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A history of the listing of pesticides as restricted materials in California

California is well-known as a leader in the area of pesticide regulation. Many mechanisms now present at the national level began in California. The concept of restricted use pesticide is an example of this trend. This paper traces the history of restricted materials in California and identifies milestones in the program as well as specific designations to, and deletions from, the list. This report documents, in one place, the order and basis of early actions to place pesticides on the restricted materials list.