The terms used in seed testing and the methods of sampling, inspecting, analyzing, testing and examining agriculture, vegetable, flower, tree and shrub seeds, and lawn and turf mixtures and the tolerance allowed thereof shall be those adopted by the Association of Official Seed Analysts (AOSA), effective October 1, 1981, as amended, except that tolerance will not be allowed for prohibited noxious weed seeds. A copy of the rules may be obtained from the current Secretary-Treasurer AOSA or at www.aosaseed.com.
7 Pa. Code § 111.1