Most growers are required to service their fields with pesticides, especially since the advent of the olive fruit fly. Permits for the use of controlled pesticides are supplied by each state’s Agriculture Commission. In California, you can determine which county office regulates your orchard.
Your pesticide supplier can also direct you to the appropriate office since they are required to maintain customer information about sales of controlled pesticides.
If you are a domestic organic grower, the first area of regulations will be maintenance of the orchard under rules set forth by the USDA National Organic Program.
In California, the Certified Organic Farmer Association (CCOF) can supply complete information about how to qualify as an organic farmer and maintain your crop under organic regulations.