Does that make a difference? I'm not really familiar with organic gardening, although I do know a little bit from my Behind the Seeds tour I've taken (a few times) at The Land, in Epcot. They do something called integrated pest management, and they try different types of flies, etc. to combat certain bugs. This saves some of the plants from being sprayed with pesticide.
I could see that working well in a smaller food growing operation, but in the larger growing areas, I would think that would be harder to use with success. I mean, they'd have to get huge amounts of flys, etc., to cover such a large area, right? Or, in your case, do you just buy from smaller, local organic farms?