Comment Re:Pesticides for humans (Score 4, Informative) 224
Your recollection does not align with history. DDT was far from the first significant agricultural pesticide.
In the real world, pesticides and specifically insecticides date back thousands of years. Sulfur was burned to produce a noxious gas, and various naturally occurring substances, biological and mineral, were gathered and used. Hydrogen cyanide gas was used to fumigate citrus trees in California in the 1880s. Zyklon A, which was a compound designed to release hydrogen cyanide on the application of heat and water for pesticidal purposes, dates back to before WW1. It was banned after a similar compound was used as a chemical weapon in WW1.
Zyklon-B was a cyanide-based pesticide with an irritant additive to serve as a warning, dating back to the early 1920s. It was used for delousing clothes and controlling pests in ships, warehouses and trains. It was co-opted for more infamous purposes later. One of the inventors was executed in 1946 for knowingly providing the substance to a certain evil state actor.
Organophosphates were used as pesticides, followed shortly by use as nerve "gases".