All apples which are sold, offered or exposed for sale in Missouri shall be plainly and conspicuously marked with a sign bearing the name of the variety, the minimum size and the grade, and each package of apples which is sold, offered, exposed, or packaged for sale by a grower or packer shall, in addition, be plainly and conspicuously marked with the name and address of the grower or packer. The director shall exempt from the provisions of this section apples which are marked with, and meet the requirements of, grades of the United States Department of Agriculture or well established grades promulgated by other states; provided, that such apples are otherwise marked in accordance with the provisions of this section. Any person violating any of the provisions of this section shall be deemed guilty of a misdemeanor. In addition, any apples found to be offered or exposed for sale in violation of this section may be ordered temporarily withdrawn from sale by the director, pending either informal adjustment according to law between the director or his duly authorized representative, and the person in charge of the apples in question, or the filing of a formal complaint, without undue delay, with the attorney general or prosecuting attorney.