Mich. Comp. Laws § 286.104: Cultivated black currant declared public nuisance; destruction.

Sec. 4.

The cultivated black currant is hereby declared a public nuisance. Planting, possessing, growing, propagating, selling or offering for sale plants, roots, or cuttings of cultivated black currants within the state is hereby prohibited. Such roots, cuttings or plants now planted or growing may be destroyed by the commissioner or his agents.