Rule 4.5.201 - DESIGNATION OF NOXIOUS WEEDS(1) The department designates certain exotic plants listed in these rules as statewide noxious weeds under the County Weed Control Act 7-22-2101(5), MCA. All counties must implement management standards for these noxious weeds consistent with weed management criteria developed under 7-22-2109(2)(b), MCA of the Act.NEW, 1986 MAR p. 337, Eff. 3/14/86; AMD, 1991 MAR p. 511, Eff. 4/26/91; AMD, 2008 MAR p. 563, Eff. 3/28/08.7-22-2101, MCA; IMP, 7-22-2101, MCA;