Which of the following information about a pesticide-treated field is not required to be displayed at a central location?

The requirement to display certain information at a central location after pesticide application is primarily focused on ensuring safety and compliance with regulations. This includes details that inform workers and others in the vicinity about the specific pesticides used, their potential hazards, and safety measures to take.

The information related to the time and date of pesticide application, the Restricted Entry Interval (REI), and the product details such as name, EPA registration number, and active ingredients are crucial for workers to understand when they can safely re-enter the treated area and for regulatory purposes. These pieces of information help ensure that all safety protocols are followed and that everyone is aware of the treatment details.

In contrast, while knowing the identity of the person who made the application may be useful in some contexts for accountability or record-keeping, it is not typically deemed essential information for immediate safety or compliance in the context of pesticide-treated fields. Thus, this piece of information is not required to be displayed at a central location.