Mich. Comp. Laws § 286.101

Sec. 1. For the purposes of this act the following words, names and terms shall be construed respectively to mean: (a) Commissioner: The commissioner of agriculture. (b) Cultivated black currants: Plants, roots, cuttings or scions of Ribes nigrum L. (c) Currants and gooseberries: Plants, roots, cuttings or scions belonging to the genera Ribes L. and Grossularia (Tourn.) Mill. (d) White pine blister rust control area: An area established by state authority, wherein the planting and possession of currant and gooseberry plants is prohibited for the purpose of protecting the white pines on such area from damage by white pine blister rust. (e) Fruiting currant and gooseberry control area: An area established by state authority wherein the planting or possession of white pines is prohibited for the purpose of protecting fruiting currants and gooseberries in such areas from damage by the white pine blister rust. (f) White pine: Plants of any species belonging to the genus Pinus which bear their needles in clusters of 5. (g) White pine blister rust: The fungous disease caused by Cronartium ribicola Fischer.