text:  Bug picking and weeding is not something the Polks do all by hand. They sometimes use naturally derived pesticides approved for organic farming. For weeding, one method is to plow with a tractor to uproot the weeds, what David Polk calls steel in the field. But either way, the Polks know some of their crops will succumb to bugs or weeds or disease. You end up having to plant often more to produce the same volume of harvest as a conventional farm would.