Which signal word indicates the least toxicity in pesticides?

The signal word that indicates the least toxicity in pesticides is "CAUTION!" This term is used to denote products that pose a lower risk compared to those labeled with other signal words. In the context of pesticide labeling, these classifications are based on the acute toxicity of the product, which is assessed through various tests that determine how harmful a substance is when it enters the body through ingestion, inhalation, or skin absorption.

"CAUTION!" signifies that the pesticide may still cause harm if misused, but it is less toxic than those labeled with "WARNING!" or "DANGER!" The latter signal words indicate more hazardous products, with "DANGER!" representing the highest toxicity level. Understanding these signal words is crucial for safe handling and application of pesticides, as it helps users gauge the precautions needed while using different products.

In summary, "CAUTION!" indicates the lowest level of toxicity, making it essential for users to prioritize safety measures based on the signal word presented on pesticide labels.