What signal word indicates a highly toxic pesticide?

The signal word that indicates a highly toxic pesticide is "Danger-Poison." This designation is used to alert users to significant health hazards associated with the pesticide. Specifically, "Danger" implies that the product presents an immediate risk to health or the environment, and when combined with "Poison," it communicates a very high level of toxicity. Products marked with this signal word could be fatal if ingested, inhaled, or absorbed through the skin, necessitating strict precautions when handling such substances.

In contrast, the other signal words— "Warning" and "Caution"—indicate lower levels of toxicity and associated risks. "Warning" denotes moderate toxicity, while "Caution" is used for products that are less toxic and may pose minimal hazards. The term "Hazard" is not a specific signal word recognized by the pesticide labeling system and does not directly communicate the level of toxicity. Therefore, "Danger-Poison" is the appropriate choice to represent highly toxic pesticides.