History of Pesticides
The practice of minimizing or eradicating the effect of pests on one's harvest is thousands of years old. This is evident with the ancient Sumerians, who about 4500 years ago used sulfur compounds to kill insects. Chinese farmers as much as 2300 years ago began timing their crop harvests to avoid periodic influxes of pests. In other areas, such as Europe, by the 1600s, substances such as nicotine and arsenic were used for elimination of crop predators. [1]