cite are from 2000. BTW, the information on DE specifically doesn't start until page 5, so you need to scroll down a ways to get to it. And there's lots of scientific jargon to sift through -- whew!
It was interesting to read that DE is widely used to keep insects out of grain storage buildings (i.e., the grain elevators all over Kansas that much of our flour ultimately comes from). And that the fossilized algae that make up DE is, indeed, silica, but NOT the crystalline form of silica that's a carcinogen, thank goodness. DE's silica is something called "amorphous silica" and is considered by the FDA to be safe to use in and around food and food preparation areas, so, yay!
IMHO, breathing in any kind of dust isn't great for your lungs (heck, I wear a dust mask when I scoop out the cats' litter boxes!) but the article did say (somewhere down near the end -- it's a looong article) that no link between DE and lung cancer has been found. I hope this eases your concern, MAXXX.
The article also mentions that DE's effectiveness decreases markedly when in wet or humid environments, which makes me think it would probably lose its insect-killing properties in a compost heap. But I think if I kept bees, I'd keep the DE away from the bees' haunts, because it would theoretically work on them as on any insect.
Sorry for the long post -- I hope I'm not being too presumptious as a newby in trying to "clear the dust" ;-) on this topic! I look forward to learning all I can from all of you! I'm still in the FAQs section -- BTW, the double-yolk chick thread was superb.
Your Kansas-dwelling (could you tell? ;-) hopefully future chicken-keeper,
Greta