Organochlorides, such as Chlordane, certain organophosphates, and carbamates are especially harmful. On the other hand, most herbicides seem to be harmless, except where their use has greatly decreased the worm's food supply. No improved mineral content, no improved permeability, no improved beneficial organism count, and no improved fertility. On top of that, it kills all your earthworms. Earthworms are always working to make the soil better, not only for their own survival and reproduction, but also for the healthy survival of their primary food source, the residues from your crops.
Earthworms are truly the farmer's best friend.
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