Refers to an action taken under Section 6(b) of the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA) to cancel a pesticide registration for one or more specific uses when the Environmental Protection Agency finds the use results in unreasonable adverse effects to the environment or public health when a product is used according to widespread and commonly recognized practice, or if its labeling or other material required to be submitted does not comply with FIFRA provisions.