Hi- I heard Bruce Ames speak at one of the Midwest Farmer's markets, Abby Mandel used to put on at Ravinia, and I was not impressed with him. He gave a very negative view of organic farming, and gave people the impression that we would all starve, if farmer's did away with pesticides.
I also have problems with EWG's dirty dozen list they put out every year. They are strictly talking about California factory farms, which unfortunately supply Dominick's and Jewel with most of their produce. Factory farms use lots of pesticides, because it is difficult to raise produce with less pesticides, when you are doing it on a large scale. Some of the pesticides that are found on produce grown on factory farms, are not used by smaller farmers.
Peaches is always on their list of the dirty dozen, and yet a few years ago, the Chicago Tribune bought local peaches from Michigan at the farmer's market, and had them lab tested. The USDA lab that tested the peaches, found only two pesticides in the peaches, and neither of their concentrations came within even 10% of the tolerance allowed by the EPA.
Personally, I think that the conventionally grown fruit sold at the Chicago area farmer's market, contains a lot less pesticide than the fruit grown on factory farms in California. In Michigan it is almost impossible to grow peaches organically, partly because of problems with brown rot. It is not nearly as humid in peach growing areas of California, as it is here. Humidity causes brown rot. Hope this helps, Nancy