What is a signal word on a pesticide label indicative of high toxicity?

The signal word "Danger" or "Poison" on a pesticide label indicates a high level of toxicity. This designation is used to inform users that the pesticide poses a serious risk if mishandled or improperly applied. It suggests that exposure to even a small amount of the product can lead to severe health effects or even death.

In the context of pesticide regulations and safety, labels are designed to convey essential information quickly. The use of strong signal words like "Danger" or "Poison" immediately alerts users to the seriousness of the substance they are handling. Understanding these signal words is crucial for ensuring safety and minimizing the risk of harmful exposures when using chemical products.

Other terms like "Warning" indicate moderate toxicity, while "Caution" signifies low toxicity, meaning that those products can generally be handled with less stringent safety measures. "Risk" is a term that does not function as an established signal word in the same context and does not offer clear guidance on the toxicity level of a pesticide. Thus, "Danger" or "Poison" is the most authoritative indicator of high toxicity among the choices provided.