Which component is NOT included in the primary display on a pesticide label?

The primary display on a pesticide label contains essential information needed for safe and effective use of the product. This includes precautionary statements, which inform users about safety measures to take while handling and applying the pesticide; directions for use, which provide guidance on how to properly apply the product; and the registration number, which indicates that the pesticide has been approved for sale and use within the jurisdiction, affirming its legal status.

In contrast, the site of action grouping and identification symbol, while important for understanding how the pesticide works, is not considered a primary display component. This information is typically included in the more detailed sections of the label, aimed at informing users about the specific biochemical mechanisms involved in targeting pest organisms. Thus, it serves a secondary or supplementary role, rather than being part of the essential information presented on the front label that is critical for immediate understanding and safe application by users.