Which signal word indicates a pesticide is highly toxic?

The term that indicates a pesticide is highly toxic is "Danger." This signal word is used to convey a significant level of hazard associated with the product. Items labeled with "Danger" are typically associated with a high acute toxicity risk, meaning that even small exposures can lead to serious health effects or fatalities. This categorization is critical for users and handlers to understand the potential dangers they face when working with such pesticides, ensuring they take the necessary precautions to protect themselves.

In contrast, the other signal words have specific meanings that convey different levels of toxicity. "Caution" indicates a low level of toxicity and poses less immediate risk, while "Warning" signifies that a pesticide is moderately toxic. The use of "Alert" is not standard in the classification of pesticide toxicity; therefore, in this context, it does not communicate a recognized level of hazard like the other terms. Understanding these classifications helps ensure safe handling and application of pesticides based on their toxicity levels.