Every manufacturer of frozen desserts produced for sale shall, during the month of May in each year, file with the Department of Agriculture an application for a license upon a form prescribed by the Department. The application must show that the frozen desserts manufactured by the applicant are composed of pure and wholesome ingredients and are produced under sanitary conditions. The application shall also show the location of each plant at which frozen desserts are to be manufactured and the name of the brand or brands, if any, under which they are to be sold. The license period shall be for twelve months beginning June first.