In order to promote, protect, further and develop the agricultural industry of this state the State Department of Agriculture may adopt by rule official standards for grading and classifying any or all horticultural and agricultural products and official standards for containers of such products and may change any of such grades and standards from time to time. The grades and standards adopted by the department shall be in conformance to any and all laws of this state providing special grades or standards for any of such products or containers. With respect to canned goods, the department is empowered to adopt only definitions and standards of identity, quality and fill of containers. Unless modified, altered or revoked, grades and standards in force on February 2, 1939, shall continue to be official as though adopted under ORS § 632.900 to 632.940 and 632.955 to 632.980. [Formerly 616.410; 1979 c.91 § 3]