pesticide

torjunta-aine, tuholaismyrkky Anything, especially a synthetic substance but also any substance (e.g. sulfur), or virus, bacterium, or other organism, which kills or suppresses the activities of pests.
2011, Allan S. Felsot, Pesticides and Health: Myths vs. Realities, page 4:

Pesticide and fertilizer use has been recorded since ancient times, (..)

Diluted neem oil can be effective as a pesticide and can control various fungal diseases, such as powdery mildew, on animals and plants.