用 A Bit of Pesticide History Before W.W.II pesticides in common use throughout the US were predominantly inorganic materials,such as sulfur,lead, copper,arsenic,boron,mercury,as well as botanical compounds such as nicotine,pyrethrum and rotenone. A Bi f P i id Hi A Bit o f Pest i cide History Before W.W.II pesticides in common use throu ghout the US were predominantly inorganic materials , , such as sulfur , lead , copper, arsenic, boron, mercury, as well as botanical com pounds such as nicotine, pyrethrum and rotenone