We can not recommend enough reading:
Dietary pesticides (99.99 all natural), by Bruce Ames, Margie Profet, Lois Swirksy Gold, Proc Natl Acad Sci USA, vol 87, pp. 7777-7781, October 1990
I translate the abstract:
The toxicological significance of exposure to synthetic compounds is explored in the context of exposures to naturally occurring compounds. We calculated that 99.99% (by mass) of pesticides in the diet of Americans are compounds produced by plants to defend themselves. Only 52 natural pesticides have been tested in animal models, and about half (27) are rodent carcinogens; these 27 compounds are present in many foods. We conclude that natural and synthetic compounds have the same probability of being carcinogenic, according testing. We conclude also that at low doses at which they occur in humans, the risks of synthetic pesticide residues are insignificant compared to the risks associated with natural pesticides.
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