Which precautionary signal word indicates that a pesticide is least hazardous?

The precautionary signal word that indicates a pesticide is least hazardous is "Caution." This terminology is part of the system established by regulatory agencies to inform users about the potential risks associated with pesticide products. The signal word "Caution" is used for products that pose a low level of toxicity, implying that while safety precautions should still be followed, the risks are significantly lower compared to those indicated by the other signal words.

In contrast, the word "Warning" indicates a moderate level of hazard, suggesting that the pesticide can cause more serious effects and requires more careful handling than those labeled with "Caution." The signal word "Danger" denotes the highest level of toxicity, often associated with substances that can cause severe harm even with minimal exposure. Lastly, "Risk" is not a standard signal word in the labeling system; it's a general term that refers to the potential for harm but does not specifically classify toxicity levels in the same way as the others.

Understanding these terms helps users assess the safety measures necessary when handling pesticides and reinforces the importance of proper labeling in ensuring user safety.