by Larry Powell The European Food Safety Agency (EFSA), a branch of the European Union, has declared that chlorothalonil "may cause cancer in humans." Several of the agency's findings were based on tests with lab rats. But it obviously believes their metabolisms are sufficiently similar to ours to place chlorothalonil in "carcinogenicity category 1B - may cause cancer in humans." Chlorothalonil is the active ingredient in several agricultural fungicides used to treat mildew, blight and mold in many crops. According to the newspaper, The Guardian, it is the most widely-used pesticide in all of the UK and the the most popular fungicide in the U.S. It's been used, worldwide, since the '60s. A project based at Simon Fraser University, CAREX, reports that 581 tonnes of chlorothalonil were sold in BC alone in 2010 and 1,121 ton