Which act is responsible for regulating new pesticides and their use?

The regulation of new pesticides and their use falls under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). FIFRA establishes a framework for the registration, distribution, sale, and use of pesticides in the United States. Specifically, it requires that pesticides be registered with the Environmental Protection Agency (EPA) before they can be sold or used. This act aims to ensure that pesticides do not pose unreasonable risks to human health or the environment, mandating that manufacturers provide scientific data to demonstrate safety and efficacy.

Other entities mentioned have different roles: the EPA administrates FIFRA but does not exclusively regulate pesticides; the Florida Department of Agriculture and Consumer Services (FDACS) manages pesticide use and regulations at the state level, but it operates under guidelines set forth by FIFRA; and the Occupational Safety and Health Administration (OSHA) focuses on worker safety and health standards, not specifically on pesticide registration or regulation.

Thus, FIFRA is the key legislation addressing the control and regulation of pesticides, making it the correct answer to the question.