Which Act requires that pesticides be applied according to product labeling?

The Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) is the law that mandates pesticides must be used according to their labeling. This requirement is fundamental for ensuring safety and effectiveness, as the label contains crucial information regarding the proper application methods, dosage, timing, and any safety precautions that need to be adhered to. FIFRA establishes the framework for regulating pesticide registration, distribution, and use, and compliance with labeling instructions is a significant component of that regulation, designed to protect human health and the environment from potential hazards associated with pesticide misuse.

FIFRA’s strict adherence to labeling is necessary to ensure that the pesticides work as intended while minimizing risks to non-target organisms and ecosystems. The other choices, while relevant to pesticide use and regulation, do not specifically focus on the requirement for application according to product labeling, making FIFRA the correct answer. For instance, the FQPA (Food Quality Protection Act) builds upon FIFRA to ensure the safety of food supplies but does not directly establish the labeling requirement itself.