The board shall require pesticide dealers, commercial applicators, and public applicators to maintain records of sales and purchases of restricted use and special exemption pesticides. The board shall require commercial applicators and public applicators to maintain records of all applications of pesticides. The board may require restricted use pesticide application records of private applicators. The records must be kept for a period of three years from the date of the application, sale, or purchase of the pesticide. Upon request, all or any requested part of these records must be submitted to the commissioner.