Mo. Rev. Stat. § 265.020

In order to promote, protect, further, and develop the agricultural interests of this state the director is hereby authorized and empowered after investigation and public hearing to fix and promulgate rules for grading and classifying any or all agricultural products grown or produced in this state and to fix and promulgate rules for containers of farm products and change any of them from time to time. No rule or portion of a rule promulgated under the authority of this chapter shall become effective unless it has been promulgated pursuant to the provisions of section 536.024.