LOL, I think is may have been Diana who said that about the crop problems, not sure. And I dont know about that myself. I put some in the feed bags to kill any bugs in there and in the nests throughout the straw for the same reason. I used to put it in my feed at 2% of the total, but I have cut back on that some because of some studies I heard about.
One thing I wanted to bring up was something said by someone on another forum, that she was using DE in her coop on the floors and her Leghorns began having extreme bumblefoot problems that they hadn't before. When she quit using it, the bumblefoot issues subsided. That is the only time I have ever seen anyone equate DE and bumblefoot and I don't know if it could even have any validity, but I have had bumblefoot issues for a long time with several of my birds and nothing, I mean nothing, has ever helped, not surgery, not antibiotics, nothing. Because of what was said, I quit using it on the floors in the shavings to see if it helped any. The only reason I can see is that the birds walk and scratch in the DE and eventually, it wears at the pads of their feet, drying them out and making them more susceptible to abrasions.
Diana, would you comment on this? I'd like your input.