What can be defined as a supplemental label for pesticides?

A supplemental label for pesticides is a printed material that provides additional instructions or information about the safe and effective use of a pesticide that may not be included on the main product label. This can include specific directions for use, safety information, or application details that are pertinent to certain situations or locales.

In this context, a pamphlet with directions attached to the container serves as a supplemental label because it extends the information available to users beyond what is outlined on the primary label. This additional documentation can be crucial for ensuring that users apply pesticides correctly and in compliance with regulatory requirements.

The other options do not adequately fulfill the definition of a supplemental label. While a notice posted at retail locations, an online guideline document, or a sticker on the pesticide package could provide useful information, they do not constitute the formal supplemental labeling that is typically found in printed form with detailed instructions for users in the field.