Fish and Wildlife Service Clears a Weedkiller, Saying It Wonβt Cause Extinction NYT - Energy & Environment By: Hiroko Tabuchi 20 May 2026 at 17:04 The finding effectively paves the way for continued use of atrazine, a widely used herbicide that has been linked to birth defects and cancer in humans. Β© Julie Ingwersen/ReutersTest plots at a Syngenta research site in Junction City, Kan. Atrazine is made primarily by Syngenta.