EPA has assessed the risks of diazinon and reached an Interim Reregistration Eligibility Decision (IRED) for this organophosphate (OP) pesticide. Without mitigation, diazinon poses unacceptable risks to agricultural workers and to birds and other wildlife species. To increase protection for workers, birds, and the environment, the Agency's decision includes provisions to phase out and cancel certain agricultural crop uses, the granular formulation, and aerial applications; reduce the amount and frequency of use; and employ engineering controls and other protective measurements. These changes in diazinon use were developed through discussions with the technical registrants and were based on extensive stakeholder input. Diazinon has been one of the most widely used insecticides in the U.S. for household as well as agricultural pest control. A December 2000 agreement with the technical registrants phased out and cancelled all indoor and outdoor residential uses in order to reduce risks to children and others.