Which signal word must be present on the label for pesticides identified as "Slightly toxic"?

The signal word that must be present on the label for pesticides classified as "Slightly toxic" is "Caution!" This term indicates that the substance poses a lower risk of harm compared to those categorized as moderately or highly toxic. The use of "Caution!" reflects the level of toxicity and potential health effects associated with exposure to the pesticide, ensuring that users are aware of the need for safe handling and application practices.

Pesticide labels are designed to communicate the relative hazards of the chemicals they contain, which helps users make informed decisions regarding their use. "Caution!" serves as an important warning that, while the pesticide should be treated with respect, it is generally less hazardous than those labeled with stronger terms.

In contrast, the terms "Danger!" and "Warning!" are used for products that are more toxic and indicate a greater risk to health, necessitating more stringent safety measures during handling and application. "Notice!" is not a standard signal word used on pesticide labels and does not convey information about toxicity levels. Therefore, "Caution!" is the appropriate label for slightly toxic pesticides, clearly communicating their risks.