Insecticide

An insecticide was a was a type of pesticide, or poison, specifically against insects.

One insecticide was DN6, which was created by Forester, who was also concerned about its effects and impact on the environment, including being deadly to bees, if it went into production. (TV: Planet of Giants)

Piperine, which was an active ingredient in pepper, was often used as an insecticide. (TV: The Unicorn and the Wasp)