2018—Subsec. (a). Pub. L. 115–334 inserted “or asexually” after “sexually” in introductory provisions.
1994—Subsec. (a). Pub. L. 103–349 inserted “or tubers or parts of tubers” after “plant material” and substituted “if the Secretary determines” for “if he determines” in introductory provisions, and added par. (4).
1980—Subsec. (a)(3). Pub. L. 96–574 substituted provisions respecting prohibitions for use of phrases “Unauthorized Propagation Prohibited” and “Unauthorized Seed Multiplication Prohibited” for provisions respecting prohibitions for use of phrase “propagation prohibited”.
Amendment by Pub. L. 103–349 effective 180 days after