What does the registration number of a pesticide identify?

The registration number of a pesticide is a unique identifier assigned by regulatory agencies, such as the Environmental Protection Agency (EPA) in the United States, that provides specific information about the pesticide's manufacturer or registrant and its formulation type. This number is crucial for regulatory compliance, allowing users and authorities to trace the product back to its source, ensuring that the pesticide has been evaluated for safety and effectiveness before it reaches the market. Additionally, it helps in identifying the formulation used (e.g., liquid, granular) which is important for understanding application guidelines and safety measures.

The other choices do not accurately reflect the purpose of the registration number. While the expiration date is important for product efficacy and safety, it is not identified by the registration number. Similarly, the registration number does not denote the specific target pests or the safety rating of the pesticide, which are determined by other classifications and labeling requirements.