Which of the following is NOT a requirement for pesticide labels?

The correct choice identifies that detailed usage instructions are not a mandated requirement on pesticide labels. While it is critical for pesticide labels to provide essential information for safe and effective application, the U.S. Environmental Protection Agency (EPA) specifically requires certain key elements, such as the ingredient statement, registration number, and both the common and chemical names of the active ingredients. These elements are vital for regulatory compliance and ensuring that users can identify the product, understand its contents, and know its approval status.

However, while usage instructions are typically included and certainly helpful for users, the level of detail in those instructions is more variable and may not have the same regulatory weight as the other components mentioned. Labels must guide proper use, but the extent of the detail can differ, which makes it less of a firm requirement in comparison to other labeled items like chemical names or the registration number. This distinction highlights the flexibility in how usage instructions can be presented, ensuring that the core information remains accessible while allowing manufacturers some leeway in language and format.