262.470.  Rules and regulations, promulgation. — The director of the department of agriculture shall be and is hereby authorized and directed to make all reasonable and needful rules and regulations for the proper protection to the state in the administration of sections 262.215 to 262.490.  Among other rules and regulations there is hereby delegated authority to examine and investigate at the expense of the fund for the encouragement of agriculture through county and district fairs and certain other agricultural exhibitions to make certain that such county and district fairs and exhibitions are deserving of participation in said fund; said director is further authorized to make needful expenditures from this fund for the proper administration of sections 262.215 to 262.490, including bulletins thereon, and it shall be the duty of said director to make full and complete report in matters relating hereto to the general assembly.  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.