What signal word on a pesticide label indicates the highest level of toxicity?

The signal word on a pesticide label that indicates the highest level of toxicity is "Danger." This term is used to warn users that the product poses a significant risk if handled improperly, ingested, or if it comes into contact with the skin or eyes. The placement of this word on the label serves as a critical safety measure, alerting users to take extreme caution when using the product.

In understanding toxicity levels, "Danger" is typically used for substances that can cause severe harm or even fatality, while the other signal words represent lower categories of toxicity. "Warning" indicates a moderate level of toxicity, and "Caution" suggests a relatively low level of harm. The term "Alert" is not a standard signal word used on pesticide labels in this context. Recognizing the differences among these signal words is crucial for safe pesticide handling and application practices.