A Little Less Green?

Studies challenge the benign image of pyrethroid insecticides

Rachel Carson turned the pest-control world upside down in 1962. In Silent Spring (Mariner), she documented how long-lived organochlorine pesticides, most notoriously DDT, were not only ridding croplands of insects, streets of mosquitoes, and homes of spiders but also exacting a high toll on songbirds and other nontargeted species.