Which of the following is a warning used on labels of slightly toxic pesticides?

The term "Caution" is specifically used on labels of slightly toxic pesticides to indicate the level of toxicity. In pesticide labeling, it serves as a warning sign that the product has low toxicity to humans and animals, but precautions should still be taken while handling it. This allows users to differentiate between the toxicity levels of various products.

Labels generally use a specific hierarchy for toxicity:

• "Danger" indicates highly toxic substances,

• "Warning" applies to moderately toxic substances, and

• "Caution" is reserved for those that are slightly toxic.

The use of "Caution" helps inform handlers to be vigilant while using the product, even though it is less hazardous compared to those that fall under "Warning" or "Danger."