Which signal word indicates the highest level of risk on a pesticide label?

The signal word that indicates the highest level of risk on a pesticide label is "Danger." This term is used to communicate that the product poses a significant risk of causing harm through skin contact, inhalation, or ingestion, and emphasizes that immediate actions should be taken to prevent exposure.

In pesticide terms, the signal words are part of a hierarchy intended to inform users about the potential hazards associated with using a product. "Caution" and "Warning" are used for lower levels of risk; "Caution" indicates a relatively low potential for harm, while "Warning" suggests a moderate degree of hazard. "Notice," on the other hand, is not a signal word associated with toxicological risk; rather, it typically pertains to general information or usage guidelines.

Thus, "Danger" is clearly the most critical signal word, as it denotes that the pesticide is likely to be harmful under normal use and should be handled with the utmost care. Understanding these signal words helps ensure that users apply the products safely and effectively while being fully aware of the associated risks.