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They are made of arsenical bronze, a mix of arsenic and copper that predates tin bronze and almost certainly shortened the lives of the people who worked with it.

“Anyone who has watched the dusters and sprayers of arsenical insecticides at work must have been impressed by the almost supreme carelessness with which these poisonous substances are dispensed.”

These conditions may easily be duplicated as a result of heavy applications of arsenical insecticides.

Only then did the government begin canceling some of the registrations of arsenical pesticides.

A statement from the industry group USA Rice Federation said that U.S. rice growers do not use arsenical pesticides.