Upon satisfactory evidence presented to the Secretary or the Director of the Department of Pesticide Regulation that the commissioner of any county is guilty of neglect of duty, incompetence, or misconduct in office, the trial board that is selected, pursuant to this article, shall hold a hearing at the time and place specified by the trial board. The secretary shall convene the trial board when the alleged offenses come under the jurisdiction of the Department of Food and Agriculture, and the director shall convene the trial board when the alleged offenses come under the jurisdiction of the Department of Pesticide Regulation.