Developmental toxicity of two common corn pesticides to the endangered southern bell frog (Litoria raniformis)

► The effect of terbufos sulfone and atrazine on larval growth and development was investigated. ► Terbufos sulfone alone significantly slowed development and delayed metamorphosis of tadpoles. ► Atrazine had no observable effects alone nor did it interact synergistically with terbufos sulfone. ► The developmental effects indicates a risk to endangered southern bell frogs in the irrigation area. ► The results highlight the toxicological importance of some pesticide breakdown products.