Michigan Compiled Laws, Chapter 286. Agricultural Industry § 286.403

Sec. 3. If the director determines that the petition is properly filed, he shall hold a public hearing after giving at least 10 days' notice of the time and place at which the hearing will be held by posting in at least 5 of the most public places within the affected area, and by notice by mail to each of the petitioners and to each manufacturer, supplier and dealer furnishing the chemical substance complained of within the affected area, so far as is known to the director, after diligent inquiry. Proof of notice shall be evidenced by affidavit of the director appended to the minutes of the hearing at which the petition is considered.