Section R. 285.623.302 - IsolationRule 302.
(1) A field that is used for the production of certified seed shall be in compliance with the minimum specified isolation distances from fields of any other variety of the same species or closely related species, unless the field is used to produce seed of the same variety and generation and is certified. A field that produces seed of the same variety, but of a different generation, shall be isolated by a distance of 25.0% of the specified distance between varieties. This standard is to apply to all turfgrass crops unless otherwise noted in the specific crop standards. An adequate distance between seed crops shall be maintained to prevent mechanical mixture.(2) If a bluegrass variety is less than 80.0% apomictic, then a 900-foot isolation distance from other varieties is required if a field is used to produce foundation seed and a 165-foot isolation distance is required if a field is used to produce seed of a certified class.(3) An isolation strip may be used for any of the following purposes:(a) To produce a crop of another species.(b) To grow the same species, but the strip shall be cut to prevent seed production.(c) To grow the same species, but seed from the isolation strip shall be harvested separately and conditioned as uncertified. Reinspections in the field and warehouse will be made to insure that this identity is maintained.(4) For a certified class of grass seed only, varieties that are 95.0% or more apomictic, as defined by the originating breeder, shall have the isolation distance reduced to a mechanical separation only.Mich. Admin. Code R. 285.623.302