When was DDT made?

1873/1874 is the date of DDT's (dichlorodiphenyltrichloroethane) first known making.

Specifically, Austrian chemist Othmar Zeidler (1859-1911) is credited with DDT's first known synthesis. The achievement occurred under the supervision of German chemist Johann Friedrich Wilhelm Adolf von Bayer (1835-1917). Swiss scientist Paul Hermann Müller (1899-1965) received the 1948 Nobel Prize in Medicine and Physiology for recognizing DDT's efficacy as an insecticide and thereby supplying controls against such insect-transmitted diseases as malaria and yellow fever.